旨在从牛发情周期第一卵泡波中最大卵泡ODF1(The largest follicle at onset of deviation)和第二大卵泡ODF2(The second largest follicle at onset of deviation)转录组水平上筛选卵泡发育差异表达基因。采集牛发情周期第一卵泡波ODF1...旨在从牛发情周期第一卵泡波中最大卵泡ODF1(The largest follicle at onset of deviation)和第二大卵泡ODF2(The second largest follicle at onset of deviation)转录组水平上筛选卵泡发育差异表达基因。采集牛发情周期第一卵泡波ODF1和ODF2,分别分离颗粒细胞并提取总RNA,构建RNA文库,通过Illumina平台对ODF1和ODF2测序;筛选出ODF1与ODF2两个转录本之间比值大于2的差异表达基因,并采用qRT-PCR对筛选出的基因在牛发情周期内第一卵泡波优势卵泡(Dominant follicles,DF)和从属卵泡(Subordinate follicles,SF)颗粒细胞中功能验证。共获得8个卵泡发育差异表达基因,其中7个基因筛选自ODF1/ODF2(BEX2、UBN1、SIK1、SPARCL1、LOC784256、LOC789231和LOC785462),1个筛选自ODF2/ODF1(SAFB2);qRT-PCR结果表明,BEX2、UBN1、LOC784256和LOC789231在DF中mRNA表达量极显著高于SF(P<0.01),SAFB2在SF中mRNA表达量极显著高于DF(P<0.01),SIK1和SPARCL1在SF中mRNA表达量显著高于DF(P<0.05),虽然LOC785462在SF中mRNA表达量高于DF,但差异不显著(P>0.05)。qRT-PCR检测BEX2、UBN1、LOC784256、LOC789231和SAFB2的结果与高通量测序中该基因在ODF1和ODF2的RPKM的差异趋势基本一致,而SIK1、SPARCL1和LOC785462不一致。展开更多
Numerous genes have been associated with multiple morphological abnormalities of the sperm flagella(MMAF),which cause severe asthenozoospermia and lead to male infertility,while the causes of approximately 50%of MMAF ...Numerous genes have been associated with multiple morphological abnormalities of the sperm flagella(MMAF),which cause severe asthenozoospermia and lead to male infertility,while the causes of approximately 50%of MMAF cases remain unclear.To reveal the genetic causes of MMAF in an infertile patient,whole-exome sequencing was performed to screen for pathogenic genes,and electron microscope was used to reveal the sperm flagellar ultrastructure.A novel heterozygous missense mutation in the outer dense fiber protein 2(ODF2)gene was detected,which was inherited from the patient’s mother and predicted to be potentially damaging.Transmission electron microscopy revealed that the outer dense fibers were defective in the patient’s sperm tail,which was similar to that of the reported heterozygous Odf2 mutation mouse.Immunostaining of ODF2 showed severe ODF2 expression defects in the patient’s sperm.Therefore,it was concluded that the heterozygous mutation in ODF2 caused MMAF in this case.To evaluate the possibility of assisted reproductive technology(ART)treatment for this patient,intracytoplasmic sperm injection(ICSI)was performed,with the help of a hypo-osmotic swelling test and laser-assisted immotile sperm selection(LAISS)for available sperm screening,and artificial oocyte activation with ionomycin was applied to improve the fertilization rate.Four ICSI cycles were performed,and live birth was achieved in the LAISS-applied cycle,suggesting that LAISS would be valuable in ART treatment for MMAF.展开更多
This article uses a real-life example to illustrate the concept and methodology of recombineering, arevolutionary genetic engineering technique based on phage-mediated homologous recombination. A step-by-step approach...This article uses a real-life example to illustrate the concept and methodology of recombineering, arevolutionary genetic engineering technique based on phage-mediated homologous recombination. A step-by-step approach is presented along with a flow diagram, from obtaining gene-harboring BACs to the in vitro generation of a conditional null allele. This method can be used to target any gene at any position, without the knowledge or use of any restriction site. The extensive applicability of recombineering to gene manipulation is discussed.展开更多
文摘旨在从牛发情周期第一卵泡波中最大卵泡ODF1(The largest follicle at onset of deviation)和第二大卵泡ODF2(The second largest follicle at onset of deviation)转录组水平上筛选卵泡发育差异表达基因。采集牛发情周期第一卵泡波ODF1和ODF2,分别分离颗粒细胞并提取总RNA,构建RNA文库,通过Illumina平台对ODF1和ODF2测序;筛选出ODF1与ODF2两个转录本之间比值大于2的差异表达基因,并采用qRT-PCR对筛选出的基因在牛发情周期内第一卵泡波优势卵泡(Dominant follicles,DF)和从属卵泡(Subordinate follicles,SF)颗粒细胞中功能验证。共获得8个卵泡发育差异表达基因,其中7个基因筛选自ODF1/ODF2(BEX2、UBN1、SIK1、SPARCL1、LOC784256、LOC789231和LOC785462),1个筛选自ODF2/ODF1(SAFB2);qRT-PCR结果表明,BEX2、UBN1、LOC784256和LOC789231在DF中mRNA表达量极显著高于SF(P<0.01),SAFB2在SF中mRNA表达量极显著高于DF(P<0.01),SIK1和SPARCL1在SF中mRNA表达量显著高于DF(P<0.05),虽然LOC785462在SF中mRNA表达量高于DF,但差异不显著(P>0.05)。qRT-PCR检测BEX2、UBN1、LOC784256、LOC789231和SAFB2的结果与高通量测序中该基因在ODF1和ODF2的RPKM的差异趋势基本一致,而SIK1、SPARCL1和LOC785462不一致。
基金supported by grant from the National Key Research and Development Program of China(No.2017YFC1002003).
文摘Numerous genes have been associated with multiple morphological abnormalities of the sperm flagella(MMAF),which cause severe asthenozoospermia and lead to male infertility,while the causes of approximately 50%of MMAF cases remain unclear.To reveal the genetic causes of MMAF in an infertile patient,whole-exome sequencing was performed to screen for pathogenic genes,and electron microscope was used to reveal the sperm flagellar ultrastructure.A novel heterozygous missense mutation in the outer dense fiber protein 2(ODF2)gene was detected,which was inherited from the patient’s mother and predicted to be potentially damaging.Transmission electron microscopy revealed that the outer dense fibers were defective in the patient’s sperm tail,which was similar to that of the reported heterozygous Odf2 mutation mouse.Immunostaining of ODF2 showed severe ODF2 expression defects in the patient’s sperm.Therefore,it was concluded that the heterozygous mutation in ODF2 caused MMAF in this case.To evaluate the possibility of assisted reproductive technology(ART)treatment for this patient,intracytoplasmic sperm injection(ICSI)was performed,with the help of a hypo-osmotic swelling test and laser-assisted immotile sperm selection(LAISS)for available sperm screening,and artificial oocyte activation with ionomycin was applied to improve the fertilization rate.Four ICSI cycles were performed,and live birth was achieved in the LAISS-applied cycle,suggesting that LAISS would be valuable in ART treatment for MMAF.
文摘This article uses a real-life example to illustrate the concept and methodology of recombineering, arevolutionary genetic engineering technique based on phage-mediated homologous recombination. A step-by-step approach is presented along with a flow diagram, from obtaining gene-harboring BACs to the in vitro generation of a conditional null allele. This method can be used to target any gene at any position, without the knowledge or use of any restriction site. The extensive applicability of recombineering to gene manipulation is discussed.
