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A molecular approach to understandin...

Vieyra, Michelle.

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A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection./
Author:	Vieyra, Michelle.
Description:	299 p.
Notes:	Adviser: Richard Vogt.
Contained By:	Dissertation Abstracts International67-07B.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3224483
ISBN:	9780542784231

A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection.
Vieyra, Michelle.

A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection. - 299 p.

Adviser: Richard Vogt.

Thesis (Ph.D.)--University of South Carolina, 2006.

Behavioral studies have shown that sea turtles react to odors under the water and in the air. This study employed a molecular cloning technique to isolate olfactory receptor genes from three species of sea turtle, two species of freshwater turtle, two land turtles and alligator. The importance of thirteen olfactory receptor genes in three species of sea turtle was then assessed by looking at allelic diversity across several populations of sea turtles and then testing for selection. 245 reptile odor receptor genes were found which were classified into 26 families. Psuedogene percentages ranged from 2% in the box turtle to 44% in leatherback sea turtles with a trend towards gene loss in aquatic turtles. Phylogenetic comparison of these genes to OR genes found in chicken and mouse have revealed some possible orthologs. Two groups of OR genes were found with remarkable sequence identity in two or more species of sea turtle. Based on allelic diversity and allele numbers compared to mitochondrial haplotype diversity and numbers found in sea turtles from the same populations, many of these genes appear to be functionally important. The two conserved genes showed very low diversity between species as compared to estimated mutation rates. All of the species specific genes without stop codon appeared to have some level of functional importance. Some of the pseudogenes appear to have some functional importance as well based on low allelic diversity. Overall most of the selection found was positive selection which is consistent with findings in other vertebrates. Purifying selection was found in the two conserved genes as expected based on conservation with other vertebrate OR genes and allelic diversity. Purifying selection is an indication of the functional importance of a gene and positive selection might indicate the importance of a particular family of genes. Given the low levels of allelic diversity and evidence for selection it appears that olfaction is important to sea turtles.

ISBN: 9780542784231Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection.
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245 1 2 $a A molecular approach to understanding the importance of olfaction in the life history of sea turtles: Turtle olfactory receptor gene phylogeny, allelic diversity and evidence for selection.
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500 $a Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3533.
502 $a Thesis (Ph.D.)--University of South Carolina, 2006.
520 $a Behavioral studies have shown that sea turtles react to odors under the water and in the air. This study employed a molecular cloning technique to isolate olfactory receptor genes from three species of sea turtle, two species of freshwater turtle, two land turtles and alligator. The importance of thirteen olfactory receptor genes in three species of sea turtle was then assessed by looking at allelic diversity across several populations of sea turtles and then testing for selection. 245 reptile odor receptor genes were found which were classified into 26 families. Psuedogene percentages ranged from 2% in the box turtle to 44% in leatherback sea turtles with a trend towards gene loss in aquatic turtles. Phylogenetic comparison of these genes to OR genes found in chicken and mouse have revealed some possible orthologs. Two groups of OR genes were found with remarkable sequence identity in two or more species of sea turtle. Based on allelic diversity and allele numbers compared to mitochondrial haplotype diversity and numbers found in sea turtles from the same populations, many of these genes appear to be functionally important. The two conserved genes showed very low diversity between species as compared to estimated mutation rates. All of the species specific genes without stop codon appeared to have some level of functional importance. Some of the pseudogenes appear to have some functional importance as well based on low allelic diversity. Overall most of the selection found was positive selection which is consistent with findings in other vertebrates. Purifying selection was found in the two conserved genes as expected based on conservation with other vertebrate OR genes and allelic diversity. Purifying selection is an indication of the functional importance of a gene and positive selection might indicate the importance of a particular family of genes. Given the low levels of allelic diversity and evidence for selection it appears that olfaction is important to sea turtles.
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