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Int. J. Mol. Sci. 2012, 13(12), 16333-16345; doi:10.3390/ijms131216333

Large-Scale Isolation of Microsatellites from Chinese Mitten Crab Eriocheir sinensis via a Solexa Genomic Survey

1
Key laboratory of Freshwater Aquatic Genetic Resources Certificated by Ministry of Agriculture, College of Life Science, Shanghai Ocean University, 999 Hucheng Huan Road, Shanghai 201306, China
2
Jiangsu Animal Husbandry & Veterinary College, Jiangsu 225300, China
3
College of Life Science, East China Normal University, Shanghai 200062, China
*
Author to whom correspondence should be addressed.
Received: 26 September 2012 / Revised: 14 November 2012 / Accepted: 21 November 2012 / Published: 3 December 2012
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Abstract

Microsatellites are simple sequence repeats with a high degree of polymorphism in the genome; they are used as DNA markers in many molecular genetic studies. Using traditional methods such as the magnetic beads enrichment method, only a few microsatellite markers have been isolated from the Chinese mitten crab Eriocheir sinensis, as the crab genome sequence information is unavailable. Here, we have identified a large number of microsatellites from the Chinese mitten crab by taking advantage of Solexa genomic surveying. A total of 141,737 SSR (simple sequence repeats) motifs were identified via analysis of 883 Mb of the crab genomic DNA information, including mono-, di-, tri-, tetra-, penta- and hexa-nucleotide repeat motifs. The number of di-nucleotide repeat motifs was 82,979, making this the most abundant type of repeat motif (58.54%); the second most abundant were the tri-nucleotide repeats (42,657, 30.11%). Among di-nucleotide repeats, the most frequent repeats were AC motifs, accounting for 67.55% of the total number. AGG motifs were the most frequent (59.32%) of the tri-nucleotide motifs. A total of 15,125 microsatellite loci had a flanking sequence suitable for setting the primer of a polymerase chain reaction (PCR). To verify the identified SSRs, a subset of 100 primer pairs was randomly selected for PCR. Eighty two primer sets (82%) produced strong PCR products matching expected sizes, and 78% were polymorphic. In an analysis of 30 wild individuals from the Yangtze River with 20 primer sets, the number of alleles per locus ranged from 2–14 and the mean allelic richness was 7.4. No linkage disequilibrium was found between any pair of loci, indicating that the markers were independent. The Hardy-Weinberg equilibrium test showed significant deviation in four of the 20 microsatellite loci after sequential Bonferroni corrections. This method is cost- and time-effective in comparison to traditional approaches for the isolation of microsatellites. View Full-Text
Keywords: microsatellite marker; Eriocheir sinensis; solexa sequencing microsatellite marker; Eriocheir sinensis; solexa sequencing
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Xiong, L.-W.; Wang, Q.; Qiu, G.-F. Large-Scale Isolation of Microsatellites from Chinese Mitten Crab Eriocheir sinensis via a Solexa Genomic Survey. Int. J. Mol. Sci. 2012, 13, 16333-16345.

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