Asgard archaea: have we found our microbial ancestors?

Area of Science:

• Microbiology
• Evolutionary Biology
• Genomics

Background:

• The discovery of Asgard archaea has revolutionized the study of early life.
• Asgards are considered the closest prokaryotic relatives to eukaryotes.
• This relationship provides insights into the origin of eukaryotic cells.

Purpose of the Study:

• To review the discovery of Asgard archaea within the context of archaeal biology.
• To highlight how previous findings foreshadowed the emergence of Asgard archaea.
• To provide an overview of evolutionary innovations in Archaea for newcomers.

Main Methods:

• Literature review of archaeal molecular and cellular biology.
• Analysis of genomic data from Asgard archaea.
• Comparison of features across the Archaea domain.

Main Results:

• Asgard archaea possess numerous eukaryotic signature proteins.
• Their genomes support the view of Asgards as the archaeal host in eukaryotic endosymbiosis.
• Earlier research on archaea foreshadowed the significance of Asgard archaea.

Conclusions:

• Asgard archaea are crucial for understanding the origin of eukaryotes and eukaryotic cellular complexity.
• This review synthesizes current knowledge for those new to the field.
• Cultivated Asgard strains offer insights into deep evolutionary history.