Analysis of genetic variability within and among Italian sheep breeds reveals population stratification and suggests the presence of a phylogeographic gradient

Ciani, Elena; Ciampolini, Roberta; D’Andrea, Mariasilvia; Castellana, E.; Cecchi, Francesca; Incoronato, C.; D’Angelo, Francesca; Albenzio, Marzia; Pilla, Fabio; Matassino, D.; Cianci, D.

doi:10.1016/j.smallrumres.2012.12.013

Cited by 30 publications

(24 citation statements)

References 32 publications

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“…These values were higher than those reported in other species such as cattle Also within-breed mean coancestry and Kinship distances show that both populations are homogeneous; in fact, the values observed in our study for fij and for Fi were clearly greater than that reported in literature on other species such as horse (Marletta et al, 2006), sheep (Dalvit et al, 2008(Dalvit et al, , 2009D'Angelo et al, 2009;Ciani et al, 2013) and cattle (Cecchi et al, 2012), while Dk was smaller than reported in literature. The observed values might suggest that the low level of genetic variability have arisen as a possible consequence of mating among relatives.…”

Section: Resultscontrasting

confidence: 86%

“…This value reveals that 15.8% of the genetic variation observed in the sample is explained by population differences, whereas the remaining is due to the differences within population. This value is generally higher than those observed in studies carried out on European donkey breeds (AranguresMendez et al, 2002;Ivankovich et al, 2002;Bordonaro et al, 2012;Colli et al, 2013) and in other species such as for example Italian horse breed (Di Stasio et al, 2008), Italian cattle breeds (Cecchi et al, 2012), and Italian sheep breeds (Ciani et al, 2013).…”

Section: Resultsmentioning

confidence: 54%

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Genetic Diversity and Variability in two Italian Autochthonous Donkey Genetic Types Assessed by Microsatellite Markers

Matassino¹,

Cecchi

Ciani³

et al. 2014

Italian Journal of Animal Science

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Since 13 rd century, Italian domestic autochthonous donkey population has been characterised by Mediterranean grey mousy cruciate ancestral phenotype, currently typical of Amiata donkey (AD) genetic type. This phenotype persisted up to the 16 th century when a marked introduction of Hispanic and French big sized and dark bay or darkish coloured sires occurred. In the context of a safeguard programme of Latial Equide resources, the aim of this research was to evaluate the genetic diversity and similarity between the AD breed and an autochthonous donkey population native from Lazio, the Viterbese donkey (VD), using molecular markers. A total of 135 animals (50 AD and 85 VD) were genetically characterised by using 16 short tandem repeat markers. A high genetic differentiation between populations (FST=0.158; P<0.01) and a low betweenbreeds genetic similarity (0.233±0.085) were observed. Correspondence analysis, the result of STRUCTURE software analysis and analysis of molecular variance would seem to indicate genetically different entities as well. It would be desirable to increase the number of comparison with other breeds to better understand the origin of VD. Moreover, results obtained in this study suggest that the loss of genetic variation observed in VD could mainly derive from unnoticed sub-population structuring (Wahlund effect), rather than to other factors such as inbreeding, null alleles or selection influence.

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Section: Resultscontrasting

confidence: 86%

Section: Resultsmentioning

confidence: 54%

Genetic Diversity and Variability in two Italian Autochthonous Donkey Genetic Types Assessed by Microsatellite Markers

Matassino¹,

Cecchi

Ciani³

et al. 2014

Italian Journal of Animal Science

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“…These south and mid Wales types are clearly split on the dendrogram from the North Wales and Pedigree groups, again with a defined split between these other two populations. This reflects similar findings made in Italian sheep breeds by Ciani et al (2013), where along with clear interbreed differences, significant intrabreed diversity was observed within the Lecce breed of sheep.…”

Section: Discussionsupporting

confidence: 89%

Assessment of genetic relationship between six populations of Welsh Mountain sheep using microsatellite markers

Huson¹,

Haresign²,

Hegarty³

et al. 2015

CZECH J ANIM SCI

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This study investigated the genetic relationship between 6 populations of Welsh Mountain sheep: 5 phenotypic breed-types within the Welsh Mountain (WM) sheep breed, which have each been bred in specific geographic areas of Wales, and the Black Welsh Mountain sheep breed. Based on DNA analysis using 8 microsatellite markers, observed heterozygosity levels were similar to those expected in livestock populations subjected to selective breeding (0.530-0.664), and all but one population showed evidence of inbreeding. Using Bayesian cluster and Neighbor-joining analyses, the Black Welsh Mountain sheep were identified as being the outlier group, and the remaining groups could be categorized into five distinct sub-populations, which reflects the geographical separation seen between these populations.

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“…The program estimates, using multiple loci genotypes to assign individuals to populations, individual mix proportions and deducts the number of parental populations (K) for a given sample. As suggested by several authors, the analysis included a mixture model with correlated allele frequencies (Pritchard et al, 2000;Zuccaro et al, 2008;Ciani et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity of Colombian sheep by microsatellite markers

Ocampo

Cardona

Martínez

2016

Chilean J. Agric. Res.

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Analysis of genetic variability within and among Italian sheep breeds reveals population stratification and suggests the presence of a phylogeographic gradient

Cited by 30 publications

References 32 publications

Genetic Diversity and Variability in two Italian Autochthonous Donkey Genetic Types Assessed by Microsatellite Markers

Genetic Diversity and Variability in two Italian Autochthonous Donkey Genetic Types Assessed by Microsatellite Markers

Assessment of genetic relationship between six populations of Welsh Mountain sheep using microsatellite markers

Genetic diversity of Colombian sheep by microsatellite markers

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