title: Polymorphism in Mitochondrial Coding Regions of Mediterranean Loggerhead Turtles: Evolutionary Relevance and Structural Effects.
abstract: We sequenced coding portions (1.6 kb) of the mtDNA in 170 loggerhead (Caretta caretta) turtles sampled in the central Mediterranean. The sequences spanned the entire ND1 and ND3 genes, the tRNAGly and tRNAArg, plus the 3' and 5' termini of COXIII and ND4L genes, respectively. Based on our sequencing results and published complete mitogenomes, we constructed a maximum parsimony phylogeny of C. caretta matrilines that sheds new light on the evolutionary relationships within the collection of lineages found in the Mediterranean and so far recognized by D-loop haplotypes only. We show that the new variants are useful to understand the ancestry of extant haplotypes, to improve genetically based studies on the philopatry and migratory behavior of the species, and for conservation purposes. In order to better understand the biological significance of the observed variation, we addressed intraspecific nonsynonymous substitutions in the context of the three-dimensional modeled structures of ND1 and ND3. The positions of variant amino acids within the folded subunits are consistent with a coadaptation with the restructuring of membrane thickness, fluidity, and lipid composition, a well-known response mechanism to thermal conditions. The pattern of amino acid substitutions departs from neutrality, suggesting local adaptation and/or polymorphism-based local selection.
authors: Andrea
authors: A
authors: Novelletto
authors: Letizia
authors: L
authors: Testa
authors: Federico
authors: F
authors: Iacovelli
authors: Paola
authors: P
authors: Blasi
authors: Luisa
authors: L
authors: Garofalo
authors: Toni
authors: T
authors: Mingozzi
authors: Mattia
authors: M
authors: Falconi
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004272:DNA, Mitochondrial / Q000235:genetics*; D015971:Gene Expression Regulation, Enzymologic; D009245:NADH Dehydrogenase / Q000235:genetics / Q000378:metabolism; D011110:Polymorphism, Genetic; D014426:Turtles / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial; D009245:NADH Dehydrogenase
keywords: ND1 and ND3 coding genes; marine turtles; mtDNA phylogeny; protein structure; synonymous and nonsynonymous substitutions; thermal adaptation