Dataset Information

Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards.

ABSTRACT: Squamates include all lizards and snakes, and display some of the most diverse and extreme morphological adaptations among vertebrates. However, compared with birds and mammals, relatively few resources exist for comparative genomic analyses of squamates, hampering efforts to understand the molecular bases of phenotypic diversification in such a speciose clade. In particular, the ?400 species of anole lizard represent an extensive squamate radiation. Here, we sequence and assemble the draft genomes of three anole species-Anolis frenatus, Anolis auratus, and Anolis apletophallus-for comparison with the available reference genome of Anolis carolinensis. Comparative analyses reveal a rapid background rate of molecular evolution consistent with a model of punctuated equilibrium, and strong purifying selection on functional genomic elements in anoles. We find evidence for accelerated evolution in genes involved in behavior, sensory perception, and reproduction, as well as in genes regulating limb bud development and hindlimb specification. Morphometric analyses of anole fore and hindlimbs corroborated these findings. We detect signatures of positive selection across several genes related to the development and regulation of the forebrain, hormones, and the iguanian lizard dewlap, suggesting molecular changes underlying behavioral adaptations known to reinforce species boundaries were a key component in the diversification of anole lizards.

SUBMITTER: Tollis M

PROVIDER: S-EPMC5798147 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards.

Tollis Marc M Hutchins Elizabeth D ED Stapley Jessica J Rupp Shawn M SM Eckalbar Walter L WL Maayan Inbar I Lasku Eris E Infante Carlos R CR Dennis Stuart R SR Robertson Joel A JA May Catherine M CM Crusoe Michael R MR Bermingham Eldredge E DeNardo Dale F DF Hsieh Shi-Tong Tonia ST Kulathinal Rob J RJ McMillan William Owen WO Menke Douglas B DB Pratt Stephen C SC Rawls Jeffery Alan JA Sanjur Oris O Wilson-Rawls Jeanne J Wilson Sayres Melissa A MA Fisher Rebecca E RE Kusumi Kenro K

Genome biology and evolution 20180201 2

Squamates include all lizards and snakes, and display some of the most diverse and extreme morphological adaptations among vertebrates. However, compared with birds and mammals, relatively few resources exist for comparative genomic analyses of squamates, hampering efforts to understand the molecular bases of phenotypic diversification in such a speciose clade. In particular, the ∼400 species of anole lizard represent an extensive squamate radiation. Here, we sequence and assemble the draft geno ...[more]

PMID: 29360978

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Project description:BackgroundRecent advances in the accumulation of genetic mapping and DNA sequence information from several salmonid species support the long standing view of an autopolyploid origin of these fishes (i.e., 4R). However, the paralogy relationships of the chromosomal segments descendent from earlier polyploidization events (i.e., 2R/3R) largely remain unknown, mainly due to an unbalanced pseudogenization of paralogous genes that were once resident on the ancient duplicated segments. Inter-specific conserved noncoding elements (CNE) might hold the key in identifying these regions, if they are associated with arrays of genes that have been highly conserved in syntenic blocks through evolution. To test this hypothesis, we investigated the chromosomal positions of subset of CNE in the rainbow trout genome using a comparative genomic framework.ResultsThrough a genome wide analysis, we selected 41 pairs of adjacent CNE located on various chromosomes in zebrafish and obtained their intervening, less conserved, sequence information from rainbow trout. We identified 56 distinct fragments corresponding to about 150 Kbp of sequence data that were localized to 67 different chromosomal regions in the rainbow trout genome. The genomic positions of many duplicated CNE provided additional support for some previously suggested homeologies in this species. Additionally, we now propose 40 new potential paralogous affinities by analyzing the variation in the segregation patterns of some multi-copy CNE along with the synteny association comparison using several model vertebrates. Some of these regions appear to carry signatures of the 1R, 2R or 3R duplications. A subset of these CNE markers also demonstrated high utility in identifying homologous chromosomal segments in the genomes of Atlantic salmon and Arctic charr.ConclusionCNE seem to be more efficacious than coding sequences in providing insights into the ancient paralogous affinities within the vertebrate genomes. Such a feature makes these elements extremely attractive for comparative genomics studies, as they can be treated as 'anchor' markers to investigate the association of distally located candidate genes on the homologous genomic segments of closely or distantly related organisms.

Dataset Information

Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards.

Publications

Comparative Genomics Reveals Accelerated Evolution in Conserved Pathways during the Diversification of Anole Lizards.

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