1. S. Sun, C. T. Ting and C. I. Wu (2004) The normal function of a speciation gene, Odysseus, and its hybrid sterility effect. Science 305(5680): 81-3.
Abstract To understand how postmating isolation is connected to the normal process of species divergence and why hybrid male sterility is often the first sign of speciation, we analyzed the Odysseus (OdsH) gene of hybrid male sterility in Drosophila. We carried out expression analysis, transgenic study, and gene knockout. The combined evidence suggests that the sterility phenotype represents a novel manifestation of the gene function rather than the reduction or loss of the normal one. The gene knockout experiment identified the normal function of OdsH as a modest enhancement of sperm production in young males. The implication of a weak effect of OdsH on the normal phenotype but a strong influence on hybrid male sterility is discussed in light of Haldane's rule of postmating isolation. PMID: [15232104]
2. J. J. Bayes and H. S. Malik (2009) Altered heterochromatin binding by a hybrid sterility protein in Drosophila sibling species. Science 326(5959): 1538-41.
Abstract Hybrid sterility of the heterogametic sex is one of the first postzygotic reproductive barriers to evolve during speciation, yet the molecular basis of hybrid sterility is poorly understood. We show that the hybrid male sterility gene Odysseus-site homeobox (OdsH) encodes a protein that localizes to evolutionarily dynamic loci within heterochromatin and leads to their decondensation. In Drosophila mauritiana x Drosophila simulans male hybrids, OdsH from D. mauritiana (OdsHmau) acts as a sterilizing factor by associating with the heterochromatic Y chromosome of D. simulans, whereas D. simulans OdsH (OdsHsim) does not. Characterization of sterile hybrid testes revealed that OdsH abundance and localization in the premeiotic phases of spermatogenesis differ between species. These results reveal that rapid heterochromatin evolution affects the onset of hybrid sterility. PMID: [19933102]
Figures for illustrating the function of this protein/gene
Ref: J. J. Bayes and H. S. Malik (2009) Altered heterochromatin binding by a hybrid sterility protein in Drosophila sibling species. Science 326(5959): 1538-41. PMID: [19933102]
Ref: J. J. Bayes and H. S. Malik (2009) Altered heterochromatin binding by a hybrid sterility protein in Drosophila sibling species. Science 326(5959): 1538-41. PMID: [19933102]
Ref: J. J. Bayes and H. S. Malik (2009) Altered heterochromatin binding by a hybrid sterility protein in Drosophila sibling species. Science 326(5959): 1538-41. PMID: [19933102]
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