Round-up March 3rd – March 17th

A mother whose son died in 2008 is suing Quest Diagnostics for reporting a variant as a VUS, when there was sufficient evidence for it to be pathogenic — the claim is that if it had been reported as pathogenic, his treatment could have been changed, and his life potentially saved.  The case highlights the importance of variant classification decision transparency. One lawyer’s commentary: there is precedent for a court saying that in hindsight “although everyone was doing things a certain way, they shouldn’t have been. It could turn up the pressure [on labs’] handling of VUS. It could force labs to be more collaborative and share data out of fear.” Heartbreakingly, and raising a whole set of other issues, the mother initially refused follow-up genetic testing (context is that a mitochondrial variant was suspected): “I didn’t want someone to confirm that it was me that killed my child.” The GenomeWeb write-up is a must read: https://www.genomeweb.com/molecular-diagnostics/mothers-negligence-suit-against-quests-athena-could-broadly-impact-genetic

A study that compared WES as a first-tier test to standard of care came out favorably for WES: “Of 80 enrolled infants, 46 received a molecular genetic diagnosis through singleton WES (57.5%) compared with 11 (13.75%) who underwent standard investigations in the same patient group.” http://www.nature.com/gim/journal/vaop/ncurrent/full/gim20161a.html

But a meta-analysis, which focuses on common diseases, has found “Expectations that communicating DNA-based risk estimates changes behavior are not supported by existing evidence.”  http://www.bmj.com/content/352/bmj.i1102.

Veritas, one of George Church’s companies, is offering a $999 genome (including interpretation and genetic counseling, cf Ilumina’s ~$3000). The test must be prescribed. http://www.sandiegouniontribune.com/news/2016/mar/04/genome-sequence-veritas/

An opinion piece in JAMA, http://jama.jamanetwork.com/article.aspx?articleid=2498853, argues that the variant classification system is not up to muster: “The information the physician usually needs is the likelihood of disease among patients with the variant (penetrance), and an assessment of whether the genetic profile requires action or not.” The authors seek a quantitative disease-risk estimate, as GWAS attempted to do, and call for the sharing of full genotype-phenotype data.

I think the way the variant classification advocates would respond is to say that classification is only one part of interpretation. A variant’s classification is the same no matter its context, and independent of penetrance. A variant’s classification should be teamed with the penetrance of the variant and whether the inheritance mode is consistent to give an interpretation.

An antigen is any substance that causes the immune system to produce antibodies against it. Some proteins, when mutated (as detected by sequencing), can become neoantigens. If there are Tcells that react to these neoantigens, these neoantigens can become targets for therapy, by a vaccination approach. This would be done in combination with Immune checkpoint inhibitors, drugs that take the ‘brakes’ off the immune system. This work appears in Science, http://science.sciencemag.org/content/early/2016/03/02/science.aaf1490. Connecting success of the idea with the underlying genetics, the authors note that: “Tumors with both a high clonal neoantigen burden and low neoantigen ITH (intra-tumor heterogeneity) were associated with significantly longer progression free survival.”

And on the subject of cancer, there’s increasing interest in the role bacteria play, with some suggestions that bacteria can act as therapy, by themselves and in combination with immunotherapies: http://www.bloomberg.com/news/articles/2016-03-14/how-gut-bacteria-are-shaking-up-cancer-research.

And while on the subject of bacteria, a group of researchers have published an editorial in the Journal of Alzheimers drawing attention to the possible role of microbes in causing Alzheimers, a link they claim has been “neglected” for too long, and needs urgent further research: http://content.iospress.com/articles/journal-of-alzheimers-disease/jad160152. The authors point to the fact that APOE ɛ 4 – which makes one in five people more susceptible to Alzheimer’s disease, also raises their susceptibility to infectious disease.

At least 4% of human genes shown to tolerate homozygous LOF variants: http://science.sciencemag.org/content/early/2016/03/02/science.aac8624.full-text.pdf+html

Methylation patterns can indicate what tissue-type DNA comes from: opening possibility of using cell-free DNA to indicate where cell death may be occuring, and hence diagnosing e.g. neurodegenerative disease early: https://www.genomeweb.com/gene-expression-research/researchers-use-methylation-patterns-trace-cell-free-dna-back-tissue-origin

Some genetic counsellors are paid by test companies, and have been under fire for not disclosing these links: http://news.wgbh.org/2016/03/11/science-and-technology/after-angry-moms-fault-counseling-genetics-society-cites-its

A paper outlining a platform for attaching actionable data to somatic variants, from the Jackson lab: http://humgenomics.biomedcentral.com/articles/10.1186/s40246-016-0061-7

A good review of “good” variants, including large wellderly type studies: http://www.pnas.org/content/113/10/2554.long

“Right Drug, Right Dose, Right Time” — a study that claims to build the case for pre-emptive pharmacogenomics screening, that put results of an 84 gene panel into EMRs. http://www.ncbi.nlm.nih.gov/pubmed/26947514?dopt=Abstract

Ambry is making its patients’ data publicly accessible, to be limited to frequency data, and starting with 10,000 exomes. “Ambry said its data would be from people with the diseases it tests for, like epilepsy and intellectual development problems… it hoped to add data from as many as 200,000 customers a year to the database”: http://www.nytimes.com/2016/03/08/business/genetic-test-firm-to-put-customers-data-in-public-domain.html?smid=pl-share&_r=0

A piece that argues for “routine, early and cumulative screening for genetic predictors of efficacy, as an integrated component of clinical trial analysis”: http://www.nature.com/nrg/journal/v17/n4/full/nrg.2016.12.html

A review of the use of NGS to investigate an individual’s repertoire of immune cells: http://www.nature.com/gene/journal/vaop/ncurrent/full/gene20169a.html

A new national centre for genotyping blood groups was announced, aiming to meet the need of accurately matching donors and receivers of the over 300 blood groups known: https://www.genomeweb.com/clinical-sequencing/new-national-center-aims-expand-use-genomics-more-accurate-blood-typing

After Genomics comes more generalized Omics, like this new program from Michael Snyder that aims to follow various omes of 1000 subjects over several years: https://www.genomeweb.com/proteomics-protein-research/stanfords-snyder-launching-new-personalized-omics-profiling-project

Should you get paid for your genetic data? http://www.fastcompany.com/3057732/should-you-get-paid-for-your-dna

A piece by a woman with Turner syndrome, in reaction to the increasing availability of this diagnosis pre-birth: https://news.wgbh.org/2016/03/07/local-news/look-me-why-genetic-test-results-dont-tell-full-story

“From wolf to woof” — a new company that will test your dog’s genome: https://www.genomeweb.com/applied-markets/consumer-startup-embark-veterinary-debut-canine-dna-test

 

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s