An extended 5-generation family has been investigated in which 32 of the 111 family members were diagnosed as having retinitis pigmentosa (RP) The proband was a 58-year old male in whom night-blindness was first obs...An extended 5-generation family has been investigated in which 32 of the 111 family members were diagnosed as having retinitis pigmentosa (RP) The proband was a 58-year old male in whom night-blindness was first observed in early childhood, with almost loss of vision by 52 years of age The symptoms observed in other family members included night-blindness, impaired vision and visual field loss Dementia, digital abnormalities, deaf-mutism and mental retardation were variously diagnosed in a number of individuals with RP The affected and unaffected family members were tested for mutations in a range of candidate genes The 8 exons of three candidate genes have been analyzed by polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing techniques A novel mutation was identified in the rhodopsin gene at codon 52 of exon 1 (TTC-TAC) that resulted in a substitution of Phe to Tyr展开更多
【目的】菌株MIM37为具有两种光能利用途径的光合异养细菌,分析其基因组和光照对生长的影响,为理解光能利用途径、光营养生物多样性以及光合作用的进化和功能等提供线索。【方法】采用平板涂布划线法分离菌株,结合形态观察及16S r RNA...【目的】菌株MIM37为具有两种光能利用途径的光合异养细菌,分析其基因组和光照对生长的影响,为理解光能利用途径、光营养生物多样性以及光合作用的进化和功能等提供线索。【方法】采用平板涂布划线法分离菌株,结合形态观察及16S r RNA基因和光合基因序列同源性与系统发育分析进行初步分类鉴定;以分光光度法和荧光显微观察法测定光照和黑暗培养下培养液细胞浓度和单细胞体积;构建片段长度为300-500 bp的Illumina PE文库,以Illumina Hiseq2000进行基因组测序,以SOAPdenovo和Gap Closer组装序列,以RAST在线软件注释基因组。【结果】从内蒙古腾格里沙漠天鹅湖表层水中分离获得一株细菌MIM37,经16S r RNA基因、puf M和视紫质基因同源性和系统发育分析均显示其与Sphingomonas属亲缘关系最为密切;相对黑暗培养,光照刺激下的最大细胞浓度和单细胞体积大小分别提高了1.2和5.6倍;基因组注释显示MIM37代谢途径多样,含典型好氧菌的呼吸电子传递链,具有完整的好氧不产氧细菌的光合基因簇及Xanthorhodopsin-like视紫质蛋白基因,合成铁载体,还原重金属,降解微囊藻毒素和多环芳烃类等。【结论】MIM37属于Sphingomonas属,具有两种光能利用途径,光照可明显促进其生长,多样的代谢模式可能使其在自然环境中极具竞争力、分布广泛并具有应用于修复环境污染的潜力。展开更多
文摘An extended 5-generation family has been investigated in which 32 of the 111 family members were diagnosed as having retinitis pigmentosa (RP) The proband was a 58-year old male in whom night-blindness was first observed in early childhood, with almost loss of vision by 52 years of age The symptoms observed in other family members included night-blindness, impaired vision and visual field loss Dementia, digital abnormalities, deaf-mutism and mental retardation were variously diagnosed in a number of individuals with RP The affected and unaffected family members were tested for mutations in a range of candidate genes The 8 exons of three candidate genes have been analyzed by polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and DNA sequencing techniques A novel mutation was identified in the rhodopsin gene at codon 52 of exon 1 (TTC-TAC) that resulted in a substitution of Phe to Tyr
文摘【目的】菌株MIM37为具有两种光能利用途径的光合异养细菌,分析其基因组和光照对生长的影响,为理解光能利用途径、光营养生物多样性以及光合作用的进化和功能等提供线索。【方法】采用平板涂布划线法分离菌株,结合形态观察及16S r RNA基因和光合基因序列同源性与系统发育分析进行初步分类鉴定;以分光光度法和荧光显微观察法测定光照和黑暗培养下培养液细胞浓度和单细胞体积;构建片段长度为300-500 bp的Illumina PE文库,以Illumina Hiseq2000进行基因组测序,以SOAPdenovo和Gap Closer组装序列,以RAST在线软件注释基因组。【结果】从内蒙古腾格里沙漠天鹅湖表层水中分离获得一株细菌MIM37,经16S r RNA基因、puf M和视紫质基因同源性和系统发育分析均显示其与Sphingomonas属亲缘关系最为密切;相对黑暗培养,光照刺激下的最大细胞浓度和单细胞体积大小分别提高了1.2和5.6倍;基因组注释显示MIM37代谢途径多样,含典型好氧菌的呼吸电子传递链,具有完整的好氧不产氧细菌的光合基因簇及Xanthorhodopsin-like视紫质蛋白基因,合成铁载体,还原重金属,降解微囊藻毒素和多环芳烃类等。【结论】MIM37属于Sphingomonas属,具有两种光能利用途径,光照可明显促进其生长,多样的代谢模式可能使其在自然环境中极具竞争力、分布广泛并具有应用于修复环境污染的潜力。
