Humans contain about 25,0000 protein coding genes and much more non-protein coding DNA, all of which uniquely identifies us. Because of this, DNA tests have become the standard is criminal forensics for identification of individuals at the scene of a crime. When done properly these tests can identify individuals with a theoretical probability of 1 in 10,000,000,000,000,000,000(1018). These statistics come from using the Combined DNA Index System or CODIS and focuses on identity through only 13 genes (alleles). Well, it is not actually 13 genes, it is only small parts of 13 genes. To me this seems like a very breakable and hackable system so let’s talk think about that for a minute or seven.
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Everywhere we go we leave microscopic traces of ourselves, and we collect microscopic traces of others. Microscopic DNA left at the scene of a crime is commonly used to identify criminals and substantiate evidence against them. What about other microscopic traces humans leave behind or even collect, can we be identified or tracked based solely on the bacteria that inhabit our body?
Everyone’s skin is covered in bacteria, it is all over you and the surfaces you interact with. Scientists call each community of bacteria a microbiome. Until the past few years this knowledge was little more than a curiosity as Scientists attempted to understand if this population of bacteria on our bodies affected us in any way. Then some studies came around which suggested that bacteria influence things like mammalian circadian clocks and appetites. Some others attempted to quantify the types and amounts of bacteria on our skin, inside our body, and in our environments. From all of this, Scientists began to see that both the microbiome of our environments and our bodies have unique qualities.