从新组装的双峰驼基因组估计种群突变率,并与单峰驼ESTs进行跨物种比较。
Estimating the population mutation rate from a de novo assembled Bactrian camel genome and cross-species comparison with dromedary ESTs.
作者信息
Burger Pamela A, Palmieri Nicola
机构信息
From the Institut für Populationsgenetik, Vetmeduni Vienna, Veterinärplatz 1, 1210 Wien, Austria/Europe
出版信息
J Hered. 2014 Nov-Dec;105(6):839-46. doi: 10.1093/jhered/est005. Epub 2013 Mar 1.
The Bactrian camel (Camelus bactrianus) and the dromedary (Camelus dromedarius) are among the last species that have been domesticated around 3000-6000 years ago. During domestication, strong artificial (anthropogenic) selection has shaped the livestock, creating a huge amount of phenotypes and breeds. Hence, domestic animals represent a unique resource to understand the genetic basis of phenotypic variation and adaptation. Similar to its late domestication history, the Bactrian camel is also among the last livestock animals to have its genome sequenced and deciphered. As no genomic data have been available until recently, we generated a de novo assembly by shotgun sequencing of a single male Bactrian camel. We obtained 1.6 Gb genomic sequences, which correspond to more than half of the Bactrian camel's genome. The aim of this study was to identify heterozygous single-nucleotide polymorphisms (SNPs) and to estimate population parameters and nucleotide diversity based on an individual camel. With an average 6.6-fold coverage, we detected over 116 000 heterozygous SNPs and recorded a genome-wide nucleotide diversity similar to that of other domesticated ungulates. More than 20 000 (85%) dromedary expressed sequence tags successfully aligned to our genomic draft. Our results provide a template for future association studies targeting economically relevant traits and to identify changes underlying the process of camel domestication and environmental adaptation.
双峰驼(Camelus bactrianus)和单峰驼(Camelus dromedarius)是约3000至6000年前被驯化的最后一批物种。在驯化过程中,强烈的人工(人为)选择塑造了这些家畜,产生了大量的表型和品种。因此,家畜是理解表型变异和适应的遗传基础的独特资源。与较晚的驯化历史相似,双峰驼也是最后一批进行基因组测序和解码的家畜之一。直到最近都没有可用的基因组数据,我们通过对一头雄性双峰驼进行鸟枪法测序生成了一个从头组装序列。我们获得了1.6Gb的基因组序列,相当于双峰驼基因组的一半以上。本研究的目的是识别杂合单核苷酸多态性(SNP),并基于单个骆驼估计群体参数和核苷酸多样性。平均覆盖度为6.6倍,我们检测到超过116000个杂合SNP,并记录了全基因组核苷酸多样性,与其他家养有蹄类动物相似。超过20000个(85%)单峰驼表达序列标签成功比对到我们的基因组草图上。我们的结果为未来针对经济相关性状的关联研究以及识别骆驼驯化和环境适应过程中的潜在变化提供了一个模板。