When we talk about DNA tests applied to genealogy, we are referring to the so-called autosomal ancestry tests, consumer products distributed by private companies. Unlike clinical genetic tests, which analyze specific mutations for medical purposes, or forensic tests used by authorities, these kits analyze small fragments of genetic code to estimate our belonging to certain geographic populations. These are tools born as a middle ground between science and entertainment, based on the statistical comparison between the profile of the kit purchaser and the samples present in the company’s databases.
The illusion of being able to decode one’s entire family history simply by mailing a vial of saliva has conquered millions of people. We are constantly bombarded by advertising messages promising to reveal hidden identities and exotic connections through colorful charts and seemingly precise percentages. However, for those living in Italy or Europe who wish to seriously reconstruct their past, it is necessary to look beyond the marketing. The technology behind these services does not sequence the entire genome, but looks for similarities with modern populations: a method that works well for recent migrations, but often proves disappointing for those coming from families settled in the Old Continent for centuries.
The first major hurdle that scales back the usefulness of these tools is their limited temporal depth. Many believe they are buying a time machine capable of confirming descents from the Romans, the Lombards, or the Normans, but current technology allows for none of this. The horizon of these tests stops, in the best of cases, at about seven to ten generations ago, taking us back no further than the 18th century. The minimal percentages suggesting distant or “exotic” origins are often the result of statistical noise or calculations that struggle to distinguish between genetically close populations. In essence, the analysis cannot tell us the deep history we seek.
But if the limited historical usefulness can only be considered an economic disappointment, the true cost of these services lies in something much more precious: our biological privacy. When we accept the terms of service of these companies, we are not simply sharing a name or an email address. We are handing over our genetic code, the only truly immutable data of our existence. Once this information enters a corporate database, we lose exclusive control over it, transforming our biological essence into a string of data that can be archived, analyzed, and potentially commercialized for decades.
There is an even more disturbing ethical aspect concerning the very nature of DNA: it is not exclusively individual data, but is shared. Undergoing such a test effectively means exposing the privacy of one’s parents, siblings, and children without their consent. The moment the genetic profile is online, it becomes possible for third parties to deduce information about the health and origins even of relatives who never chose to participate. We are making an irreversible decision on behalf of an entire family group.
Furthermore, the stability of these companies is not guaranteed. We have already witnessed scenarios in which large companies in the sector, finding themselves in financial difficulty, have considered selling their databases as a primary asset. The concrete risk is that our most intimate data will end up in the hands of giants interested not in genealogy, but in the economic value of our genetic predispositions. We become, unbeknownst to us and paying out of our own pockets, the raw material for a business that has nothing to do with the rediscovery of our roots.
Faced with this scenario, the balance appears distinctly unfavorable: on the one hand, we obtain vague, geographically predictable, and temporally limited information; on the other, we pay a very high price in terms of security. For those truly interested in discovering their family’s history, giving a name to their ancestors, and reconstructing their real lives, the main road remains rigorous documentary research.
Relying on a professional genealogist means choosing an approach that digs much deeper than a test tube ever could. Through parish archives, notarial deeds, and civil registries, it is possible to trace back through the centuries with a precision that DNA cannot offer, reconstructing real life stories and relationships. Archival research respects your privacy, does not turn you into a statistical data point, and returns to you a solid and documented heritage of memory.
