Paleogenomic data suggest mammal-like genome size in the ancestral amniote and derived large genome size in amphibians. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Evolutionary Biology Année : 2011

Paleogenomic data suggest mammal-like genome size in the ancestral amniote and derived large genome size in amphibians.

Résumé

An unsolved question in evolutionary genomics is whether amniote genomes have been expanding or contracting since the common ancestor of this diverse group. Here, we report on the polarity of amniote genome size evolution using genome size estimates for 14 extinct tetrapod genera from the Paleozoic and early Mesozoic Eras using osteocyte lacunae size as a correlate. We find substantial support for a phylogenetically controlled regression model relating genome size to osteocyte lacunae size (P of slopes < 0.01, r2 = 0.65, phylogenetic signal (lambda) = 0.83). Genome size appears to have been homogeneous across Paleozoic crown-tetrapod lineages (average haploid genome size 2.9-3.7 pg) with values similar to those of extant mammals. The differentiation in genome size and underlying architecture among extant tetrapod lineages likely evolved in the Mesozoic and Cenozoic Eras, with expansion in amphibians, contractions along the diapsid lineage, and no directional change within the synapsid lineage leading to mammals.

Domaines

Paléontologie

Dates et versions

hal-00629003 , version 1 (04-10-2011)

Identifiants

Citer

C. Organ, A. Canoville, R.R. Reisz, M. Laurin. Paleogenomic data suggest mammal-like genome size in the ancestral amniote and derived large genome size in amphibians.. Journal of Evolutionary Biology, 2011, 24, pp.372-380. ⟨10.1111/j.1420-9101.2010.02176.x⟩. ⟨hal-00629003⟩
38 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More