College of Forensic Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi, 710061, China.
China National GeneBank, BGI-Shenzhen, Shenzhen, 518083, China.
Gigascience. 2016 Oct 26;5(1):47. doi: 10.1186/s13742-016-0151-4.
BACKGROUND: Geckos are among the most species-rich reptile groups and the sister clade to all other lizards and snakes. Geckos possess a suite of distinctive characteristics, including adhesive digits, nocturnal activity, hard, calcareous eggshells, and a lack of eyelids. However, one gecko clade, the Eublepharidae, appears to be the exception to most of these 'rules' and lacks adhesive toe pads, has eyelids, and lays eggs with soft, leathery eggshells. These differences make eublepharids an important component of any investigation into the underlying genomic innovations contributing to the distinctive phenotypes in 'typical' geckos. FINDINGS: We report high-depth genome sequencing, assembly, and annotation for a male leopard gecko, Eublepharis macularius (Eublepharidae). Illumina sequence data were generated from seven insert libraries (ranging from 170 to 20 kb), representing a raw sequencing depth of 136X from 303 Gb of data, reduced to 84X and 187 Gb after filtering. The assembled genome of 2.02 Gb was close to the 2.23 Gb estimated by k-mer analysis. Scaffold and contig N50 sizes of 664 and 20 kb, respectively, were comparable to the previously published Gekko japonicus genome. Repetitive elements accounted for 42 % of the genome. Gene annotation yielded 24,755 protein-coding genes, of which 93 % were functionally annotated. CEGMA and BUSCO assessment showed that our assembly captured 91 % (225 of 248) of the core eukaryotic genes, and 76 % of vertebrate universal single-copy orthologs. CONCLUSIONS: Assembly of the leopard gecko genome provides a valuable resource for future comparative genomic studies of geckos and other squamate reptiles.
背景:壁虎是物种最丰富的爬行动物群体之一,是所有其他蜥蜴和蛇的姐妹群。壁虎具有一系列独特的特征,包括粘性的脚趾、夜间活动、坚硬的钙质蛋壳和没有眼睑。然而,壁虎科的一个分支,睑虎科,似乎违反了大多数这些“规则”,它们没有粘性的脚趾垫,有眼睑,并且产下的卵具有柔软的革质蛋壳。这些差异使得睑虎科成为研究导致“典型”壁虎独特表型的潜在基因组创新的重要组成部分。
发现:我们报告了一只雄性豹纹壁虎(Eublepharis macularius,睑虎科)的高深度基因组测序、组装和注释。Illumina 序列数据来自七个插入文库(范围从 170 到 20 kb),代表来自 303 Gb 数据的 136X 的原始测序深度,过滤后减少到 84X 和 187 Gb。组装的 2.02 Gb 基因组接近通过 k-mer 分析估计的 2.23 Gb。支架和 contig N50 大小分别为 664 和 20 kb,与之前发表的日本壁虎基因组相当。重复元件占基因组的 42%。基因注释生成了 24,755 个编码蛋白质的基因,其中 93%具有功能注释。CEGMA 和 BUSCO 评估表明,我们的组装捕获了 91%(225 个中的 248 个)的核心真核生物基因和 76%的脊椎动物通用单拷贝同源基因。
结论:豹纹壁虎基因组的组装为未来对壁虎和其他有鳞目爬行动物的比较基因组研究提供了有价值的资源。
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