Although a growing number of both sequence-based and microsatellite nuclear loci have been used to infer genetic structures, their relative efficiencies remain poorly understood. In our study, we used the Green-backed...Although a growing number of both sequence-based and microsatellite nuclear loci have been used to infer genetic structures, their relative efficiencies remain poorly understood. In our study, we used the Green-backed Tit (Parus monticolus) to explore the resolving ability of these two types of markers. The south-western and central mitochondrial DNA (mtDNA) phylogroups were divergent to some extent in sequence-based nuclear data, while mixed together in microsatellites data. The F ST values among clades were about four times lower in microsatellite loci than those in sequence-based nuclear loci. We are of the opinion that size homoplasy may have contributed to the inability of microsatellites to uncover differentiation. Our results suggest that sequence-based nuclear loci outperformed microsatellite loci in detecting population structures, especially those focused on populations with large effective population sizes. There was no significant correlation between F ST values and allelic size variability, which suggested that the efficiency of microsatellite loci in detecting genetic structure may be independent of their polymorphism. F ST is better than R ST in detecting intraspecific divergence due to the high variance of R ST . In agreement with sequence-based nuclear loci, microsatellite loci did resolve the genetic distinctness of the Taiwan Residents phylogroup. The genetic differentiation between the Taiwan Residents and continental clades may involve allopatric divergence without gene flow.展开更多
沼泽山雀是一种广域分布物种,目前关于该物种的微卫星位点信息较少.高通量测序技术因其获得微卫星序列更加低廉、高效而逐渐被用于微卫星筛选当中.实验选取Illumina Mi Seq高通量测序平台对沼泽山雀简化基因组进行了测序,共得到2.84M读...沼泽山雀是一种广域分布物种,目前关于该物种的微卫星位点信息较少.高通量测序技术因其获得微卫星序列更加低廉、高效而逐渐被用于微卫星筛选当中.实验选取Illumina Mi Seq高通量测序平台对沼泽山雀简化基因组进行了测序,共得到2.84M读长,共开发113 519个SLAF标签;利用MISA对所得的112 558条有效序列进行微卫星片段搜索,最终成功搜索出2 471个微卫星位点,总分布密度为870.07个/M.大量的微卫星位点为微卫星的进一步筛选提供了丰富的材料,有利于沼泽山雀后续遗传学水平方面的研究.展开更多
基金supported by the National Science Fund for Distinguished Young Scientists (No. 30925008)the Major International (Regional) Joint Research Project (No. 31010103901)+1 种基金the CAS-IOZ Innovation Program (KSCX2-EW-J-2) by a grant (No. O529YX5105) from the Key Laboratory of the Zoological Systematics and Evolution of the Chinese Academy of Sciences to F.M. Lei
文摘Although a growing number of both sequence-based and microsatellite nuclear loci have been used to infer genetic structures, their relative efficiencies remain poorly understood. In our study, we used the Green-backed Tit (Parus monticolus) to explore the resolving ability of these two types of markers. The south-western and central mitochondrial DNA (mtDNA) phylogroups were divergent to some extent in sequence-based nuclear data, while mixed together in microsatellites data. The F ST values among clades were about four times lower in microsatellite loci than those in sequence-based nuclear loci. We are of the opinion that size homoplasy may have contributed to the inability of microsatellites to uncover differentiation. Our results suggest that sequence-based nuclear loci outperformed microsatellite loci in detecting population structures, especially those focused on populations with large effective population sizes. There was no significant correlation between F ST values and allelic size variability, which suggested that the efficiency of microsatellite loci in detecting genetic structure may be independent of their polymorphism. F ST is better than R ST in detecting intraspecific divergence due to the high variance of R ST . In agreement with sequence-based nuclear loci, microsatellite loci did resolve the genetic distinctness of the Taiwan Residents phylogroup. The genetic differentiation between the Taiwan Residents and continental clades may involve allopatric divergence without gene flow.
