An RNA Recognition Motif-Containing Protein Functions in Meiotic Silencing by Unpaired DNA.

An RNA Recognition Motif-Containing Protein Functions in Meiotic Silencing by Unpaired DNA.
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DOI:
10.1534/g3.117.041848
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发表时间:
2017-08-07
期刊:
G3 (Bethesda, Md.)
影响因子:
--
通讯作者:
Hammond TM
Hammond TM
中科院分区:
其他
文献类型:
--
作者:
Samarajeewa DA;Manitchotpisit P;Henderson M;Xiao H;Rehard DG;Edwards KA;Shiu PKT;Hammond TM

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未配对DNA减数分裂沉默(MSUD)是一种生物学过程,它在同源染色体(homologs)对中寻找未配对的DNA片段。在未配对片段中发现的基因在减数分裂期间沉默。在本报告中,我们描述了粗神经孢子虫sad-7的鉴定和特征,该基因编码具有RNA识别基序(RRM)的蛋白质。sad-7的同源物广泛存在于子囊菌真菌中。在N. crassa中,sad-7是对未配对基因完全有效的MSUD反应所必需的。此外,杂交产生子囊孢子必须至少有一个亲本具有功能性的sad-7等位基因。虽然sad-7-null杂交是不育的,但sad-7Δ菌株以野生型(wt)的速度生长,在营养生长条件下表现正常。在表达方面,sad-7在早期营养培养中处于基线水平,在交配能力培养中水平略高,在交配过程中处于最高水平。这些发现表明,SAD-7是交配能力强和性文化特有的。尽管SAD-7在MSUD中的作用尚不清楚,但基于绿色荧光蛋白(GFP)的标记研究发现,SAD-7位于减数分裂细胞的细胞核、核周区域和细胞质病灶内。这种定位模式在已知的MSUD蛋白中是独一无二的,并提出了SAD-7协调MSUD核、核周和细胞质方面的可能性。
Meiotic silencing by unpaired DNA (MSUD) is a biological process that searches pairs of homologous chromosomes (homologs) for segments of DNA that are unpaired. Genes found within unpaired segments are silenced for the duration of meiosis. In this report, we describe the identification and characterization of Neurospora crassa sad-7, a gene that encodes a protein with an RNA recognition motif (RRM). Orthologs of sad-7 are found in a wide range of ascomycete fungi. In N. crassa, sad-7 is required for a fully efficient MSUD response to unpaired genes. Additionally, at least one parent must have a functional sad-7 allele for a cross to produce ascospores. Although sad-7-null crosses are barren, sad-7Δ strains grow at a wild-type (wt) rate and appear normal under vegetative growth conditions. With respect to expression, sad-7 is transcribed at baseline levels in early vegetative cultures, at slightly higher levels in mating-competent cultures, and is at its highest level during mating. These findings suggest that SAD-7 is specific to mating-competent and sexual cultures. Although the role of SAD-7 in MSUD remains elusive, green fluorescent protein (GFP)-based tagging studies place SAD-7 within nuclei, perinuclear regions, and cytoplasmic foci of meiotic cells. This localization pattern is unique among known MSUD proteins and raises the possibility that SAD-7 coordinates nuclear, perinuclear, and cytoplasmic aspects of MSUD.
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