Genome architecture evolution in an invasive copepod species complex.

ABSTRACT: Chromosomal fusions are hypothesized to facilitate evolutionary adaptation, but empirical evidence has been scarce. Here, we analyze chromosome-level genome sequences of three sibling species within the copepod Eurytemora affinis species complex, known for its remarkable ability to rapidly colonize new habitats. Genomes of this species complex show expansions of ion transport-related gene families, likely related to adaptation to various environmental salinities. Among three genetically distinct sibling species, we discover notable patterns of chromosomal evolution, with chromosomal fusions observed in two different sibling species. As a result of these chromosomal fusions, functionally linked ion transport-related genes located near the telomeres become joined near the newly formed centro

SUBMITTER: Du Z 

PROVIDER: S-EPMC12639140 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature