Insights into Phylum Asgardarchaeota: Analysis of Two Novel MAGs Within Class Njordarchaeia.

Abstract

The exploration of early evolutionary processes, particularly focusing on archaea, provides valuable insights into the beginnings of life on Earth. Archaea, one of the three domains of life, have significantly shaped our understanding of evolution. Within archaea, the phylum Asgardarchaeota stands out for its crucial role in understanding the origins of eukaryotes and for its unique genomic and metabolic traits that make it an essential piece of the evolutionary puzzle. The study of these archaea is still in its early stages, but they have the potential to change our understanding of cellular evolution. Among the diverse groups within Asgardarchaeota, the class c__Njordarchaeia stands out as particularly intriguing yet underexplored due to its exceptional thermotolerance and metabolic flexibility. This study aims to fill the gaps in our knowledge by using advanced genomics and bioinformatic techniques to explore the genetic makeup, metabolic capabilities, and ecological roles of c__Njordarchaeia archaea in their natural habitats. Specifically, we have identified two previously unknown archaeal genomes from the deep-sea sediments of the Gulf of Kutch, Gujarat, India, belonging to the same class within Asgardarchaeota. This discovery sheds light on their evolutionary significance and ecological functions in this unique marine environment. Through comprehensive genomic analysis, including pan-genomics, pathway module profiling, functional gene characterization, and examination of metabolic pathways, as well as basic statistical analysis of genome properties, this study represents a significant advancement in our understanding of the Njordarchaeia class within Asgardarchaeota. It provides deeper insights into the molecular mechanisms underlying these newly discovered genomes within the same evolutionary lineage.

Supplementary information: The online version contains supplementary material available at 10.1007/s12088-025-01524-6.