Genome scans for the whole family: 23andMe research director talks about genotyping her kids

One of the ethical quandaries raised by direct-to-consumer genetic testing is the possibility that customers may send in DNA samples for analysis from other people who haven't provided informed consent - prospective spouses, for instance, a la Gattaca - and then use that genetic information for nefarious purposes. In the past, personal genomics company 23andMe has responded to this possibility by arguing that it's not really the company's responsibility to prevent its customers from performing illegal acts; they have also (quite convincingly) pointed out the difficulties of extracting 2 mL of saliva from an unwilling victim without arousing suspicion.

However, there is one class of potential customers who are legally unable to provide informed consent, but who could usually be convinced quite easily to give up a tube full of spit: customers' children. And in this case 23andMe's view seems to be extremely relaxed - they even have a non-judgmental warning about the difficulty of collecting the required saliva from infants under 3.

In fact, judging from a recent entry on 23andMe's corporate blog The Spittoon, the company is actively encouraging customers to bring their own kids into the happy 23andMe family. This is a bold move, and one that is likely to provoke considerable controversy (and outrage). But rather than shying away from this debate 23andMe seems determined to confront the issues head-on.

The post is by Stanford Assistant Professor Joanna Mountain, who heads a genetic anthropology research group and also serves as senior director of research at 23andMe. In the post Mountain describes the process of registering her two sons (aged 7 and 12) for analysis of several hundred thousand genetic markers at 23andMe - and while she acknowledges the ethical issues associated with analysing children's genetic data, such concerns don't seem to have weighed heavily on her mind:

The question of whether and under what circumstances children should be genotyped has been debated for decades, and this ethical discussion is a fascinating and important one. As a scientist however, I chose to take a pragmatic approach.

Mountain frankly discusses the major issues associated with genotyping her children: the possibility of revealing non-paternity (thankfully not an issue for either of her sons, although she admits to some momentary discomfort as the results came in), and of course the chance that the scan might reveal some seriously nasty disease predisposition.

The latter situation is unlikely for the current version of the 23andMe test, which reports only on common variants with a generally small effect on disease risk, and deliberately excludes the APOE variants associated with Alzheimers disease. However, uncovering serious disease risk will become more of an issue as personal genomics companies move into large-scale gene sequencing (as Navigenics will be later this year, and 23andMe keeps hinting at) - such detailed testing could reveal genetic defects associated with a near-certainty of horrific diseases such as Huntington's.

As you would expect from the excerpt above, Mountain takes a matter-of-fact attitude regarding such a possibility:

And what if we are surprised one day, with news that one or both of the boys is at high genetic risk for a serious disease? I predict that we'll use that information somehow. We'll learn more about the disease, we'll study all the prevention and treatment options. We'll find out about the latest research, and take steps to prevent anyone from feeling that they "caused" this by handing down a mutation. We'll be proactive. It'll be a family project.

There is a genuine ethical quandary here: adults can choose whether or not they wish to know about their genetic risk of a serious disease (particularly one for which there is no effective treatment), but children can't make this decision in an informed sense - and once they have that knowledge, it can never be undone. In a sense, Mountain could be seen as violating her sons' autonomy to remain ignorant of their genetic disease risks.

However, Mountain notes that she only allows her sons to access their data under her supervision - and indeed that it is 23andMe policy that children are not allowed to "own" their own accounts. This approach provides the option for parents to filter out any potentially seriously harmful results until their children are old enough to decide for themselves whether or not they wish to know.

Overall, Mountain argues that the process of investigating her sons' genetic makeup has been a rewarding and educational experience for both them and their parents, and that the benefits outweigh the potential risks and ethical objections. And for what it's worth - and of course I speak as someone without children, and as someone with a pretty laissez-faire view of genetic information - I think her overall argument is convincing. But there's also an interesting story between the lines here that's worth expanding on.

Social engineering and economics in the genome age
Mountain's depiction of the testing and analysis as a positive, interactive process serves as a striking contrast to the visceral revulsion I often encounter regarding the notion of genetic testing of children. Of course, that's presumably precisely the message that 23andMe wants people to hear as they read Mountain's story, because there's a strong commercial incentive for 23andMe and other personal genomics companies to convince customers to bring their family into the fold.

In addition to simply selling more tests, exploring genetic information from multiple family members creates a much richer and more rewarding experience for customers who might otherwise lose interest after a few months of poking around in their own genomes. There's the fun of tracing specific traits through the family tree, and there's also a much larger potential interest pool whenever 23andMe's database of genetic associations is updated: hearing about a new risk variant for schizophrenia might not hold much interest for the average customer - but it might if they can immediately check to see if their crazy uncle Harry (or their moody adolescent son) is a carrier.

This extra long-term value will keep customers coming back for additional tests - large-scale sequencing, then whole genomes, and then epigenomes, and who knows what else. But most importantly, it creates an incentive for customers to recruit new family members, who then recruit other branches of the family tree, ultimately perhaps creating the sort of passive Facebook-style self-marketing product that most companies can only dream about. That keeps the revenue streaming in, and also helps to build up the customer database that 23andMe needs to start carrying out its own genetic association studies.

However, to create such a market 23andMe needs to do some non-trivial social engineering: the company needs to tear down the engrained, visceral opposition of large sections of society towards the notion of both genetic testing of children and of sharing genetic information with others, and replace it with a positive view.

Mountain's post is one small step towards this goal. While the scientist's rather cold rationalisation of her choices won't appeal to everyone, it may well strike a chord with the well-educated, scientifically-minded humanists (the Wired readers, if you will) who have always represented a big chunk of 23andMe's core demographic. The sheer coolness of Mountain tracing the descent of her sons blue eye alleles to her own father is a powerful attraction to such potential customers - if they can be convinced to overcome any taboos that stand in their way.

Of course, this is an easier audience to convince than the rest of society, but it's a start, and there have been hints that the general social environment is becoming more permissive to such attitudes. If the Personal Genome Project succeeds in its goal of demystifying genomics and encouraging the open sharing of genetic information the balance will tip even further in 23andMe's favour.

The dangers
I should emphasise that genotyping your kids isn't always a great idea. The major danger, of course, is that rather than treating the process as a learning exercise some parents might use seriously incomplete genetic information as a basis for pushing their kids down specific life paths, perhaps to their considerable detriment.

This isn't merely an abstract possibility: a Singaporean company, DNA Destiny, is already marketing a "DNA Kids Innate Talent Test". Details are scarce on the company's website, but a recent article in Asia One states that the test "can identify up to 33 genetic traits, such as intelligence, emotional quotient (EQ) and entrepreneurship".

The prospect of parents making long-term decisions about their childrens' careers based on such tests is a worrying one: right now, the genes underlying these traits are essentially completely unknown (with most reported findings in the scientific literature being either unreplicated or subsequently falsified), so the company will be providing a costly, scientific-sounding but ultimately meaningless prediction to parents. To be fair, this is probably not greatly worse than the hundreds of arbitrary ways that well-meaning parents make decisions that influence their child's future - but it's certainly not the direction that I'd like to see personal genomics head.

DNA Destiny is a small and amateurish fish, and there's certainly no evidence that 23andMe or the other major players in personal genomics would ever stoop to this kind of ugliness - they shouldn't be judged on the basis of the behaviour of the bottom-feeders in their industry. However, it will be important for everyone involved in the industry, including regulators, commentators and the companies themselves, to make sure such activities are publicly shamed and marginalised. If 23andMe plans to actively encourage parents to genotype their kids it will be important for them to be leaders in educating their customers - and the broader public - about the dangers of such behaviour.

Edit 30/10/08: Section on the future of genomics removed to avoid distractions from the main theme of the post - to be reposted elsewhere.

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Personally, I understand the concept of "accurate and relevant" but

we are living in a world where truth is derived from tales produced from looking into crystal spheres and medication is provided by homeopaths. Geneopaths will show up as soon as enough clients got unsatisfactory - correct or not -predictions from the specialists.


So long as it can be shown that genetic predictions are both accurate and relevant, I find it hard to see how it could be unethical to use them to help kids make choices about their futures. Naturally, careful industry regulation will be required to ensure that this model - rather than the naive and potentially frankly deceptive approach of DNA Dynasty - is the future of gene-based career counselling.

Are we really contemplating this as reality? This is crazy. There area whole host of things that skew the infallability of DNA.....including Epigenetics, Environment, Society, the idea of this whole string is crazy!!!

Is trial and error education/coaching equivalent to trial and error medicine.....I have to say I don't think so....

Living by mathematical models will make life dull!!!
More importantly, it contradicts what my mother always taught me. "You can do anything you want so long as you put your mind to it" I am certain she didn't include dunking a basketball......but it was motivation nonetheless...

Do we really want to tell a kid....the best they can do is a cashier at a fast food restaurant. In fact I would argue that those working as cashiers probably needed to hear that the world was their oyster as a child, but probably never heard that...


I guess now we can tell our children, with much more certainty, that they inherited certain traits from their father and others from mom.


Only time for a quick response:

1. I never argued that DNA was infallible, and in fact went out of my way to note that almost all genetic predictions are probabilistic, and always will be;

2. I can't see why having extra (reliable) information to inform your decisions necessarily makes life dull. Do you inform your patients not to have their cholesterol tested because it would take all the mystery and romance out of their future?

Hi Sandra,

Not just that - if you have a particularly strong trait running in your (large) extended family (an odd-shaped nose, or unusual ears, for instance), with genome-wide genotypes from all of them you'd have a chance of actually mapping the genetic region responsible. Now that would be cool.

Awww come on you actually mean to think you can state that and get away with it. Here's what you said

"2. I can't see why having extra (reliable) information to inform your decisions necessarily makes life dull. Do you inform your patients not to have their cholesterol tested because it would take all the mystery and romance out of their future?"

Is cholesterol really the same as the 9p21? Well, (cholesterol) has been studied for over 30 years now....unlike your fancy SNP garbage from 2007....which BTW failed replication in a dutch population....

Bad info is far worse than no info at all buddy......



A personal genomics company should never sell a test that was not independently replicated. Sadly, this is not the case. They just find an association for a genetic to put a person at risk for a condition and sell the test. This is called SNP testing garbage. RELIABLE AND TRUSTWORTHY TESTS NEED INDEPENDENT TESTING AND VALIDATION.


All three reputable personal genomics companies have fairly stringent criteria regarding whether or not a particular test is reliable. 23andMe does provide information about less well-validated tests, but this information is flagged for the consumer as lower-reliability. The most serious issue with current personal genomic data is not that the tests themselves are "garbage", but that in most cases they capture only a relatively small fraction of the total variation in disease risk - so they're not strongly predictive of an individual's ultimate probability of contracting a disease.

Daniel, re: n/a's comment,

Has evidence of the lack of 'inter-company' accuracy (equivalence) of the interpretive results been discussed in this forum?

By Miss Interpretation (not verified) on 31 Oct 2008 #permalink

I would want to know the fetus' snp's before it would be too late to abort. And if I were 20 again, I would want to check out the snp's of a date. I am stuck with my snp's but would have some choice otherwise. Obviously, there would have to be some tolerance for lack of perfection. (What is perfection anyway?) I am encouraging my sons to get my grandkids' snp's, and theirs too. For example, had I known I had a significantly higher than average probability of becoming diabetic, I would have not been such a pig at the dinner table, or at least avoided the carbohydrates. Now, I must make the effort to avoid the progressive damage of diabetes, and suffer those around me yakking about the side effect of my eating acarbose like candy.

To be forewarned is to be forearmed. A person needs to plan their life with as much knowledge as available. Better be an ant than a grasshopper in the cold and hungry. Many mom's push their kids into medical school, why not make other decisions for kids as well? There are helicopter parents all over.

My mom still lives and I am telling her that she can pass her snp's list to her descendants free of estate tax-to get her past what knowing might do for her.

By Jim McMillan (not verified) on 01 Nov 2008 #permalink

What if a woman (now deceased), had an adulterous affair which resulted in a male child. The affair is never discovered. In adulthood this man and his sister engage in an incestuous one night stand, which results in the birth of a female child. If the child is also now an adult and want's to know her genetic history, could she with the help of an uncle (who is brother to both the girls mother and suspected father), submit to a DNA test to determine her ancestry (or is that incestry) and in so doing reveal her incestuous parentage and also her adulterous grand parentage.

Three questions. A) Is it technically possible? B) Is it legal particularly in Australia? C) What do you consider the ethical implications to be?

A) Assumes that the ancestral heritage is preserved in the genetic similarity between the uncle and the niece, but that the extra helping of uncle genes from both parents are not precisely canceled out by the dilution of brother genes in the first adultery.

Regards Bob