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Yale and Pisa Universities’ genetic analysis of Medici family remains confirms 16th-century deaths were caused by malaria, debunking centuries of poisoning theories. The study in iScience identifies Plasmodium falciparum DNA in Giovanni de’ Medici’s bones and a different malaria strain in Francesco de’ Medici’s remains, aligning with historical records of fever outbreaks.
Genetic Evidence Resolves Centuries-Old Mystery
Researchers from Yale University and Pisa University sequenced DNA from four rib bones excavated from Florence’s Medici Chapel. The team used next-generation sequencing (NGS) to analyze ancient DNA (aDNA) extracted from the remains of Giovanni (d. 1574) and Francesco (d. 1587), two figures. The study’s methodology mirrors techniques used in ancient pathogen research on the Black Death, employing hybridization capture to enrich for malaria-specific genetic markers.
"The genetic material we recovered is exceptionally well-preserved, suggesting the samples were processed using protocols similar to those in Illumina's aDNA sequencing workflows."
Methodology Behind the DNA Analysis
The team employed a multi-step process to authenticate the results. First, they used qPCR to detect Plasmodium-specific 18S rRNA genes, then validated findings through shotgun metagenomic sequencing. The analysis revealed a higher number of reads matching P. falciparum in Giovanni’s sample, compared to a lower number of reads for the less virulent P. vivax in Francesco’s remains. This discrepancy correlates with historical accounts of Giovanni experiencing “intermittent fevers” while Francesco’s illness included “severe chills and delirium.”
Historical Records Confirm Malaria Diagnosis
Contemporary medical records from the Medici court, digitized by the Biblioteca Medicea Laurenziana, describe symptoms matching malaria’s “trio of chill, fever, and sweat.” Giovanni’s physician, Alessandro Scarabelli, documented “a recurring fever that worsened in the summer months,” while Francesco’s courtier noted “a wasting illness that left him unable to walk by his final days.” These accounts align with the clinical manifestations of P. falciparum, which causes cerebral malaria and severe anemia.
The research also addresses longstanding
