Analysis of male specific region of the human Y chromosome sheds light on historical events in Nazi occupied eastern Poland.

In Poland, during the World War II, almost 3 million people were killed during the Nazi occupation, and about 570,000 during the Soviet occupation. Furthermore, historians have estimated that after the World War II at least 30,000 people were killed during the Stalinist regime in Poland (1944-1956). The exact number is unknown, because both executions and burials were kept secret. Thousands of people just vanished. As a response to those events, forensic scientists from the Pomeranian Medical University in Szczecin in cooperation with historians from the Institute of National Remembrance started the project of the Polish Genetic Database of Victims of Totalitarianism, which aim is to identify victims killed in the years 1939-1956. Several exhumations were done under the project, with the biggest one done in Białystok. According to the information gathered by local historians, a detention centre in Białystok was the place of the secret burials in late 1940s and 1950s. Surprisingly, except few graves from the post-war period, most of the burials found in Białystok indicated that majority the victims were probably local civilians who died during the Nazi occupation. Unfortunately, data concerning what happened in the detention ward during that period of time is not very detailed. What was known is that people who got incarcerated were "political prisoners" what, according to Nazi politics, was based on their nationality, religion and activity against the Third Reich. The aim of this research was to test genetically the remains found in Białystok to determine their possible ethnic background, in order to shed new light on the victims and what happened in the Białystok detention centre during the Nazi occupation. The analysis of male specific region of the human Y chromosome shows that including phylogenetic analysis into the complex process led by the Polish Genetic Database of Victims of Totalitarianism may help with the final identification of hundreds of anonymous victims.