The Potsdam laboratory’s approach — single-stranded library preparation with whole genome sequencing — is complementary. Single-stranded library preparation captures all single-stranded DNA fragments present, including very short ones that would be excluded from double-stranded library preparation. This increases the yield of sequence data from highly degraded material and allows recovery of sequence information from fragments so short that conventional methods would not capture them.
Together, these methods explain why the 2024 study could recover interpretable mtDNA from hair that is approximately 190 years old, and why the results could be authenticated as genuine ancient DNA rather than contamination artifacts.
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## The Longer View: Identity Mysteries and What Science Can Resolve
The Kaspar Hauser case is part of a broader category of historical identity mysteries — cases in which a person’s true origin, identity, or the circumstances of their death have remained uncertain for extended periods, attracting sustained scholarly and popular attention. Looking at the Hauser case in the context of similar cases illuminates both what makes it distinctive and what the 2024 resolution demonstrates about the broader potential and limitations of genetic historical investigation.
The identification of Richard III in 2012 stands as the most famous example of a historical identity mystery resolved by genetic analysis in recent decades. In that case, the question was whether skeletal remains discovered in an unexpected location were those of a known historical figure. The genetic analysis confirmed the identity beyond reasonable doubt. The key was that there was a known historical lineage to compare against and a physical specimen — bone — that yielded adequate DNA.