Laminaria and Saccharina have recently been recognized as two independent clades from the former genus Laminaria. Traditional morphological taxonomy is being challenged by molecular evidence from both nucleus and plas...Laminaria and Saccharina have recently been recognized as two independent clades from the former genus Laminaria. Traditional morphological taxonomy is being challenged by molecular evidence from both nucleus and plastid. Intensive work is in great demand from the perspective of genome colinearity. In this study, 118 sequence-tagged site(STS) markers were screened for phylogenetic analyses, 29 based on genome sequences, while 89 were based on expressed sequence tag(EST) sequences. EST-based STS marker development(29.37%) had an effi ciency twice as high as genome-sequence-based development(9.48%) as a result of high conservation of gene transcripts among the relative species. S. ochotensis, S. religiosa, S. japonica, and L. hyperborea showed great homogeneity in all 118 STS markers. Our result supports the view that the diversifi cation between the genera Saccharina and Laminaria was a more recent event and that Saccharina and Laminaria shared high phylogenetic affi nity. However, when it came to the single nucleotide polymorphism(SNP) level among the 41 SNPs, L. hyperborea owned 29 unique SNPs against 12 within the left three Saccharina species and 12 of the 13 indels were supposedly unique for L. hyperborea, indicated by its high variability. Originating from homologous ancestors, species between the recently diverged genera Laminaria and Saccharina may have taken in enough mutations at the SNP level only, in spite of different evolutionary strategies for better adaptation to the environment. Our study lays a solid foundation from a new perspective, although more accurate phylogenetic analysis is still needed to clarify the evolutionary traces between the genera Saccharina and Laminaria.展开更多
目的:对一个家族性高胆固醇血症样表型(FHLP)家系的易感基因突变位点进行鉴定,并分析蛋白三维结构。方法:该研究为病例系列研究。病例来源于北京安贞医院2019年4月4日门诊收治的一疑似家族性高胆固醇血症家系。通过全外显子测序,对先证...目的:对一个家族性高胆固醇血症样表型(FHLP)家系的易感基因突变位点进行鉴定,并分析蛋白三维结构。方法:该研究为病例系列研究。病例来源于北京安贞医院2019年4月4日门诊收治的一疑似家族性高胆固醇血症家系。通过全外显子测序,对先证者进行易感基因突变位点筛查,采用聚合酶链式反应对先证者亲属进行突变位点验证。通过Discovery Studio 4.0和PyMoL 2.0软件对突变前后蛋白的结构与功能进行分析和预测。结果:该家系患者表现为以总胆固醇(TC)升高为主要特征的血脂异常。易感基因筛查结果显示先证者及其父亲和弟弟在突变脂肪酶C(LIPC)基因的第8外显子存在一个杂合单核苷酸多态性位点LIPC:c.1330C>T,导致LIPC蛋白序列第444位的精氨酸(Arg)被半胱氨酸(Cys)替代(Arg444Cys)。该家系中携带该突变的成员表现为TC升高,而未携带该突变的先证者母亲血脂正常,提示LIPC:c.1330C>T可能是易感基因突变位点。蛋白质功能预测提示该突变主要影响其配体结合功能,对催化功能影响有限。结论:LIPC:c.1330C>T是新的FHLP易感基因突变位点。展开更多
基金Supported by the National High Technology Research and Development Program of China(863 Program)(No.2012AA10A406)the Science and Technology Development Project of Shandong Province,China(No.2006GG3205001)+2 种基金the National Basic Scientific Special Fund of the Ministry of Science and Technology,China(No.2007FY210500)the National Public Benefit Research Foundation of the State Bureau of Oceanography,China(No.200805075)the Research Fund for Basic Sciences of Higher Education by National Ministry of Finance and Education,China(No.201262003)
文摘Laminaria and Saccharina have recently been recognized as two independent clades from the former genus Laminaria. Traditional morphological taxonomy is being challenged by molecular evidence from both nucleus and plastid. Intensive work is in great demand from the perspective of genome colinearity. In this study, 118 sequence-tagged site(STS) markers were screened for phylogenetic analyses, 29 based on genome sequences, while 89 were based on expressed sequence tag(EST) sequences. EST-based STS marker development(29.37%) had an effi ciency twice as high as genome-sequence-based development(9.48%) as a result of high conservation of gene transcripts among the relative species. S. ochotensis, S. religiosa, S. japonica, and L. hyperborea showed great homogeneity in all 118 STS markers. Our result supports the view that the diversifi cation between the genera Saccharina and Laminaria was a more recent event and that Saccharina and Laminaria shared high phylogenetic affi nity. However, when it came to the single nucleotide polymorphism(SNP) level among the 41 SNPs, L. hyperborea owned 29 unique SNPs against 12 within the left three Saccharina species and 12 of the 13 indels were supposedly unique for L. hyperborea, indicated by its high variability. Originating from homologous ancestors, species between the recently diverged genera Laminaria and Saccharina may have taken in enough mutations at the SNP level only, in spite of different evolutionary strategies for better adaptation to the environment. Our study lays a solid foundation from a new perspective, although more accurate phylogenetic analysis is still needed to clarify the evolutionary traces between the genera Saccharina and Laminaria.
文摘目的:对一个家族性高胆固醇血症样表型(FHLP)家系的易感基因突变位点进行鉴定,并分析蛋白三维结构。方法:该研究为病例系列研究。病例来源于北京安贞医院2019年4月4日门诊收治的一疑似家族性高胆固醇血症家系。通过全外显子测序,对先证者进行易感基因突变位点筛查,采用聚合酶链式反应对先证者亲属进行突变位点验证。通过Discovery Studio 4.0和PyMoL 2.0软件对突变前后蛋白的结构与功能进行分析和预测。结果:该家系患者表现为以总胆固醇(TC)升高为主要特征的血脂异常。易感基因筛查结果显示先证者及其父亲和弟弟在突变脂肪酶C(LIPC)基因的第8外显子存在一个杂合单核苷酸多态性位点LIPC:c.1330C>T,导致LIPC蛋白序列第444位的精氨酸(Arg)被半胱氨酸(Cys)替代(Arg444Cys)。该家系中携带该突变的成员表现为TC升高,而未携带该突变的先证者母亲血脂正常,提示LIPC:c.1330C>T可能是易感基因突变位点。蛋白质功能预测提示该突变主要影响其配体结合功能,对催化功能影响有限。结论:LIPC:c.1330C>T是新的FHLP易感基因突变位点。
