Ancient DNA Finally Solves a 16th-Century Murder Mystery

Key Points:

• A new study published in iScience has confirmed that Grand Duke Francesco de Medici, who died mysteriously in 1587, was killed by malaria rather than poisoning, based on genetic analysis of his skeletal remains revealing Plasmodium parasite DNA.
• Researchers from Yale University and the University of Pisa also found malaria parasite DNA in the remains of Francesco’s brother, Cardinal Giovanni de Medici, who died of malaria 25 years earlier, supporting historical accounts of the disease’s prevalence in Renaissance Italy.
• The study uncovered a previously unknown strain of Plasmodium falciparum with unique mutations, offering new insights into the evolution and spread of malaria in central Italy and potentially aiding future research on the pathogen’s adaptation.
• While malaria was eradicated from Italy in the 1970s, it remains a major global health issue, causing around 610,000 deaths annually; this research provides valuable historical context to inform ongoing efforts to combat the disease.
• The researchers acknowledge challenges in working with ancient DNA due to fragmentation and contamination but emphasize the study’s contribution to understanding malaria’s history and evolution through advanced genetic techniques.