Bioinformatic mining of EST-SSR loci in the Pacific oyster, Crassostrea gigas.

Bioinformatic mining of EST-SSR loci in the Pacific oyster, Crassostrea gigas.
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太平洋牡蛎巨牡蛎 EST-SSR 位点的生物信息挖掘。

DOI:
10.1111/j.1365-2052.2008.01701.x
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发表时间:
2008-06
期刊:
影响因子:
2.4
通讯作者:
--
中科院分区:
生物学3区
文献类型:
--
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通过对GenBank公共数据库的生物信息挖掘,开发了一套太平洋牡蛎(Crassostrea gigas)的EST-SSR标记。截至2007年6月30日,共从GenBank中下载了5132个EST序列,并筛选了二,三和四核苷酸重复序列,标准分别为最小5,4和4个重复序列的三种类型的SSR。17个多态性微卫星标记进行了表征。等位基因数在3 ~ 10个之间,观察杂合度在0.125 ~ 0.770之间,期望杂合度在0.113 ~ 0.732之间。11个位点处于Hardy-Weinberg平衡(HWE),其余6个位点与HWE的偏离极显著(P < 0.01),提示可能存在无效等位基因。两两连锁不平衡检验表明,136对位点中有11对位点的连锁不平衡显著(P < 0.01),可能是由于单个标记存在HWE。对其他5种牡蛎进行了跨种扩增,得到了合理的结果,这些标记在牡蛎遗传学研究中有很好的应用前景。
A set of expressed sequence tag-simple sequence repeat (EST-SSR) markers of the Pacific oyster, Crassostrea gigas, was developed through bioinformatic mining of the GenBank public database. As of June 30, 2007, a total of 5132 EST sequences from GenBank were downloaded and screened for di-, tri- and tetra-nucleotide repeats, with criteria set at a minimum of 5, 4 and 4 repeats for the three categories of SSRs respectively. Seventeen polymorphic microsatellite markers were characterized. Allele numbers ranged from 3 to 10, and the observed and expected heterozygosity values varied from 0.125 to 0.770 and from 0.113 to 0.732 respectively. Eleven loci were at Hardy-Weinberg equilibrium (HWE); the other six loci showed significant departure from HWE (P < 0.01), suggesting possible presence of null alleles. Pairwise check of linkage disequilibrium (LD) indicated that 11 of 136 pairs of loci showed significant LD (P < 0.01), likely due to HWE present in single markers. Cross-species amplification was examined for five other Crassostrea species and reasonable results were obtained, promising usefulness of these markers in oyster genetics.
DOI: 10.1046/j.1471-8286.2003.00406.x
发表时间: 2003-06-01
期刊: MOLECULAR ECOLOGY NOTES
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发表时间: 2005-09
期刊: Molecular Ecology Notes
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