ABSTRACT
Pacific Ocean rockfishes (genus Sebastes) exhibit extreme variation in life span, with some species being among the most long-lived extant vertebrates. We de novo assembled the genomes of 88 rockfish species and from these identified repeated signatures of positive selection in DNA repair pathways in long-lived taxa and 137 longevity-associated genes with direct effects on life span through insulin signaling and with pleiotropic effects through size and environmental adaptations. A genome-wide screen of structural variation reveals copy number expansions in the immune modulatory butyrophilin gene family in long-lived species. The evolution of different rockfish life histories is coupled to genetic diversity and reshapes the mutational spectrum driving segregating CpGâTpG variants in long-lived species. These analyses highlight the genetic innovations that underlie life history trait adaptations and, in turn, how they shape genomic diversity.
Subject(s)
Biological Evolution , Genome , Longevity/genetics , Perciformes/genetics , Perciformes/physiology , Animals , Butyrophilins/genetics , DNA Repair/genetics , Gene Dosage , Genetic Pleiotropy , Genetic Speciation , Genetic Variation , High-Throughput Nucleotide Sequencing , Immunomodulation/genetics , Life History Traits , Mutation , Pacific Ocean , Phylogeny , Selection, Genetic , Whole Genome SequencingABSTRACT
We report the largest specimen from the stromateoid family Nomeidae. The specimen, measuring 1283 mm total length unpreserved, was caught on hook and line from shore in Port Hueneme, California, USA in June 2019. Despite scavenging damage, the specimen was identified as a longfin cigarfish, Cubiceps paradoxus, using morphological characters and molecular techniques. This is the third record of C. paradoxus from California. We also provide an account of a previously unreported C. paradoxus collected off the US-Mexico Border in 1999 that was examined but not preserved.