Ancherythroculter nigrocauda is a fish endemic to the upper areas of the Changjiang(Yangtze)River in China.Quantitative trait locus(QTL)mapping is a powerful tool to identify potential genes affecting traits of econom...Ancherythroculter nigrocauda is a fish endemic to the upper areas of the Changjiang(Yangtze)River in China.Quantitative trait locus(QTL)mapping is a powerful tool to identify potential genes affecting traits of economic importance in domestic animals.In this study,a high-density genetic map was constructed with 5901 single nucleotide polymorphism(SNP)makers by sequencing 92 individual fish from a F1 family using the specific-locus amplified fragment sequencing approach.Initially,48 QTLs for total length,body length,body height,and body weight were identified according to the high density of the genetic map with 24 LGs,a total length of 3839.4 cM,and marker spacing of about 0.82 cM.These QTLs explained 27.1%-49.9%of phenotypic variance.The results of this study suggest that major QTLs are responsible for the growth of A.nigrocauda,and these are potentially useful in comparative genomics research,genome assembly,and marker-assisted breeding programs for this species.展开更多
Myostatin （MSTN） is a member of the transforming growth factor-β gene superfamily that negatively regulates skeletal muscle development and growth. In the present study, partial genomic fragments of Myostatin-1 （M...Myostatin （MSTN） is a member of the transforming growth factor-β gene superfamily that negatively regulates skeletal muscle development and growth. In the present study, partial genomic fragments of Myostatin-1 （MSTN-1） in two commercial hatchery populations of Ancherythroculter nigrocauda, an economically important freshwater fish, were screened for single nucleotide polymorphisms （SNPs） and then genotyped by direct sequencing of PCR products. Five SNPs were identified in intron 1 and exon 2, including a non-synonymous mutation causing an amino acid change （Val to Ile） at position 180. Association analyses based on 300 individuals revealed that the g. 1129T〉C SNP locus was significantly associated with total length （TL）, body length （BL）, body height （BH） and body weight （BW） in 6- and 18-month-old populations, while the g. 1289G〉A locus was significantly associated with BH and BW in the 6-month-old population. Haplotype analyses revealed that fish with the genotype combinations TC/TC or TC/GA showed better growth performance. Our results suggest that g.l129T〉C and g.1289G〉A have positive effects on growth traits and may be candidate gene markers for marker-assisted selection in A. nigrocauda.展开更多
对人工驯化的黑尾近红鲌Anoherythroculter nigrocauda进行人工药物催情、产卵和孵化,并连续观察其胚胎发育全过程。结果表明：用激素PG＋HCG＋LRH-A2、HCG＋LRH-A2＋DOM、PG＋LRH-A2＋DOM、HCG＋LRH-A2组合催产,催产率均为100%,受精率...对人工驯化的黑尾近红鲌Anoherythroculter nigrocauda进行人工药物催情、产卵和孵化,并连续观察其胚胎发育全过程。结果表明：用激素PG＋HCG＋LRH-A2、HCG＋LRH-A2＋DOM、PG＋LRH-A2＋DOM、HCG＋LRH-A2组合催产,催产率均为100%,受精率为72.4%~97.9%,孵化率为63.8%~80.4%。黑尾近红鲌的胚胎发育时序和特征与斑马鱼Danio rerio相似,可分为7个时期。受精卵为黏性,呈淡黄色,圆形,直径为（0.94±0.05）mm。在水温为23.4~25.3℃条件下,受精卵经过25 min开始胚胎发育,45 min进入2细胞期,5 h 15 min进入囊胚期,7 h 25 min进入原肠期,10 h 15 min进入神经胚期,50 h 50%以上的仔鱼孵出。刚出膜的仔鱼体长为（4.10±0.02）mm。展开更多
基金Supported by the Technical Innovation Project of Hubei Province(No.2018ABA105)the Enterprise Technology Innovation Project of Wuhan(No.39 of 2019 WuKe)。
文摘Ancherythroculter nigrocauda is a fish endemic to the upper areas of the Changjiang(Yangtze)River in China.Quantitative trait locus(QTL)mapping is a powerful tool to identify potential genes affecting traits of economic importance in domestic animals.In this study,a high-density genetic map was constructed with 5901 single nucleotide polymorphism(SNP)makers by sequencing 92 individual fish from a F1 family using the specific-locus amplified fragment sequencing approach.Initially,48 QTLs for total length,body length,body height,and body weight were identified according to the high density of the genetic map with 24 LGs,a total length of 3839.4 cM,and marker spacing of about 0.82 cM.These QTLs explained 27.1%-49.9%of phenotypic variance.The results of this study suggest that major QTLs are responsible for the growth of A.nigrocauda,and these are potentially useful in comparative genomics research,genome assembly,and marker-assisted breeding programs for this species.
基金Supported by the National Science Foundation for Young Scientists of China(No.31402296)the National Science Foundation for Post-Doctoral Scientists of China(No.2014M562077)the Wuhan Chenguang Project for Young Scholars(No.201372304010832)
文摘Myostatin （MSTN） is a member of the transforming growth factor-β gene superfamily that negatively regulates skeletal muscle development and growth. In the present study, partial genomic fragments of Myostatin-1 （MSTN-1） in two commercial hatchery populations of Ancherythroculter nigrocauda, an economically important freshwater fish, were screened for single nucleotide polymorphisms （SNPs） and then genotyped by direct sequencing of PCR products. Five SNPs were identified in intron 1 and exon 2, including a non-synonymous mutation causing an amino acid change （Val to Ile） at position 180. Association analyses based on 300 individuals revealed that the g. 1129T〉C SNP locus was significantly associated with total length （TL）, body length （BL）, body height （BH） and body weight （BW） in 6- and 18-month-old populations, while the g. 1289G〉A locus was significantly associated with BH and BW in the 6-month-old population. Haplotype analyses revealed that fish with the genotype combinations TC/TC or TC/GA showed better growth performance. Our results suggest that g.l129T〉C and g.1289G〉A have positive effects on growth traits and may be candidate gene markers for marker-assisted selection in A. nigrocauda.
文摘对人工驯化的黑尾近红鲌Anoherythroculter nigrocauda进行人工药物催情、产卵和孵化,并连续观察其胚胎发育全过程。结果表明：用激素PG＋HCG＋LRH-A2、HCG＋LRH-A2＋DOM、PG＋LRH-A2＋DOM、HCG＋LRH-A2组合催产,催产率均为100%,受精率为72.4%~97.9%,孵化率为63.8%~80.4%。黑尾近红鲌的胚胎发育时序和特征与斑马鱼Danio rerio相似,可分为7个时期。受精卵为黏性,呈淡黄色,圆形,直径为（0.94±0.05）mm。在水温为23.4~25.3℃条件下,受精卵经过25 min开始胚胎发育,45 min进入2细胞期,5 h 15 min进入囊胚期,7 h 25 min进入原肠期,10 h 15 min进入神经胚期,50 h 50%以上的仔鱼孵出。刚出膜的仔鱼体长为（4.10±0.02）mm。
