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Genome-wide analysis of microsatellite sequence in seven filamentous fungi

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Abstract

Abundance of microsatellites with repeated unit lengths of 1-6 base pairs in seven fungi: Aspergillus nidulans, Coprinus cinereus, Cryptococcus neoformans (serotype A), Fusarium graminearum, Magnaporthe grisea, Neurospora crassa and Ustilago maydis were investigated on genomic scale. The results showed that each species has its specific profile for different types and different motifs of SSR loci. Ascomycetes fungi M. grisea, N. crassa and basidiomycete fungus U. maydis adopt much more microsatellites than other fungi examined. Total amount of 15,751, 14,788 and 6,854 SSR loci were observed respectively, average density is 406, 389 and 347 per Mbp sequence; overall length of SSR sequence was 0.82%, 0.95% and 0.79% of genomic sequence respectively. While ascomycetes fungus F. graminearum and A. nidulans contains the least SSRs in the genomic DNA, only 4,679 and 4,837 tracts were observed in 36 Mb and 30 Mb genomic sequence respectively. Microsatellite repeats in protein coding regions are investigated in Aspergillus nidulans, Magnaporthe grisea, and Neurospora crassa also, the results show that the difference of different types and motifs among three fungi is very little than that in whole genomic sequence. For trinucleotide repeats, overrepresent (comparing to the total base pair of protein coding region) of AGC, GGC, AGG, ACG and ACC was observed in coding region, frequencies of AAC and AAG were not difference between coding and non-coding region, AAT, AGT and ATG were underrepresent in coding region excepted for A. nidulans, in which ATG was overrepresentative.

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Authors and Affiliations

  1. Key Laboratory for Agricultural Biodiversity and Pest Management of China Education Ministry, Yunnan Agricultural University, Heilongtan, Kunming, Yunnan Province, 650201, P.R. China

    Cheng-Yun Li, Lin Liu, Jing Yang, Jin-Bin Li, Yuan Su, Yue Zhang, Yun-Yue Wang & You-Yong Zhu

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  1. Cheng-Yun Li
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  2. Lin Liu
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  3. Jing Yang
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Correspondence to Cheng-Yun Li.

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Li, CY., Liu, L., Yang, J. et al. Genome-wide analysis of microsatellite sequence in seven filamentous fungi. Interdiscip Sci Comput Life Sci 1, 141–150 (2009). https://doi.org/10.1007/s12539-009-0014-5

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  • DOI: https://doi.org/10.1007/s12539-009-0014-5

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