{"id":1288,"date":"2019-01-19T21:30:13","date_gmt":"2019-01-19T21:30:13","guid":{"rendered":"http:\/\/surfshields.com\/index.php\/2019\/01\/19\/curious-23andme-twin-results-show-why-you-should-take-dna-testing-with-a-grain-of-salt\/"},"modified":"2019-01-19T21:30:13","modified_gmt":"2019-01-19T21:30:13","slug":"curious-23andme-twin-results-show-why-you-should-take-dna-testing-with-a-grain-of-salt","status":"publish","type":"post","link":"https:\/\/surfshields.com\/index.php\/2019\/01\/19\/curious-23andme-twin-results-show-why-you-should-take-dna-testing-with-a-grain-of-salt\/","title":{"rendered":"Curious 23andMe twin results show why you should take DNA testing with a grain of salt"},"content":{"rendered":"
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If you\u2019ve ever enthusiastically sent your spit off in the mail, you were probably anxious for whatever unexpected insights the current crop of DNA testing companies<\/a> would send back. Did your ancestors hang out on the Iberian peninsula? What version of your particular family lore does the science support?<\/p>\n

Most people who participate in mail-order DNA testing don\u2019t think to question the science behind the results \u2014 it\u2019s science after all. But because DNA testing companies lack aggressive oversight and play their algorithms close to the chest, the gems of genealogical insight users hope to glean can be more impressionistic than most of these companies let on.<\/p>\n

To that point, Charlsie Agro, host of CBC\u2019s Marketplace<\/a>, and her twin sister sent for DNA test kits from five companies: 23andMe, AncestryDNA, MyHeritage, FamilyTreeDNA and Living DNA.<\/p>\n

As CBC reports, \u201cDespite having virtually identical DNA, the twins did not receive matching results from any of the companies.\u201d That bit shouldn\u2019t come as a surprise. Each company uses its own special sauce to analyze DNA, so it\u2019s natural that there would be differences. For example, one company, FamilyTreeDNA, attributed 14 percent of the twins\u2019 DNA to the Middle East, unlike the other four sets of results.<\/p>\n

Beyond that, most results were pretty predictable \u2014 but things got a bit weird with the 23andMe <\/span><\/a> data.<\/p>\n

As CBC reports<\/a>:<\/p>\n

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According to 23andMe\u2019s findings, Charlsie has nearly 10 per cent less \u201cbroadly European\u201d ancestry than Carly. She also has French and German ancestry (2.6 per cent) that her sister doesn\u2019t share.<\/p>\n

The identical twins also apparently have different degrees of Eastern European heritage \u2014 28 per cent for Charlsie compared to 24.7 per cent for Carly. And while Carly\u2019s Eastern European ancestry was linked to Poland, the country was listed as \u201cnot detected\u201d in Charlsie\u2019s results.<\/p>\n<\/blockquote>\n

\"\"<\/p>\n

The twins shared their DNA with a computational biology group at Yale, which verified that the DNA they sent off was statistically pretty much identical. When questioned for the story, 23andMe noted that its analyses are \u201cstatistical estimates\u201d \u2014 a phrase that customers should bear in mind.<\/p>\n

It\u2019s worth remembering that the study isn\u2019t proper science. With no control group and an n (sample size) of one set of twins, nothing definitive can be gleaned here. But it certainly raises some interesting questions.<\/p>\n

Update:<\/strong> A 23andMe spokesperson provided the following statement to TechCrunch to contextualize the results in question:<\/p>\n

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The variance in Charlsie\u2019s and Carly\u2019s 23andMe results are primarily within the \u201cBroadly European\u201d estimate. This category captures segments our algorithm could confidently identify as European, but not confidently classify more precisely, into countries for example. It\u2019s not inconsistent for one twin to have more \u201cBroadly European\u201d than the other. It means that for one individual the algorithm was not confident enough to make more granular predictions. For example, for one twin we were able to identify 2.6% French and German, whereas for the other that portion of the genome was assigned to Broadly European.<\/p>\n<\/blockquote>\n

The company also emphasized \u201cthe distinction that [23andMe\u2019s] ancestry testing is different from our health report testing, which is regulated by the FDA and meets the agency\u2019s standards for accuracy and clinical validity.\u201d<\/p>\n

Twin studies have played a vital role in scientific research<\/a> for ages. Often, twin studies allow researchers to explore the effects of biology against those of the environment across any number of traits \u2014 addiction, mental illness, heart disease and so on. In the case of companies like 23andMe, twin studies could shed a bit of light on the secret algorithms that drive user insights and revenue.<\/p>\n

Beyond analyzing the cold, hard facts of your DNA, companies like 23andMe attract users with promises of \u201creports\u201d on everything from genetic health risks to obscure geographic corners of a family tree. Most users don\u2019t care about the raw data \u2014 they\u2019re after the fluffier, qualitative stuff. The qualitative reporting is where companies can riff a bit, providing a DNA-based \u201cpersonal wellness coach\u201d or advice about whether you\u2019re meant to be a morning person or a night owl.<\/p>\n

Given the way these DNA services work, their ancestry results are surprisingly malleable over time. As 23andMe notes, \u201cbecause these results reflect the ancestries of individuals currently in our reference database, expect to see your results change over time as that database grows.\u201d As many non-white DNA testing customers have found, many results aren\u2019t nearly as dialed in<\/a> for anyone with most of their roots beyond Europe. Over time, as more people of color participate, the pool of relevant DNA grows.<\/p>\n

Again, the CBC\u2019s casual experiment is by no means definitive science \u2014 but neither are DNA testing services. For anyone waiting with bated breath for their test results, remember that there\u2019s still a lot we don\u2019t know about how these companies come to their conclusions. Given the considerable privacy trade-off in handing over your genetic material to big pharma<\/a> through a for-profit intermediary, it\u2019s just some food for thought.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

https:\/\/techcrunch.com\/2019\/01\/18\/dna-testing-twin-results-show-why-you-should-take-dna-analysis-with-a-grain-of-salt\/<\/p>\n","protected":false},"author":0,"featured_media":1289,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1288","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/posts\/1288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/comments?post=1288"}],"version-history":[{"count":0,"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/posts\/1288\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/media\/1289"}],"wp:attachment":[{"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/media?parent=1288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/categories?post=1288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/surfshields.com\/index.php\/wp-json\/wp\/v2\/tags?post=1288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}