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Single nucleotide polymorphisms in Cryptomeria japonica: their discovery and validation for genome mapping and diversity studies

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Abstract

In order to develop a large set of single-nucleotide polymorphisms (SNPs) in Cryptomeria japonica, for a wide range of applications, we adopted a systematic EST (expressed sequence tags) re-sequencing approach. We examined a group of four genotypes comprising parents of a mapping population as well as representatives of two main lines from natural populations. We sequenced 5,170 gene fragments, representing analysis of over 1.3 Mb of DNA sequences in C. japonica. This analysis leads to the discovery of 13,413 SNPs in 3,744 amplicons, with an average of one SNP for every 101.0 bp (one SNP for every 78.3 bp in introns and for every 106.7 bp in exon regions). Nucleotide diversity in C. japonica (π = 0.0045) was found to be similar to values recorded in highly polymorphic forest tree species such as pine. We also validated the use of the SNPs as molecular markers for genetic diversity studies using the high throughput SNP genotyping platform GoldenGate. From 1,536 candidate SNP sites tested, 1,164 (75.8 %) were confirmed to be polymorphic. We anticipate that the genome-wide SNP markers reported here will be useful for evaluating the species’ range-wide genetic structure and in marker-assisted selection used as part of the C. japonica tree improvement program.

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Acknowledgments

Authors would like to thank M. Yano, K. Ebana, and T. Shibaya at the QTL Genomics Research Center of the National Institute of Agrobiological Sciences for their technical advice on GoldenGate SNP genotyping and allowing us to use the bead array reader for GoldenGate SNP genotyping. We would also like to thank two anonymous reviewers for helpful comments. This research was supported by the Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry.

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Uchiyama, K., Ujino-Ihara, T., Ueno, S. et al. Single nucleotide polymorphisms in Cryptomeria japonica: their discovery and validation for genome mapping and diversity studies. Tree Genetics & Genomes 8, 1213–1222 (2012). https://doi.org/10.1007/s11295-012-0508-5

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