Pet DNA testing company in doghouse after identifying human as canine
Pet DNA testing company in doghouse after identifying human as canine

Pet DNA testing company in doghouse after identifying human as canine

cross-posted from: https://kbin.social/m/news@lemmy.world/t/895673
DNA My Dog received human genetic sample and identified it as a malamute, shar-pei and labrador, according to news station
This may be easy to explain in case their system doesn't account for the possibility that whatever DNA they get is not from a dog. Then whatever they answered is just the dog race with DNA closest to human, according to their metrics.
They very likely have a set of possible target DNA references, and look at how close whatever they get is to each of these.
And there are different metrics with which one can measure DNA similarity. Hence it also is to be expected that a different company would return different results. Albeit not super different.
They also don't report the confidence of their results. DNA tests, even the kind used for forensics in criminal investigations, don't give perfect results, there's always some uncertainty. I think there are probably a lot of instances where they have a very low confidence in the results but send them out anyway.
As of today, it is impossible to report an accurate confidence value for these kinds of analyses. The required theoretical work has not been done yet, and of course may turn out impossible. However, there are tons of ways to estimate confidence.
One of the other companies cited in the article seems to be a bit better about this. They seem to filter out non-dog DNA, and if there is not enough dog DNA left after this, then they report that the sample was bad.
Dogs have 38 pairs of chromosomes, humans only 23. It should not be possible for this to happen.
In the article they claim they got results from one of the human cheek swabs and not the other. It is possible that they just don't keep their equipment clean enough and some actual dog DNA got into the mix.
Either way, the other companies receiving similar samples just said there was no dog DNA there. This company has repeatedly provided dog results for human DNA samples. Whatever happened they're doing something very wrong.
They have 1 job and failed at that
You have no idea what you are talking about.