Multilocus genotypic data reveal high genetic diversity and low population genetic structure of Iranian indigenous sheep

文献类型： 外文期刊

第一作者： Vahidi, S. M. F.

作者： Vahidi, S. M. F.;Afraz, F.;Mousavi, S. M.;Faruque, M. O.;Anbaran, M. Falahati;Anbaran, M. Falahati;Boettcher, P.;Joost, S.;Han, J. L.;Colli, L.;Periasamy, K.;Negrini, R.

作者机构：

关键词： gene flow;genetic differentiation;Iranian sheep;microsatellite marker

期刊名称：ANIMAL GENETICS （ 影响因子：3.169； 五年影响因子：3.058 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Iranian livestock diversity is still largely unexplored, in spite of the interest in the populations historically reared in this country located near the Fertile Crescent, a major livestock domestication centre. In this investigation, the genetic diversity and differentiation of 10 Iranian indigenous fat-tailed sheep breeds were investigated using 18 microsatellite markers. Iranian breeds were found to host a high level of diversity. This conclusion is substantiated by the large number of alleles observed across loci (average 13.83, range 7-22) and by the high within-breed expected heterozygosity (average 0.75, range 0.72-0.76). Iranian sheep have a low level of genetic differentiation, as indicated by the analysis of molecular variance, which allocated a very small proportion (1.67%) of total variation to the between-population component, and by the small fixation index (F-ST=0.02). Both Bayesian clustering and principal coordinates analysis revealed the absence of a detectable genetic structure. Also, no isolation by distance was observed through comparison of genetic and geographical distances. In spite of high within-breed variation, signatures of inbreeding were detected by the F-IS indices, which were positive in all and statistically significant in three breeds. Possible factors explaining the patterns observed, such as considerable gene flow and inbreeding probably due to anthropogenic activities in the light of population management and conservation programmes, are discussed.

分类号： Q953

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