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MBE Advance Access published online on April 25, 2003
Molecular Biology and Evolution, doi:10.1093/molbev/msg117
Molecular Biology and Evolution © Society for Molecular Biology and Evolution 2003; all rights reserved
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Accepted March 4, 2003
© 2003 Society for Molecular Biology and Evolution

Original Articles

Repetitive Sequences in the Crocodilian Mitochondrial Control Region: Poly-A Sequences and Heteroplasmic Tandem Repeats

David A. Ray 1* Llewellyn D. Densmore 1

1 Department of Biological Sciences, MS3131, Texas Tech University, Lubbock, TX, 79409

* To whom correspondence should be addressed. E-mail: daray{at}lsu.edu.


  Abstract

Heteroplasmic tandem repeats in the mitochondrial control region have been documented in a wide variety of vertebrate species. We have examined the control region from eleven species in the family Crocodylidae and identified two different types of heteroplasmic repetitive sequences in the conserved sequence block (CSB) domain - an extensive poly-A tract that appears to be involved in the formation of secondary structure and a series of tandem repeats located downstream ranging from ~50 to ~80 bp in length. We describe this portion of the crocodylian control region in detail and focus on members of the family Crocodylidae. We then address the origins of the tandemly repeated sequences in this family and suggest hypotheses to explain possible mechanisms of expansion/contraction of the sequences. We have also examined control region sequences from Alligator and Caiman and offer hypotheses for the origin of tandem repeats found in those taxa. Finally, we present a brief analysis of intra- and interindividual haplotype variation by examining representatives of Morelet's crocodile (Crocodylus moreletii).

Key Words: heteroplasmy, Crocodylus, mitochondrial control region, VNTR, Crocodylia


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