SNP markers retrieval for a non-model species: A practical approach

被引：23

作者：

Arwa Shahin

Thomas van Gurp

Sander A Peters

Richard GF Visser

Jaap M van Tuyl

Paul Arens

机构：

[1] Wageningen University and Research Centre, Plant Breeding, 6700 AJ Wageningen

[2] Wageningen University and Research Centre, Bioscience, 6700 AJ Wageningen

[3] Netherlands Institute of Ecology (NIOO-KNAW), Department of Terrestrial Ecology, 6700 AB Wageningen

来源：

BMC Research Notes | / 5卷 / 1期

关键词：

Assembly Quality; CAP3 Assembly; Transcriptome Size; Redundant Contigs; Illumina Golden Gate;

D O I：

10.1186/1756-0500-5-79

中图分类号：

学科分类号：

摘要：

Background: SNP (Single Nucleotide Polymorphism) markers are rapidly becoming the markers of choice for applications in breeding because of next generation sequencing technology developments. For SNP development by NGS technologies, correct assembly of the huge amounts of sequence data generated is essential. Little is known about assembler's performance, especially when dealing with highly heterogeneous species that show a high genome complexity and what the possible consequences are of differences in assemblies on SNP retrieval. This study tested two assemblers (CAP3 and CLC) on 454 data from four lily genotypes and compared results with respect to SNP retrieval. Results: CAP3 assembly resulted in higher numbers of contigs, lower numbers of reads per contig, and shorter average read lengths compared to CLC. Blast comparisons showed that CAP3 contigs were highly redundant. Contrastingly, CLC in rare cases combined paralogs in one contig. Redundant and chimeric contigs may lead to erroneous SNPs. Filtering for redundancy can be done by blasting selected SNP markers to the contigs and discarding all the SNP markers that show more than one blast hit. Results on chimeric contigs showed that only four out of 2,421 SNP markers were selected from chimeric contigs. Conclusion: In practice, CLC performs better in assembling highly heterogeneous genome sequences compared to CAP3, and consequently SNP retrieval is more efficient. Additionally a simple flow scheme is suggested for SNP marker retrieval that can be valid for all non-model species. © 2012 Shahin et al; licensee BioMed Central Ltd.

引用

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