Supergene potential of a selfish centromere

Area of Science:

• Evolutionary genetics
• Molecular evolution
• Population genetics

Background:

• Centromeres are crucial for chromosome segregation during meiosis.
• Selfish genetic elements, like meiotic drive systems, can evolve and influence inheritance patterns.
• Supergenes are tightly linked loci that are inherited together, often due to suppressed recombination.

Purpose of the Study:

• To investigate the supergene potential of a selfish centromere (D) in Mimulus guttatus.
• To determine the prevalence and population history of the selfish centromere (D).
• To explore the effects of selfish centromere spread on gene expression and identify interacting genes.

Main Methods:

• Detection of the selfish centromere (D) across multiple Mimulus guttatus populations.
• Comparative transcriptome analysis between driving and non-driving haplotypes.
• Identification of candidate genes interacting with centromere drive.

Main Results:

• The selfish centromere (D) was detected in five additional populations, indicating widespread dynamics in M. guttatus.
• Large-scale cis-regulatory effects of the D haplotype on gene expression were observed within the drive region.
• Nuclear Autoantigenic Sperm Protein (NASP SIM3) was identified as a candidate gene interacting with centromere drive.

Conclusions:

• Selfishly evolving centromeres can exhibit supergene behavior, influencing genome evolution.
• The spread of selfish centromeres has significant impacts on gene expression and genome architecture.
• Further research can dissect the mechanisms and consequences of centromere drive and its associated costs.