Renowned Geneticist Analyzes Consumer DNA Tests
pdragon04 sends in the hardly surprising news that direct-to-consumer genetic testing isn't predicting diseases as well as they claim. "...[Francis] Collins, who played a central role in the Human Genome Project and is rumored to be the next head of the National Institutes of Health, announced at the Consumer Genetics Conference in Boston last week that he had had his genome analyzed [using a made-up name] by the big three of direct-to-consumer genetic testing: 23andMe, Navigenics, and DecodeMe. Collins said that sequence-wise, the tests 'appear to be highly accurate': there were almost no differences in the genotype information generated in the three different analyses. But there were significant differences in the numbers of genetic variations used to calculate disease risk, as well as the final risk score. ... For example, one company used 5 single nucleotide polymorphisms, or SNPs, to calculate risk for a particular disease, pronouncing Collins at low risk. Another used 10 SNPs, placing him at high risk, and the third used 15, concluding that he is at average risk."
If phenotype is not determined by genotype, then why would you put yourself at risk of higher health insurance premiums?
Francis Collins also believes that Jesus rode dinosaurs. He was once a respected scientist, but then he took a short step off a long intellectual pier. Why should I give his advice any consideration?
Sounds like there's room in the market for just the risk analysis. No reason to have the dirty work done three times - just sequence once and get a whole range of opinions, or focus on certain areas for detailed analysis. maybe this already exists.
If I'm going to drop a couple Gs on getting a genome-based risk assessment, they had damn well better deep-sequence that shit.
So which service produces, in his expert opinion, the better overall results/conclusions/advice?
I RTFA and fail to see what the pros/cons of each service is, and which one he recommends.
I know that would be a boon to whichever company is producing the better results, but who cares? If he is suppsoed to be independent, what does it matter if he gives his honest opinion?
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...and let geneticists sort us out.
sequence-wise, the tests 'appear to be highly accurate': there were almost no differences in the genotype information
Almost no differences? Can't a difference in a single gene do pretty crazy things? Like your-gene-is-alenine-don't-worry-you'll-be-just-fine. That gene-is-a-glutamate-your-eyes-will-number-eight...
Clearly the statistical analyses' are wrong for at least two of those companies. The prior probability of risk for a given disease is 'average', and if you don't test enough polymorphisms or if the correlations are weak then it remains average. Trouble is you can't make a business case on selling such weak information, so there's an incentive to spice up the summary info they provide.
sales a8d so on, Mr. Raymond's part of GNNA if
The practice of using different numbers of gene sequences is common: the same thing happens if you get an HIV test, or an HPV test, or FLU, or whatever. In that case though, the FDA regulates it to prove that the result is clinically valid. I'm not sure what involvement the FDA has in this.
From the description here an hearsay, you can assign the results in the same order than the companies are presented in this post. There is also only one of this company who manually curated experimental evidence, instead of computer text mining scientific conclusions. That is to say that risk assessments are more or less "quality controlled"...
One item in the article that surprised me: the companies aren't offering information to their clients about diseases they are carriers for. For instance, it would add value to their service if clients knew they carried the gene for cystic fibrosis (a common genetic test).
It's either a huge oversight by the 'big three', or they think that their clients are so focused on themselves as to not really care about what diseases their children could inherit.
DNA Sequencing Report for: John Doe Sequencing: 100% Complete Risk for all diseases: average. Have a good day. :)
I began performing SNP analysis on genomic DNA for schizophrenic patients back in 2002 in the new Pharmacogenoics group of a large Pharmaceutical company. Our goal was to correlate drug effect to the genetic background of the individual. If we could establish a relationship we could potentially get a few failed drugs to perform "better" when used in patients genetically predisposed for a positive effect and get them into the market.
All of our results required TEAMS of statisticians to figure out if there was any correlation. You couldn't simply look at the data and say ah-ha! they are responding! Everything was very subjective and open to interpretation.
The very best current genetic testing can do is tell you if you're more inclined toward some disease. At our current level of knowledge we have few absolutes when it comes to genes.
"Capital punishment makes the state into a murderer. Imprisonment makes the state into a gay dungeon-master"
The defense lawyers used widely varying statistical numbers from scientific experts to create doubt as to whether OJ Simpson's genes matched blood found at the crime scene. This was one piece of doubt among several others in the case before a jury eager to find any reasonable doubt to acquit.
Julie
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