Diener A C, Fink G R
Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142-1479, USA.
Genetics. 1996 Jun;143(2):769-76. doi: 10.1093/genetics/143.2.769.
DMC1/LIM15 homologue 1 (DLH1), a gene related to meiosis-specific genes, has been isolated from Candida albicans, a fungus thought not to undergo meiosis. The deduced protein sequence of DLH1 contains 74% amino acid identity with Dmc1p from Saccharomyces cerevisiae and 63% with Lim15p from the plant Lilium longiflorum, meiosis-specific homologues of Escherichia coli RecA. Candida DLH1 complements a dmc1/dmc1 null mutant in S. cerevisiae. High copy expression of DLH1 restores both sporulation and meiotic recombination to a Saccharomyces dmc1 delta/dmc1 delta strain. Unlike the DMC1 gene, which is transcribed only in meiotic cells, the heterologous Candida DLH1 gene is transcribed in both vegetative and meiotic cells of S. cerevisiae. Transcription of DLH1 is not detected or induced in C. albicans under conditions that induce DMC1 and meiosis in S. cerevisiae. The presence of an intact homologue of a meiosis-specific gene in C. albicans raises the possibility that this organism has a cryptic meiotic pathway.
DMC1/LIM15同源物1(DLH1)是一种与减数分裂特异性基因相关的基因,已从白色念珠菌中分离出来,白色念珠菌是一种被认为不会进行减数分裂的真菌。DLH1推导的蛋白质序列与酿酒酵母的Dmc1p有74%的氨基酸同一性,与植物麝香百合的Lim15p有63%的氨基酸同一性,Lim15p是大肠杆菌RecA的减数分裂特异性同源物。白色念珠菌的DLH1可互补酿酒酵母中的dmc1/dmc1缺失突变体。DLH1的高拷贝表达可使酿酒酵母的dmc1Δ/dmc1Δ菌株恢复孢子形成和减数分裂重组。与仅在减数分裂细胞中转录的DMC1基因不同,异源的白色念珠菌DLH1基因在酿酒酵母的营养细胞和减数分裂细胞中均有转录。在酿酒酵母中诱导DMC1和减数分裂的条件下,未检测到白色念珠菌中DLH1的转录,也未诱导其转录。白色念珠菌中存在减数分裂特异性基因的完整同源物,这增加了该生物体具有隐秘减数分裂途径的可能性。