Giant genome of the vampire squid reveals the derived state of modern octopod karyotypes.

ABSTRACT: Ancient evolutionary transitions in animal chromosomal complements and their phenotypic impacts remain understudied. Few systems exist where these events can be dissected into individual steps. In coleoid cephalopods (octopus, squid, cuttlefish), an ancient coleoid chromosomal rearrangement event (ACCRE) resulted in a substantial increase in the chromosome number. However, the discrepancies between extant octopodiform (octopus, ∼30 chromosomes) and decapodiform (squid and cuttlefish, ∼46 chromosomes) karyotypes and the direction of this transition remain unexplained. Through sequencing of the basally branching octopodiform, the vampire squid Vampyroteuthis sp., we reveal its partial retention of the decapodiform karyotype. Together with the chromosome-level assembly of the pelagic o

SUBMITTER: Yoshida MA 

PROVIDER: S-EPMC12682272 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature