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Score: 3.00
Title: Rice pollen hybrid incompatibility caused by reciprocal gene loss of duplicated genes .
Author: Mizuta Y Harushima Y Kurata N
Journal: Proc Natl Acad Sci U S A Citation: V : 107 P : 20417-22 Year: 2010 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub21048083 Accession (PMID): 21048083
Abstract: Genetic incompatibility is a barrier contributing to species isolation and is caused by genetic interactions . We made a whole genome survey of two-way interacting loci acting within the gametophyte or zygote using independence tests of marker segregations in an F ( 2 ) population from an intersubspecific cross between O sativa subspecies indica and japonica . We detected only one reproducible interaction , and identified paralogous hybrid incompatibility genes , DOPPELGANGER1 ( DPL1 ) and DOPPELGANGER2 ( DPL2 ) , by positional cloning . Independent disruptions of DPL1 and DPL2 occurred in indica and japonica , respectively . DPLs encode highly conserved , plant-specific small proteins ( approximately 10 kDa ) and are highly expressed in mature anther . Pollen carrying two defective DPL alleles became nonfunctional and did not germinate , suggesting an essential role for DPLs in pollen germination . Although rice has many duplicated genes resulting from ancient whole genome duplication , the origin of this gene duplication was in recent small-scale gene duplication , occurring after Oryza-Brachypodium differentiation . Comparative analyses suggested the geographic and phylogenetic distribution of these two defective alleles , showing that loss-of-function mutations of DPL1 genes emerged multiple times in indica and its wild ancestor , O rufipogon , and that the DPL2 gene defect is specific to japonica cultivars .
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[ Sen. 3, subscore: 1.00 ]: We detected only one reproducible interaction , and identified paralogous hybrid incompatibility genes , DOPPELGANGER1 ( DPL1 ) and DOPPELGANGER2 ( DPL2 ) , by positional cloning .
[ Sen. 4, subscore: 1.00 ]: Independent disruptions of DPL1 and DPL2 occurred in indica and japonica , respectively .
[ Sen. 8, subscore: 1.00 ]: Comparative analyses suggested the geographic and phylogenetic distribution of these two defective alleles , showing that loss-of-function mutations of DPL1 genes emerged multiple times in indica and its wild ancestor , O rufipogon , and that the DPL2 gene defect is specific to japonica cultivars .
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