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Science 22 March 1991:
Vol. 251. no. 5000, pp. 1488 - 1490
DOI: 10.1126/science.1672472
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Articles

Science, Vol 251, Issue 5000, 1488-1490
Copyright © 1991 by American Association for the Advancement of Science

articles

Heteroplasmy suggests limited biparental inheritance of Mytilus mitochondrial DNA

WR Hoeh, KH Blakley, and WM Brown

Laboratory for Molecular Systematics, Museum of Zoology, Ann Arbor, MI.

Strict maternal inheritance of mitochondrial DNA is commonly observed in animals. There is usually only one mitochondrial DNA population (homoplasmy) within an individual. Mussels of the Mytilus edulis species group appear to be exceptions in both respects. Of 150 Mytilus individuals examined, 85 were heteroplasmic. Mitochondrial DNA types within heteroplasmic individuals differed greatly; in one comparison, the inferred sequence difference was 20 +/- 5 percent. Homoplasmic individuals with mitochondrial DNA similar to the heteroplasmic mitochondrial DNA types were found. These observations are best explained by the hypothesis that biparental inheritance of mitochondrial DNA can occur in Mytilus.


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