Metagenomic peek into a corn mummy.

Area of Science:

• Archaeogenetics
• Ancient DNA Analysis
• Bioarchaeology

Background:

• Metagenomics offers insights into ancient biological materials.
• Corn mummies are ritual artifacts from ancient Egypt composed of cereal grains.
• Understanding the microbial and biological composition of such artifacts is crucial.

Purpose of the Study:

• To investigate the preservation of ancient DNA within a corn mummy.
• To identify the organisms present in the mummy and determine their origin (ancient vs. modern).

Main Methods:

• Metagenomic sequencing was performed on samples from a 3rd century BC Egyptian corn mummy.
• Bioinformatic analyses were used to identify DNA sequences and their origins.
• Comparative genomics was employed to determine the closest relatives of identified sequences.

Main Results:

• Ancient DNA, including bacterial, plant, animal, and human sequences, was detected alongside modern contaminants.
• Bacterial DNA primarily belonged to genera such as Bacillus and Paenibacillus.
• Plant DNA showed similarity to ancient Triticum (wheat) from the region, and animal DNA to Sphingidae moths.
• Human DNA revealed common African haplotypes (mtDNA L3, Y-chromosome E and J).

Conclusions:

• Corn mummies can preserve ancient DNA, serving as valuable bioarchaeological resources.
• The identified ancient DNA provides insights into the environment, agriculture, and human populations of ancient Egypt.
• Metagenomics is a powerful tool for reconstructing past ecosystems and human history from archaeological artifacts.