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Science 24 November 2006:
Vol. 314. no. 5803, pp. 1292 - 1295
DOI: 10.1126/science.1133953
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Reports

Two Dobzhansky-Muller Genes Interact to Cause Hybrid Lethality in Drosophila

Nicholas J. Brideau,* Heather A. Flores,* Jun Wang,* Shamoni Maheshwari, Xu Wang, Daniel A. Barbash{dagger}

The Dobzhansky-Muller model proposes that hybrid incompatibilities are caused by the interaction between genes that have functionally diverged in the respective hybridizing species. Here, we show that Lethal hybrid rescue (Lhr) has functionally diverged in Drosophila simulans and interacts with Hybrid male rescue (Hmr), which has functionally diverged in D. melanogaster, to cause lethality in F1 hybrid males. LHR localizes to heterochromatic regions of the genome and has diverged extensively in sequence between these species in a manner consistent with positive selection. Rapidly evolving heterochromatic DNA sequences may be driving the evolution of this incompatibility gene.

Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: dab87{at}cornell.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)