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The Journal of Heredity 2000:91(2)
© 2000 The American Genetic Association 91:146-149

Brief communication. Heteroplasmy of mitochondrial DNA in the iphiuroid Astrobrachion constrictum

DJ Steel, SA Trewick, and GP Wallis*

Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand *Corresponding author E-mail: graham.wallis@stonebow.otago.ac.nz

We demonstrate the presence of mitochondrial heteroplasmy for the cytochrome oxidase I (COI) gene of the brittle star (Astrobrachion constrictum. One of the 117 individuals analyzed contained two distinct single-strand conformation polymorphism (SSCP) haplotypes differing by two substitutions; another showed sequence evidence for heteroplasmy. We used polymerase chain reaction (PCR) cloning, SSCP, and sequencing of a 480 bp region of the 5' end of COI to isolate and characterize these haplotypes. This is the first properly substantiated case of heteroplasmy in an echinoderm species and may have arisen from paternal leakage.


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