First Evidence of Higher Female Recombination in a Species with Temperature-Dependent Sex Determination: the Saltwater Crocodile | Zendy

Sally R. Isberg | Zendy; Scott Maxwell Johnston | Zendy; Yizhou Chen | Zendy; Christopher Moran | Zendy

Open Access

First Evidence of Higher Female Recombination in a Species with Temperature-Dependent Sex Determination: the Saltwater Crocodile

Author(s) -

Sally R. Isberg,

Scott Maxwell Johnston,

Yizhou Chen,

Christopher Moran

Publication year - 2006

Publication title -

journal of heredity

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 92

eISSN - 1471-8505

pISSN - 0022-1503

DOI - 10.1093/jhered/esl035

Subject(s) - biology , recombination , locus (genetics) , microsatellite , linkage (software) , genetic linkage , crocodile , sex linkage , genetics , gene , ecology , allele , chromosome

The first evidence of genetic linkage and sex-specific recombination in the order Crocodylia is reported. This study was conducted using a resource pedigree of saltwater crocodiles consisting of 16 known-breeding pairs (32 adults) and 101 juveniles. A total of 21 microsatellite loci were available for analysis. Ten of the 21 loci showed linkage with 4 linkage groups: 3 pairwise (Cj131/Cj127, CUD68/Cj101, and Cj107/Cp10) and 1 four-locus (Cj122, CUD78, Cj16, and Cj104) being found. Linkage analysis on the 21 loci revealed evidence of sex-specific differences in recombination rates. All 5 nonzero interlocus intervals were longer in females than in males, with the 4-loci linkage group 3-fold longer in females than in males (41.63 cM and 14.1 cM, respectively). This is the first report of sex-specific recombination rates in a species that exhibits temperature-dependent sex determination.

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