为了探究Sdf1-Cxcr4信号在斑马鱼(Danio rerio)后侧线系统(Posterior lateral line system,PLLs)发育中的作用,本研究首先通过原位杂交发现斑马鱼cxcr4b在迁移的侧线原基-Ⅰ和原基-Ⅱ中表达,sdf1a在原基迁移路径上表达。进一步构建了由...为了探究Sdf1-Cxcr4信号在斑马鱼(Danio rerio)后侧线系统(Posterior lateral line system,PLLs)发育中的作用,本研究首先通过原位杂交发现斑马鱼cxcr4b在迁移的侧线原基-Ⅰ和原基-Ⅱ中表达,sdf1a在原基迁移路径上表达。进一步构建了由热激启动子控制的cxcr7b过表达转基因斑马鱼,在不同时间点过表达cxcr7b抑制Sdf1-Cxcr4信号。结果表明:相较于野生型斑马鱼,过表达cxcr7b的斑马鱼的原基-Ⅰ和原基-Ⅱ的迁移明显减慢。但体侧中线神经丘的腹部迁移、间生和针脚神经丘的形成不受过表达cxcr7b的影响。本研究为理解鱼类侧线系统发育调控和多样性产生奠定基础。展开更多
Objective:The aim in this study was to identify the allelic frequencies of the chemokine (SDF1-3'A) and chemokine receptor (CCR5△32, CCR5m303 and CCR2-64I) genes resistant to HIV-1 infection and/or disease progre...Objective:The aim in this study was to identify the allelic frequencies of the chemokine (SDF1-3'A) and chemokine receptor (CCR5△32, CCR5m303 and CCR2-64I) genes resistant to HIV-1 infection and/or disease progression in indigenous Chinese populations. Methods: By using QIAamp DNA Blood Mini Kit, the genomic DNA samples were purified from whole peripheral blood of healthy individuals (n=2067) from Han, Uygur, Mongolian and Tibetan ethnic groups, as well as Han patients including HIV-1 carriers (n=330), patients with other sexually transmitted diseases (STDs, n=259) and intravenous drug users (IVDUs, n=125). The allelic polymorphisms were identified by means of PCR or PCR-RFLP analyses. The sequences of randomly selected amplified PCR products were further confirmed by direct DNA sequencing. Results: The mutant frequencies were identified to be 0%-3.48% for CCR5△32, 0% for CCR5m303,19.15%-28.79% for CCR2-64 and 19.10%-28.73% for SDF1-3'A alleles, respectively, in Chinese healthy individuals from four ethnic groups. Our findings indicated the allelic frequencies vary among the different ethnic groups. Furthermore, the HIV-1 carriers, STD cases and IVDUs (all of Han ethnicity) were found to have the allelic frequencies of 0%-0.19% (CCR5A32), 0% (CCR5m303), 19.31%-20.45% (CCR2-64) and 25.61%-26.83% (SDF1-3'A) with minor variations in their frequencies between the patients and healthy Han groups. There was no CCR5-m303 mutation found in any subject in this study. Conclusion: The examined subjects of four Chinese ethnic origins showed lower frequencies of CCR5A32 and CCR5m303 alleles, but higher frequencies of mutant CCR264I and SDF1-3'A alleles compared to those identified in northern-European and American Caucasians. The significance of the different frequencies and polymorphisms of the above alleles in Chinese populations needs to be further examined in HIV-1/AIDS diseases.展开更多
文摘为了探究Sdf1-Cxcr4信号在斑马鱼(Danio rerio)后侧线系统(Posterior lateral line system,PLLs)发育中的作用,本研究首先通过原位杂交发现斑马鱼cxcr4b在迁移的侧线原基-Ⅰ和原基-Ⅱ中表达,sdf1a在原基迁移路径上表达。进一步构建了由热激启动子控制的cxcr7b过表达转基因斑马鱼,在不同时间点过表达cxcr7b抑制Sdf1-Cxcr4信号。结果表明:相较于野生型斑马鱼,过表达cxcr7b的斑马鱼的原基-Ⅰ和原基-Ⅱ的迁移明显减慢。但体侧中线神经丘的腹部迁移、间生和针脚神经丘的形成不受过表达cxcr7b的影响。本研究为理解鱼类侧线系统发育调控和多样性产生奠定基础。
基金This project was supported by grant from National Natural Sciences Foundation of the PR China(39770683)
文摘Objective:The aim in this study was to identify the allelic frequencies of the chemokine (SDF1-3'A) and chemokine receptor (CCR5△32, CCR5m303 and CCR2-64I) genes resistant to HIV-1 infection and/or disease progression in indigenous Chinese populations. Methods: By using QIAamp DNA Blood Mini Kit, the genomic DNA samples were purified from whole peripheral blood of healthy individuals (n=2067) from Han, Uygur, Mongolian and Tibetan ethnic groups, as well as Han patients including HIV-1 carriers (n=330), patients with other sexually transmitted diseases (STDs, n=259) and intravenous drug users (IVDUs, n=125). The allelic polymorphisms were identified by means of PCR or PCR-RFLP analyses. The sequences of randomly selected amplified PCR products were further confirmed by direct DNA sequencing. Results: The mutant frequencies were identified to be 0%-3.48% for CCR5△32, 0% for CCR5m303,19.15%-28.79% for CCR2-64 and 19.10%-28.73% for SDF1-3'A alleles, respectively, in Chinese healthy individuals from four ethnic groups. Our findings indicated the allelic frequencies vary among the different ethnic groups. Furthermore, the HIV-1 carriers, STD cases and IVDUs (all of Han ethnicity) were found to have the allelic frequencies of 0%-0.19% (CCR5A32), 0% (CCR5m303), 19.31%-20.45% (CCR2-64) and 25.61%-26.83% (SDF1-3'A) with minor variations in their frequencies between the patients and healthy Han groups. There was no CCR5-m303 mutation found in any subject in this study. Conclusion: The examined subjects of four Chinese ethnic origins showed lower frequencies of CCR5A32 and CCR5m303 alleles, but higher frequencies of mutant CCR264I and SDF1-3'A alleles compared to those identified in northern-European and American Caucasians. The significance of the different frequencies and polymorphisms of the above alleles in Chinese populations needs to be further examined in HIV-1/AIDS diseases.
