Studies of the lock had suggested that Beethoven could have died from lead poisoning. However, in this most recent analysis, the researches found the lock had not belonged to Beethoven, but instead a woman of Ashkenazi Jewish descent.
Additionally, a family in Belgium who thought they were related to Beethoven and who share his surname are actually not directly related to him, according to the analysis.
The cause of this surprise was due to an "extra-pair-paternity event" found in Beethoven's patrilineal ancestry, linked to the individuals' Y chromosomes.
The belief is that Ludwig van Beethoven's grandmother may have had an extramarital relationship which led to the birth of his father, says Maarten Larmuseau, a co-author of the study and a professor of genetic genealogy at the University of Leuven in Belgium.
Researchers were not able to find answers relating to Beethoven's mysterious hearing loss that occurred in his 20s, or the gastrointestinal problems which plagued him throughout his life, but they did rule and lactose intolerance as unlikely causes.