Herring's Immune Gene Diversity Surpasses Humans'
Millions of years of natural selection fueled this extraordinary diversity in 14 sequenced fish genomes
Researchers have made a groundbreaking discovery about the Atlantic herring, finding that it has an extraordinary level of diversity in immune genes. This diversity exceeds that of other vertebrates, including humans, and is believed to be the result of millions of years of natural selection.
The study, published in Science Advances, was led by the Texas A&M College of Veterinary Medicine and Biomedical Sciences (VMBS) and involved sequencing the complete genomes of 14 fish collected from three geographic locations across the species' range. The researchers used long-read sequencing technology to measure the diversity of MHC genes, which play a critical role in the vertebrate immune system.
MHC molecules help the body recognize harmful invaders by presenting fragments of viruses, bacteria, parasites, and other foreign proteins to immune cells. This allows the immune system to mount a defense against diseases. The researchers believe that the diversity of immune genes in Atlantic herring is a result of the species' need to continually adapt to defend itself against an ever-changing array of pathogens.
The study's findings are significant, as they provide insight into the evolution of the immune system in vertebrates. Dr. Leif Andersson, a professor in VMBS' Department of Veterinary Integrative Biosciences and principal investigator of the study, noted that the team's previous work had revealed many genes contributing to ecological adaptation in the Atlantic herring, but it had been challenging to study immune genes due to their complexity.
## Why it matters The discovery of the Atlantic herring's extraordinary immune gene diversity has important implications for our understanding of the evolution of the immune system in vertebrates. The fact that the species has developed such a high level of diversity in its immune genes suggests that it has been subject to intense selective pressure over millions of years. This has allowed the Atlantic herring to thrive in environments where other species might be more susceptible to disease.
The study's findings also highlight the importance of continued research into the immune systems of non-human species. By studying the immune genes of species like the Atlantic herring, scientists can gain a deeper understanding of the evolution of the immune system and develop new insights into how to combat diseases in humans and other animals.
