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In the news
- NHGRI Genetic Discrimination Fact Sheet
- Genetics Home Reference guide to the Genetic Information Nondiscrimination Act
The final regulations relating to the US Genetic Information Nondiscrimination Act (GINA) on employment have been published, and will come into effect in January 2011.
The GINA (see previous news) prohibits discrimination on the basis of genetic information in the areas of insurance (including health insurance) and employment. Now the Equal Employment Opportunity Commission has released final regulations clarifying the precise provisions of the Act with respect to employment, taking effect from 10th January 2011. Broadly, employers are not permitted to request or demand genetic data from current or prospective employees, or to use in employment decisions or make public genetic information, or to take action against an employee who uses the GINA legislation to object to or block requests or actions by the employer.
The Department of Health and Human Services is reportedly also preparing a similar clarification with respect to genetic information and health insurance.
- UK Genetic Testing Network (UKGTN)
- Evaluation of Genomic Applications in Practice and Prevention (EGAPP)
- Gene Tests medical genetics information
PLoS Currents is an open-access publication forum for very fast dissemination of new research, intended to reduce the traditionally very lengthy process of submission, peer review and publication to the absolute minimum. The advantage of this initiative is to allow rapid sharing of research findings with appropriate scrutiny and review from relevant experts, whilst ensuring that the work is citable, archived in PubMed Central, and searchable in PubMed.
PLoS Currents: Evidence on Genomic Tests provides reviews and summaries on the validity and utility of genomic tests and applications, and aims to highlight gaps in current knowledge. This is a very valuable endeavour since this sort of information has no central repository and can be surprisingly difficult to access. Genomic is used in the broadest sense, encompassing various forms of related diagnostics and applications such as proteomic tests.
PHG Foundation Director Dr Hilary Burton recently joined the editorial board for PLoS Currents: Evidence on Genomic Tests, joining editorsDavid Dotson and Muin Khoury of the Centers for Disease Control and Prevention in Atlanta, US and Katrina Goddard of the Kaiser Permanente Center for Health Research, Portland, US.
Dr Burton commented: “Evidence (most notably on the utility of genomic tests) can be difficult to gather, particularly in the context of rare disorders, where traditional large epidemiological studies are impossible. I hope that this venture will provide a valuable way of sharing evidence from experts around the world and building up our body of knowledge in order to improve population health. I am delighted to be joining this exciting enterprise, and look forward to bringing in the wealth of experience from our colleagues in the UK”.
Plans to create the first Danish stem cell centre have been set out by the Danish Council for Strategic Research and the Novo Nordisk Foundation.
The planned new Danish Stem Cell Center, DanStem, will be based at the University of Copenhagen and will open from 2011, focusing on basic and applied stem cell research for diabetes and cancer therapeutics. The Danish Council for Strategic Research has provided DKK 65 million (€8.7 million) funding over five years, while the private Novo Nordisk Foundation has contributed an additional DKK 350 million (€47 million) over ten years for basic research. DKK 30 million has reportedly been allocated ‘to support national collaboration in order to ensure synergy with stem cell research at other Danish universities'.
Private co-financing was apparently agreed to be essential for this new venture and certainly, the input from Novo Nordisk dwarfs that from the Danish government. The success of this heavily commercially-subsidised model will be watched with interest by other countries considering how best to fund future research in stem cells and regenerative medicine. One key issue will no doubt be ownership of IP on potential new tools and therapeutics.
- Technology Strategy Board (TSB)
- Royal College of Midwives
- Royal College of Obstetricians and Gynaecologists
The first ever stroke patient to receive neural stem cell therapy has been treated in a Glasgow hospital.
This marks the beginning of the first clinical trial of its kind for stroke patients. The patient, described as ‘an elderly man’, has received an initial very low dose with the aim of assessing safety. If his progress is found to be satisfactory when reviewed in December, the rest of the cohort of up to 12 patients will be treated shortly afterwards with progressively higher doses over the coming year. All of the patients are men over 60 with stroke disability who have shown no improvement in their condition over a number of years: This is in order that reactions to the treatment can be compared across patients who have similar profiles, and to reduce the likelihood that any observed improvement is due to spontaneous partial recovery. If the results of these trials are promising, then larger trials on more diverse groups of patients will be the next step.
Stroke is the third largest cause of death, and the single largest cause of disability in the developed world, and currently has no effective treatments following the acute phase of the first few hours. The trial is being carried out with the company ReNeuron Group, who claim that pre-clinical testing has indicated that the treatment is capable of reversing functional deficits associated with stroke disability. If this proves to be the case in this trial, then the impact could be enormous: in the UK stroke patients are estimated to occupy more than 25% of long term hospital beds and to present an annual cost in excess of £5 billion. The results from this trial will take some time to be known though; this initial phase is largely to test safety, and the efficacy phase with more diverse patients won’t take place for at least another two years.
- My very own medicine: what must I know? Information policy for pharmacogenetics
- ESRC Genomics Policy and Research Forum
- NHS Information Policy Unit
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- What is epigenetics?
- Obesity (UK Department of Health)
- Climb National Information Centre for Metabolic Diseases
The US National Human Genome Research Institute (NHGRI) has announced plans to divert DNA sequencing research funding towards projects focusing on health applications.
NHGRI is the major publicly-funded human genome research body in the US, funding three sequencing centres. Plans announced at the recent annual meeting of the American Society of Human Genetics reveal that funding to these large-scale sequencing centres will be reduced as three new funding areas are established. These will be an initiative to identify and catalogue the mutations that cause rare genetic diseases; projects that will use DNA sequence data to direct patient management (see previous news for examples); and efforts to develop robust, general bioinformatics tools for analysing sequence data.
Although funding for basic sequencing research remains important, these moves to invest smaller amounts in preparing the way for the actual clinical benefits of human genome sequencing are vital. In the UK, the PHG Foundation is taking a similar approach, but looking at the wider barriers and drivers for application of whole genome sequencing for medical purposes, including logistic, economic, ethical, legal, social and regulatory considerations.
- What is epigenetics?
- Obesity (UK Department of Health)
- Climb National Information Centre for Metabolic Diseases
Germany's national academy of sciences Leopoldina has published a new report on predictive genetic testing.
Predictive genetic diagnostics as an instrument of disease prevention is the output from a working group of experts from Leopoldina, the Berlin-Brandenburg Academy of Sciences and Humanities and the German Academy of Science and Engineering Acatech. It considers not only medical but also ethical, economic and legal issues related to predictive genetic testing of healthy individuals, and sets out a range of recommendations.
There is an express rejection of eugenic principles such as ‘wanting to eliminate certain genes from all individual genomes of a population’. Recommendations include planning for the wider uptake of genetic testing within health services for patients with or at risk of ‘genetically determined and essentially treatable diseases’, including production of evidence relating to effectiveness and cost-effectiveness, development of medical guidelines for predictive genetic diagnostics, training for medical professionals, and expansion of newborn screening programmes. The report also calls for more basic and translational research into genetic contributions to complex diseases, and societal education about the ‘possibilities and limits of genetic medicine’, especially in schools.
Perhaps the most significant recommendations relate to a new German law on genetic testing (the Gendiagnostikgesetz) intended to protect against abuse of genetic information, which stipulates that the results of genetic testing and analysis should be expunged from medical records after ten years. Conversely, the report says that there should not be a set deadline, and that data should be stored for longer as it may be relevant to the future health of the patient or family members. Similarly, the report calls for amendment of the law’s definition of newborn screening as universal genetic screening, since this means that only doctors (not nurses or midwives) can obtain parental permission for testing, a situation thought not to be in the best interests of the newborns since it limits uptake (see press release).
In other respects the recommendations are highly conservative, calling for a ban on direct-to-consumer (DTC) services on that grounds that such tests ‘do not fulfil the requirements of medical and ethically acceptable predictive genetic diagnostics’ due to a questionable scientific basis and the lack of associated formal genetic counselling – despite the fact that this sort of counselling is not really required for tests with very low predictive ability such as those for common diseases. They also propose that genetic investigation of healthy individuals with no family history of serious disease should be confined to the research setting until the ethical and social implications have been more fully investigated.
Comment: In seeking to ensure that the benefits of genetic testing for individuals and families with serious inherited forms of disease are not limited, the report is a very positive step for German health policy. Vehement rejection of genetic testing for other situations may in some ways also be beneficial, in focusing attention on those with significant medical needs. However, in other respects it could be an over-reaction to perceived harms that are, in reality, highly improbable.
Lung cancer tumours in smokers have different mutations to those in non-smokers, it has been reported, suggesting that the disease may be fundamentally different between the two groups.
The findings were those of a pilot study presented at the 9th Annual Frontiers in Cancer Prevention Research Conference of the American Association for Cancer Research (AACR) earlier this week. The AACR press release reports that the researchers looked at both tumours and healthy tissue from 30 patients who had never smoked, and from 53 current or ex-smokers, and found that the never-smoker tumour genomes contained twice as many genome alterations as those of smokers and were of distinctly different types. One of the researchers, Kelsie Thu, has said that these results suggest that the never-smoker tumours develop through different routes, could be more genomically unstable, and should perhaps be studied as a separate group.
These reported results are interesting, but it should be noted that the sample sizes in the study are relatively small, that the precise methods used and detailed results haven’t been disclosed, and that the work has not yet been either peer-reviewed or published. If however the reported findings are borne out by further and larger study, a more finely detailed understanding of the underlying biology of lung cancer in different patient groups could, as the researchers suggest, lead to improved detection rates and new and more specific therapeutic approaches for the cancer that has both the highest incidence and mortality rate in the UK and worldwide.
- Canadian Institutes of Health Research
- Genomics Institute of the Novartis Research Foundation
- Human Variome Project
The UK Open Access Implementation Group has resolved to take action in order to increase take-up of open access publishing amongst UK researchers.
The group - currently consisting of ten leading organisations from research and academia, including Universities, the UK Research Councils and the Wellcome Trust – concluded in a meeting at the Wellcome Trust that a persuasive summary of the key advantages of open access is needed. They intend to “coordinate evidence, policies, systems, advice and guidance, to make open access an easy choice for authors”.
Open access refers to a publishing model whereby anyone can freely view the results of scientific research without requiring a subscription to the journal. Rather than readers paying to view the article, open access is usually funded by the author of the article paying to publish. Despite it being the stated policy of the UK Research Councils that all publicly funded research should be published in this manner, and provision for the publication fees being calculated into research grants, some scientists are reluctant to publish in open access journals because they feel that these lack the prestige and impact of the top traditional journals. The Implementation Group say that the evidence shows that open access is beneficial to all parties, and that they must now develop a practical plan make those benefits evident to researchers.
A new survey from the Genetics and Public Policy Centre at Johns Hopkins University has found that customers of direct-to-consumer (DTC) genetic testing companies are generally satisfied.
Researchers sought to understand the motivations, attitudes, responses and understanding of customers to further inform ongoing debate about the regulation of DTC genetic testing companies (see previous news). A random sample of 1,048 US customers of the three major companies offering personal genomics DTC (23andMe, deCODEme and Navigenics) were surveyed online between June 2009 and March 2010.
Early adopters of DTC genetic tests (who tend to be affluent and well educated) indicated that they were generally satisfied with the testing services. The top reason cited for pursuing testing was curiosity (94%), though 77% also pursued testing to help improve their health. Interestingly, 58% said they learned information that would help improve their health, and as a result of testing, 34% said they were being more careful about their diet and 14% were exercising more.
Despite the complexity of the information, and fears that people would be unable to understand their results, 88% of customers reported that their risk results were easy to understand, and only around 5% misinterpreted two example risk reports presented in the survey. Regarding regulation, around two-thirds of participants felt that such tests should be available without government oversight, although consumer protection agencies (such as the Federal Trade Commission in the US) should monitor companies’ claims for scientific accuracy.
This study provides long-overdue evidence that consumers are satisfied with DTC genetic testing services, and are generally able to interpret their results. It also indicates that there may be direct health benefits resulting from the tests in terms of behaviour modification.
Although long term follow-up is needed to investigate whether the behavioural changes cited are permanent or transitory, this survey indicates not only the absence of harm caused by DTC genetic testing services, but also the possibility of benefits. While it is unclear whether the results from these early adopters are broadly applicable to the general public, nonetheless the findings of this study concord with the PHG Foundation’s own recommendations regarding the regulation of DTC genetic services (see previous news).
The first large-scale Arab population biobank is to be set up in Qatar, for research into common local diseases, notably diabetes, cardiovascular diseases and cancer.
The Qatar Foundation for Education, Science, and Community Development and Qatar's Supreme Council of Health have announced that the new Qatar Biobank is to be established with expert assistance from Imperial College, London. It will collate biological samples and linked medical and lifestyle data from up to 100,000 participants and follow their long-term health outcomes to facilitate research into genetic and environmental causes of major diseases. The new biobank will be the largest population-based study of this kind in an Arabic country, recruiting Qatari and south-east Asian participants, and it is hoped that the data will form a valuable contribution to international biobanking efforts. An initial pilot phase will recruit 2000 participants, with plans to increase to 100,000 over six years.
Dr Hanan Al Kuwari, Chair of the Qatar Biobank Steering Committee said that the facility would work closely with the government to identify health targets or areas for further investment, adding “This will enable Qatar not only to practice evidence based medicine but also evidence based public health".
- Unites States Patent and Trademark Office
- GeneReviews BRCA1 and BRCA2 Hereditary Breast/Ovarian Cancer
The US federal government has said that patents should not be granted for genomic DNA (human or otherwise), on the basis that it is a product of nature, even when isolated from the body.
The ground-breaking assertion reverses the previous situation whereby government bodies (along with everyone else) actively filed DNA patents wherever possible. It forms part of an amicus brief responding to the ongoing legal battle over US patents for the BRCA 1 and BRCA2 genes (see previous news), in which the US Justice Department supports the patentability of modified but not merely isolated DNA sequences. However, the US Patent and Trademark Office said it will be continuing to consider applications for gene-related patents as before.
Critics fear that restricting the scope of gene patents will have a detrimental effect on biomedical development by limiting potential financial returns on investment in research. Others contend this is unlikely because the manipulation of genes (for example, to create novel gene therapies or biosynthetic organisms) would still be patentable. Commercial incentives for some applications such as diagnostic testing would certainly be restricted – many would argue, appropriately – to the precise testing method, and not to the DNA being analysed.
Research articles
| Study: | Genome-wide meta-analysis increases to 71 the number of confirmed Crohn's disease susceptibility loci |
| By: | et al. (96 authors total) |
| In: | Nature Genetics |
| Link: | http://dx.doi.org/10.1038/ng.717 |
With 32 known Crohn’s susceptibility loci in 2008, this consortium set out to identify additional disease susceptibility loci.
The consortium meta-analysed data from six previous Crohn’s disease genome-wide association studies involving over 6,000 cases and 15,000 controls. Promising results were followed up in a further 15,000 cases and 14,000 controls as well as over 400 parent-child trios. Additional analyses were conducted in order to identify candidate genes in the novel susceptibility regions.
Promising findings from the meta-analysis of the published GWAS were followed up in additional cases and controls leading to the identification of 39 susceptibility loci of which 30 were new. 17 biologically interesting genes were identified and have been highlighted for further follow up. The 32 previously identified susceptibility loci were also confirmed.
This current study has doubled the number of Crohn’s disease susceptibility loci with many potential casual genes identified for additional functional studies. These additional susceptibility loci increase the explained genetic heritability from 20 percent to 23.2 percent. Further work is already underway and promises to further elucidate the pathogenic mechanism of Crohn’s.
The authors note that because tagging SNPs act as imperfect proxies for causal SNPs with true disease risk being underestimated, this in turn leads to the proportion of heritability explained also being vastly underestimated. It will be interesting to see how this will be overcome by using new rapid sequencing techniques to aid the understanding of disease genetic aetiology.
- Obesity (UK Department of Health)
- Climb National Information Centre for Metabolic Diseases
- Wellcome Trust Sanger Institute
| Study: | Cystic fibrosis testing 8 years on: Lessons learned from carrier screening and sequencing analysis |
| By: | et al. (10 authors total) |
| In: | Genetics in Medicine |
| Link: | http://dx.doi.org/10.1097/GIM.0b013e3181fa24c4 |
Review data from 2002-09 on the cystic fibrosis (CF) carrier and diagnostic testing offered by Quest Diagnostics in California, in order to evaluate the performance of a panel of 23 mutations recommended by the American College of Medical Genetics (ACMG) and American College of Obstetricians and Gynaecologists (ACOG).
Using a databases containing over 3 million CF screening tests with a mutation panel of 23-32 mutations, and nearly 4000 sequencing analyses of the CFTR gene, the authors observed a carrier rate of 1:34 with a detection rate of 85% (and almost 100% in Caucasians) based on the estimated US pan-ethnic carrier rate of 1:29.
Limiting the carrier mutations detected to just the ACMG/ACOG core panel would have reduced the detection rate by only 1%. The authors estimate that around 1 in 1149 couples would be identified as at risk for conceiving a child with CF using this panel, of whom around two-thirds would opt for prenatal diagnostic testing. Of 62 newborns with CF, the majority (64%) were compound heterozygotes of one panel mutation and a mutation not on any panel.
There is no evidence that including additional rarer mutations in the panel would substantially improve the carrier detection rate. Furthermore, because 27% of individuals diagnosed with atypical or mild CF in this study had only a single CFTR mutation, no current molecular method alone is capable of detecting all newborns with CF.
This large study indicates that CF carrier testing based on a limited number of the most common mutations performs well even in an ethnically diverse population. The finding has implications not only for the design of national screening programmes but also for the various commercial companies offering CF carrier testing based on many more mutations, including the leading consumer genomics company 23andMe which has recently substantially expanded its genotyping platform (see Genetic Future).
| Study: | A de novo paradigm for mental retardation |
| By: | et al. (15 authors total) |
| In: | Nature Genetics |
| Link: | http://dx.doi.org/10.1038/ng.712 |
Investigate the genetic basis for unexplained mental retardation, caused by de novo mutations in children with a normal karyotype and array-based genome profiling.
Whole exome sequencing was performed on 10 children with unexplained mental retardation and their parents. On average, nearly 22,000 genetic variants were found per individual, which were reduced to under 6,000 variants each by exclusion of non-coding and intronic variants as well as those that would have no affect on the resulting protein sequence. This number was further reduced by excluding known and likely benign variants, firstly by comparison with databases such as dbSNP to exclude common variation, and secondly by comparison with the parents genomes to exclude inherited variants. Following this process and validation by Sanger sequencing, just 9 candidate causal mutations remained which were assessed for their likely biological function.
After an exhaustive bioinformatics analysis pipeline following exome sequencing, 6 variants were identified in 6 individual children that are likely to be pathogenic based on gene function, evolutionary conservation and likely mutational impact.
These findings provide strong experimental support for the importance of novel genetic variants arising de novo in the aetiology of severe mental retardation.
This clearly written study not only expands the genetic causes of mental retardation in children from de novo copy number variants to include de novo point mutations, but also provides an excellent example of the application of whole exome sequencing to a long standing clinical problem. The analysis pipeline described has implications for both preventative and diagnostic strategies in diseases with a strong heritable component, and is likely to be increasingly fruitful as more comprehensive databases of genomic variation and functional assays are developed.
- Obesity (UK Department of Health)
- Climb National Information Centre for Metabolic Diseases
- Coronary heart disease - NHS Choices
An expert US group has concluded there is insufficient evidence to support genomic profiling for cardiovascular disease (CVD) risk prediction.
The EGAPP (Evaluation of Genomic Applications in Practice and Prevention) Working Group is a US panel that assesses the evidence about new genetic tests and applications (see previous news). Prevention of CVD is a public health priority, and in recent years new genomic and proteomic biomarkers – including those emerging from discoveries of genetic variants through GWAS - have been evaluated for their ability to improve current prediction methods based on traditional risk factors. The latest recommendation statement by EGAPP reviews currently available evidence, concluding that there is “insufficient evidence to recommend testing for the 9p21 genetic variant or 57 other variants in 28 genes to assess risk of CVD in the general population” [EGAPP Working Group, Genet Med. 2010 Oct 29, Epub ahead of print]. The EGAPP group found that the analytic validity of available genomic profiling tests for individual gene variants was potentially satisfactory, where available, but there was inadequate evidence available. Similarly, evidence for clinical validity was inadequate for 59% of the gene variant/disease associations tested. Only the association between the 9p21 variant and risk of heart disease was reasonably strong, but the improvement in risk prediction from testing for this variant was found to be ‘at best, small’. Overall, there was no evidence of health benefit from using such genomic profiling tests singly or in combination, so the group recommended against use in clinical practice unless new evidence of benefit emerges.
CVD is an enormous public health issue.With genomic tests for CVD being available to the population through clinicians as well as direct-to-consumer, there need to be well established recommendations for cardiac risk assessments for both physicians and patients; this is a useful contribution to the confusing picture. A PHG Foundation report released earlier this year, Predicting the risk of coronary heart disease with conventional, genetic and novel molecular biomarkers, similarly concluded that genetic and other biomarkers are in fact ‘unlikely to improve substantially our ability to predict the risk of CHD in individuals’ in the near future. However, risk prediction is a highly complex area, and new work due out soon has been considering the issue of how to reliably assess and compare the impact of risk prediction models, to allow accurate evaluation of how new data – such as genomic profiles – do or do not improve outcomes.
A new Canadian initiative is seeking to promote the importance of science – and particularly publicly funded science – for the public good.
The Professional Institute of the Public Service of Canada, which includes science researchers and policy-makers, has launched Public Science, an online information service ’to underline the importance of science for the public good and to mobilize scientists and the public to press politicians to make a clear commitment to policies that support public science’. Key aims are apparently to showcase the public benefits of scientific endeavour, increase public support for research, and address what is referred to as a ‘worrying trend away from evidence-based policy-making’.
Measures to explain the value and impact of publicly-funded science to the ultimate beneficiaries are an excellent idea, and ultimately could have a positive impact on understanding and support for evidence-based policy decisions – though policy development is of course a highly complex process that must take into account both the scientific evidence and a whole host of other factors besides, economic, social, logistic, political and many more.
| Study: | The Major Genetic Determinants of HIV-1 Control Affect HLA Class I Peptide Presentation |
| By: | |
| In: | Science |
| Link: | http://dx.doi.org/10.1126/science.1195271 |
A huge international consortium examined the genetic factors involved in individual variation in ability to control viral spread following infection by Human Immunodeficiency Virus (HIV).
A small subset of people infected with HIV show the ability to significantly limit viral replication and spread to over a long period in the absence of treatment, preventing progression to clinical AIDS. Researchers performed a genomewide association study (GWAS) on a total of 974 of these HIV-controllers and 2648 HIV-progressors, none of whom had received treatment, from different populations.
Every SNP that showed significant association with HIV control lay within the major histocompatibility complex (MHC) region on chromosome 6, clustered around the class I HLA genes. Analysis suggested that the genetic variants observed in controllers all affected a small number of amino acids in the HLA proteins, involved in presentation of viral proteins to components of the immune system.
The authors conclude that physical interactions between the viral peptides and the host HLA proteins are a key factor in effective control of viral infection by the immune system, and that genetic variation affecting these interactions underlies the major part of human variability in response to HIV infection.
Despite some success in developing therapeutics to control HIV infection, a vaccine remains an urgent health need around the world. Pathological insights provided by genetic analysis such as this could ultimately be pivotal in efforts to devise effective interventions to block or limit HIV infection.
| Study: | A Survey of UK Public Interest in Internet-Based Personal Genome Testing |
| By: | et al. (5 authors total) |
| In: | PLoS One |
| Link: | http://dx.doi.org/10.1371/journal.pone.0013473 |
To explore the reasons why people would consider using commercially available, internet-based Personal Genome Testing (PGT) and how they would use the resulting genetic risk information.
A self-completion questionnaire was completed by 4,050 adult volunteers from the UK-based TwinsUK register, aged 17 to 91. Firstly, subjects were asked if they were aware of such PGT services. Then they were asked to indicate how likely they would be to order such a test if the service cost £250 or was free. Respondents were then asked to what extent they agreed or disagreed with a list of reasons to have a personal genome test.
The level of awareness of the service was low, with only 1 in 8 respondents having heard of the existence of PGT. Only 5% of study participants were potentially interested in PGT at current prices, but this increased to 50% for free tests. 93% said they would take the test to encourage them to adopt a healthier lifestyle if found to be at high genetic risk of a disease. 80% would consider testing to obtain the genetic risk information for their children, and a similar number felt that it would help their doctors to better monitor their health.
The study suggests that increased awareness and lower costs of PGT might lead to a significantly increased interest from the general public, driven mainly by the desire to improve health monitoring and assessment. The results suggest that health professionals will be increasingly required to respond to individuals who have undergone PGT, which has implications for health service providers regarding both cost and time.
Although it gives an interesting picture of current public interest in Personal Genetic Testing, it is only a hypothetical study. At present, it is difficult to precisely assess the future extent of the clinical utility of PGT. It is also important to note that PGT differs from clinical genetic testing as PGT focuses on complex, often unexplored, diseases and traits, resulting in low predictive values. Moreover, the study participants (volunteers from a twin-based cohort) might not reflect the views of the general population.
| Study: | A genome-wide association study of Hodgkin's lymphoma identifies new susceptibility loci at 2p16.1 (REL), 8q24.21 and 10p14 (GATA3). |
| By: | et al. (45 authors total) |
| In: | Nature Genetics |
| Link: | http://dx.doi.org/10.1038/ng.696 |
To identify genetic loci associated with susceptibility to classical Hodgkin's lymphoma (cHL).
The researchers performed a two-stage genome-wide association study (GWAS) comparing around 500,000 SNPs in 589 patients with cHL and 5,199 controls. Initial findings were then followed-up in an additional 524 cases and 1,533 controls with further replication work in 1,533 cases and 1,883 controls from three independent studies.
The study confirmed the role of the immune system in susceptibility to cHL, with several associations noted within the HLA region on chromosome 6. Three novel associations on chromosomes 2, 8, and 10 were also identified following a combined analysis of all data including the replication studies, implicating the REL and GATA3 genes on chromosomes 2 and 10. The region of interest on chromosome 8 contains several genes previously linked with other cancers such as those of the prostate and breast.
The authors conclude that there is a sound biological basis for association between all the genetic regions implicated in their study and risk of cHL. This includes evidence for a relationship between the three novel regions, although the authors were only able to detect nominal interactions between the HLA region and chromosome 2 regions, and between chromosomes 8 and 10. They also acknowledge that “further studies are needed to investigate possible interactions between these susceptibility loci and their interplay with EBV [Epstein Barr virus] infection” and state that “the modest size of our study makes it likely that further risk variants for cHL can be identified through additional studies.”
Despite being limited in size, this study has identified several very biologically interesting susceptibility loci and new insights on the genetic basis of Hodgkin's lymphoma. Although the Epstein Barr virus infection may be causally related to some cases of cHL, the etiology of EBV-negative cases is still largely unknown despite extensive research. The findings on chromosomes 2, 6, and 8 in this study were further enriched in EBV-negative cases, which suggests that these regions may be involved in disease etiology via a different pathway from that followed by EBV infection. This could lead to exciting follow-up work.
| Study: | Sigma nonopioid intracellular receptor 1 mutations cause frontotemporal lobar degeneration - motor neuron disease |
| By: | et al. (19 authors total) |
| In: | Annals of Neurology |
| Link: | http://dx.doi.org/10.1002/ana.22274 |
Researchers looked for new mutations in selected candidate genes that might account for an inherited form of early-onset dementia.
Frontotemporal lobar degeneration (FTLD) is the most common cause of early-onset dementia and the third most common form of dementia (after Alzheimer's disease and dementia with Lewy bodies). A large family with an inherited form of FTLD with no mutations in genes previously linked to dementia were examined for mutations in other candidate genes, and for the biological effects of these presumed mutations.
The researchers found a mutation in the Sigma nonopioid intracellular receptor 1 (SIGMAR1) gene in affected individuals. This was shown to cause increased expression of the Sigma-1 protein in the brain, which in turn altered the distribution of other proteins observed in brain lesions characteristic of this form of dementia and of motor neuron disease (MND). This was modified on treatment with ligands of the Sigma-1 receptor.
The authors conclude that mutations in the SIGMAR1 can cause a form of familial FTLD-MND, although they say it is not possible to say that this the main genetic locus associated with the more common, non-familial forms of these neurological disorders. However, they also note that drugs that target the Sigma-1 receptor might be effective as treatments for these conditions.
Drugs directed against the Sigma-1 receptor already exist and are used for the treatment of various psychiatric disorders. Researchers are reportedly testing them in mice to see whether they have any effect on the development of brain lesions associated with dementia or motor neuron disease. If they did - and this remains a big if for now - then clinical trials in humans to assess whether they would be effective in delaying the progression of forms of dementia and MND could potentially proceed quite rapidly.
New reviews and commentaries
Realising the benefits of genetics for health.
Wright CF, Brice P, Stewart A, Burton H. Lancet. 2010 Oct 23;376(9750):1370-1.
Regulating direct-to-consumer personal genome testing.
McGuire AL et al. Science. 2010 Oct 8;330(6001):181-2.
Regulating direct-to-consumer genetic tests: What is all the fuss about?
Wright CF, Hall A, Zimmern RL.Genet Med. 2010 Oct 1. [Epub ahead of print]
Being more realistic about the public health impact of genomic medicine
Hall WD, Mathews R, Morley KI (2010) PLoS Med 7(10): e1000347.
The ethics of direct-to-consumer genetic testing.
Udesky L. Lancet. 2010 Oct 23;376(9750):1377-8.
Ancestry and disease in the age of genomic medicine
Rotimi CN, Jorde LB. N Engl J Med. 2010 Oct 14;363(16):1551-8.
Human genome: Genomes by the thousand
Nature. 2010 Oct 28;467(7319):1026-7
Genomics: In search of rare human variants
Nielsen R. Nature. 2010 Oct 28;467(7319):1050-1.
Genomics: The search for association.
Baker M. Nature. 2010 Oct 28;467(7319):1135-8.
Epigenetic modifications and human disease.
Portela A, Esteller M. Nat Biotechnol. 2010 Oct;28(10):1057-68.
Stress and the epigenetic landscape: a link to the pathobiology of human diseases?
Johnstone SE, Baylin SB. Nat Rev Genet. 2010 Nov;11(11):806-12
Misleading communication of risk
Gigerenzer G, Wegwarth O, Feufel M. BMJ. 2010 Oct 12;341:c4830.
Genetics and genomics in general practice.
Liaw ST. Aust Fam Physician. 2010 Sep;39(9):689-91.
Illuminating the potential of pluripotent stem cells.
Rosenzweig A. N Engl J Med. 2010 Oct 7;363(15):1471-2.
Long shadow of the stem–cell ruling
Nature. 2010 Oct 28;467(7319):1031-3.
Stem-cell laws in China fall short
Nature. 2010 Oct 7;467(7316):633.
Autoimmunity in a genetic disease - a cautionary tale
Moore MJ, Flotte TR. N Engl J Med. 2010 Oct 7;363(15):1473-5.
Improving aid for maternal, newborn, and child health
Sridhar D. Lancet. 2010 Sep 16. [Epub ahead of print]
Epigenetic drugs take on cancer
http://www.sciencemag.org/cgi/content/short/330/6004/576
Sustaining the data and bioresource commons
http://www.sciencemag.org/cgi/content/summary/330/6004/592
Confronting real time ethical, legal, and social issues in the Electronic Medical Records and Genomics (eMERGE) Consortium.
