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【目的】研究半滑舌鳎(Cynoglossussemilaevis)gata5基因(csgata5)的序列特征及该基因在半滑舌鳎性腺分化、成熟过程中的表达模式。【方法】通过克隆获得csgata5编码区序列,利用荧光定量PCR(RT-qPCR)方法检测csgata5 mRNA在不同类型性腺、胚胎和性腺发育中的表达模式,借助原位杂交技术定位csgata5 mRNA表达的细胞类型。【结果】克隆获得csgata5 cDNA序列1 777 bp,包含1 167 bp的编码区(Coding sequence,CDS),262 bp的5′UTR和348 bp的3′UTR区,预测csgata5编码388个氨基酸残基(aa),分子质量为41.9 ku,等电点为8.90,在C端含有两个典型的GATA锌指结构域;基因组分析显示csgata5位于半滑舌鳎10号染色体上,包含7个外显子和6个内含子区。RT-qPCR分析显示csgata5 mRNA在2龄雄鱼和伪雄鱼精巢中表达高于卵巢;csgata5m RNA主要定位在卵母细胞、精原细胞和精子中。胚胎发育过程中,csgata5m RNA表达在1细胞期至囊胚期呈下降趋势,之后上升,至原肠胚期达到峰值,随后降低并维持较低水平至孵化出膜。在精巢发育过程中,csgata5m RNA表达水平呈升高趋势,在1龄达到检测的峰值;在卵巢发育过程中,csgata5m RNA表达趋势类似精巢,表达水平低于同期精巢。【结论】csgata5参与半滑舌鳎原肠胚期的组织器官分化,具有促进原始生殖细胞向雄性生殖细胞分化及雄性生殖细胞发育的作用。 相似文献
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In recent years, Edwardsiella tarda has become one of the most deadly pathogens of Japanese flounder (Paralichthys olivaceus), causing serious annual losses in commercial production. In contrast to the rapid advances in the aquaculture of P. olivaceus, the study of E. tarda resistance-related markers has lagged behind, hindering the development of a disease-resistant strain. Thus, a marker-trait association analysis was initiated, combining bulked segregant analysis (BSA) and quantitative trait loci (QTL) mapping. Based on 180 microsatellite loci across all chromosomes, 106 individuals from the F1333 (♀: F0768 ×♂: F0915) (Nomenclature rule: F+year+family number) were used to detect simple sequence repeats (SSRs) and QTLs associated with E. tarda resistance. After a genomic scan, three markers (Scaffold 404-21589, Scaffold 404-21594 and Scaffold 270-13812) from the same linkage group (LG)-1 exhibited a significant difference between DNA, pooled/bulked from the resistant and susceptible groups (P <0.001). Therefore, 106 individuals were genotyped using all the SSR markers in LG1 by single marker analysis. Two different analytical models were then employed to detect SSR markers with different levels of significance in LG1, where 17 and 18 SSR markers were identified, respectively. Each model found three resistance-related QTLs by composite interval mapping (CIM). These six QTLs, designated qE1–6, explained 16.0%–89.5% of the phenotypic variance. Two of the QTLs, qE-2 and qE-4, were located at the 66.7 cM region, which was considered a major candidate region for E. tarda resistance. This study will provide valuable data for further investigations of E. tarda resistance genes and facilitate the selective breeding of disease-resistant Japanese flounder in the future. 相似文献
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某航电枢纽库区右侧临近废弃煤矿,库区淹没线范围内存在废弃老窑采空区及煤硐,航电枢纽蓄水后,库水可能通过出露煤硐及岸坡岩体裂隙向采空区渗漏,影响库区正常蓄水。通过调查测绘、工程地质钻探、工程物探(高密度电法)等多种工程勘察方法查明了煤层、采空区及煤硐的分布位置,制定并实施了废弃煤硐注浆封堵、防渗帷幕与防渗挡墙相结合的防护方案。通过试验验证了防渗工程的有效性,保证了库区正常蓄水的安全,对于类似的工程具有一定的借鉴意义。 相似文献
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