Adaptive Evolution Leads to Cross-Species Incompatibility in the piRNA Transposon Silencing Machinery

作者：Parhad, Swapnil S.; Tu, Shikui; Weng, Zhiping^*; Theurkauf, William E.^*

来源：Developmental Cell, 2017, 43(1): 60-+.

DOI：10.1016/j.devcel.2017.08.012

• PIWI-INTERACTING RNA
• HISTONE H3
• LYSINE 9
• DROSOPHILA
• RHINO
• CLUSTERS
• PATHWAY
• COMPLEX
• BINDING
• BIOGENESIS

Reproductive isolation defines species divergence and is linked to adaptive evolution of hybrid incompatibility genes. Hybrids between Drosophila melanogaster and Drosophila simulans are sterile, and phenocopy mutations in the PIWI interacting RNA (piRNA) pathway, which silences transposons and shows pervasive adaptive evolution, and Drosophila rhino and deadlock encode rapidly evolving components of a complex that binds to piRNA clusters. We show that Rhino and Deadlock interact and colocalize in simulans and melanogaster, but simulans Rhino does not bind melanogaster Deadlock, due to substitutions in the rapidly evolving Shadow domain. Significantly, a chimera expressing the simulans Shadow domain in a melanogaster Rhino backbone fails to support piRNA production, disrupts binding to piRNA clusters, and leads to ectopic localization to bulk heterochromatin. Fusing melanogaster Deadlock to simulans Rhino, by contrast, restores localization to clusters. Deadlock binding thus directs Rhino to piRNA clusters, and Rhino-Deadlock co-evolution has produced cross-species incompatibilities,

• 出版日期2017-10-9
• 单位上海交通大学