Genetic diversity, structure, and breed relationships in Tunisian sheep

Sassi-Zaidy, Yousra Ben; Maretto, Fabio; Charfi-Cheikrouha, F.; Cassandro, Martino

doi:10.1016/j.smallrumres.2014.02.005

Cited by 25 publications

(33 citation statements)

References 11 publications

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“…Mean number of alleles, observed (Ho) and expected (He) heterozygosity values obtained in the present study were higher than those of earlier studies (Ben Sassi-Zaidy et al 2014;Gaouar et al 2014Gaouar et al , 2015bGaouar et al , 2016aGaouar et al , 2016bKdidi et al 2015;Guang-Xin et al 2016;Loukovitis et al 2016;Othman et al 2016). On the other hand, Algerian sheep breeds generally showed a high genetic diversity in comparison with the results obtained by Gaouar et al (2014Gaouar et al ( , 2015b on the same breeds.…”

Section: Discussioncontrasting

confidence: 79%

“…It can be said that there is loss of heterozygosity in four microsatellite loci studied considering F IS value is also known as the inbreeding coefficient. It is noteworthy that obtained general mean of F ST value is higher than earlier studies (Cemal et al 2013;Ben Sassi-Zaidy et al 2014;Ocampo et al 2016) and lower than others (Sodhi et al 2006;Yilmaz et al 2014). The differences between the previous literature and the present study were mainly due to non-comparative aspects such as studied microsatellite and breed differences.…”

Section: Discussioncontrasting

confidence: 61%

“…It was an important parameter in the study that the F IS and F IT values were considerably lower than the numerous sheep breeds such as Colombian sheep breeds (Ocampo et al 2016), Tunisian native sheep breeds (Ben Sassi-Zaidy et al 2014) and Turkish native sheep breeds (Yilmaz et al 2014), and higher than the values reported by Cemal et al (2013). It can be said that there is loss of heterozygosity in four microsatellite loci studied considering F IS value is also known as the inbreeding coefficient.…”

Section: Discussionmentioning

confidence: 54%

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New genetic identification and characterisation of 12 Algerian sheep breeds by microsatellite markers

Ameur

Ata

Benyoucef

et al. 2017

Italian Journal of Animal Science

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Exposition of variations between breeds is very important for genetic diversity. Determination of this variation is needed to reveal population structure and relationship between populations and planning national breeding and conservation programmes. This study was carried out in 296 animals from 12 different local sheep breeds (Barbarine, Ouled Djellal, Ifilene, Srandi, Darâa, Rembi, Berbere, Taâdmit, Hamra, Sidaou, Tazegzawt and D'men) reared in different regions of Algeria. Fifteen microsatellite markers were used to determine between breed genetic diversity. The population of 12 sheep breeds studied from Algeria exhibited a high number of alleles (24.67) and polymorphic information content (0.90). Observed heterozygosity values were lower than expected for all molecular markers except INRA0123 locus. Obtained G ST value from the present study indicated that 1.9% of total genetic variation resulted from the differences between the breeds. The present study supplied important information to understand between breed genetic differences. Moreover, it has provided the opportunity to discuss with previously reported results. In light of these findings, it can be said that studied microsatellite markers can be successfully used to determine genetic diversity and population structure in Algerian sheep breeds. ARTICLE HISTORY

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Section: Discussioncontrasting

confidence: 79%

Section: Discussioncontrasting

confidence: 61%

Section: Discussionmentioning

confidence: 54%

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New genetic identification and characterisation of 12 Algerian sheep breeds by microsatellite markers

Ameur

Ata

Benyoucef

et al. 2017

Italian Journal of Animal Science

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“…Ferrando et al (2014) also found close F ST value in six breeds located in the eastern Pyrenees ranging from 0.011 to 0.053. When Saudi sheep populations were compared with other populations from different countries, the F ST values were lower than those found in this study (Sassi-Zaidy et al, 2014;Álvarez et al, 2012).…”

Section: Discussioncontrasting

confidence: 91%

Genetic diversity among Sawakni, Berberi and Najdi sheep breeds in Saudi Arabia using microsatellites markers

Mahmoud¹,

Swelum²,

Farah³

et al. 2017

Afr. J. Biotechnol.

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The present study was conducted to assess the genetic diversity and population genetic structure of three sheep populations namely; Sawakni (SW), Berberi (BR) and Najdi (NJ), in Saudi Arabia, utilizing 45, 18 and 31 individual blood DNA extractions, respectively. Seventeen microsatellite markers were used to genotype these 94 sheep individuals. There were 195 alleles generated employing the 17 microsatellites loci with a mean of 11.47 alleles per locus, with a range of observed and expected heterozygosity from 0.651 to 0.989 and 0.590 to 0.816, respectively. The total number of alleles of 169, 127 and 111, and their means of effective number of alleles of 4.983, 4.192 and 3.781 were observed in SW, BR and NJ populations, respectively. Thirteen of the microsatellites loci studied in SW, seven loci in BR and five loci in NJ were found to be deviated from Hardy-Weinberg Equilibrium. The fixation genetic indices (F ST ) among the three populations were very low, ranging from 0.029 (between SW and BR) to 0.038 (between NJ and BR), indicating low population differentiation among the three sheep populations. The present study showed that the microsatellite markers are powerful tools in breeding programs, however more microsatellites may be needed for a broad judgment on the genetic status of the sheep populations in Saudi Arabia.

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“…A panel of 17 microsatellite markers (Table 1) was established, including some markers from the ISAG/FAO recommended microsatellite markers (FAO, 2011) and others from previous studies (Baumung et al, 2006;Dalvit et al, 2009;Ben Sassi-Zaidy et al, 2014a). Genotypes for all 17 microsatellite markers were identified as described in Ben Sassi-Zaidy et al (2014b).…”

Section: Animal Sampling and Microsatellite Analysismentioning

confidence: 99%

Contribution of microsatellites markers in the clarification of the origin, genetic risk factors, and implications for conservation of Tunisian native sheep breeds

et al. 2016

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ABSTRACT. The genetic diversity and genetic relationship of the two main groups of African sheep, thin-tailed and fat-tailed sheep, represented by the indigenous Tunisian sheep breeds "Barbarine" (BAR, fat-tailed) and "Queue Fine de l'Ouest" (QFO, thin-tailed) were investigated. The genotypes of 110 animals belonging to these two breeds and their crossbreed (CRO) were assessed using 17 microsatellite markers. The results showed high levels of genetic diversity and a total of 256 alleles were identified in the whole population. The mean values of observed and expected heterozygosity were 0.719 and 0.789, respectively, and the mean allelic richness estimate was 10.89. values over all loci indicated a notable level of inbreeding within the whole population. However, the F ST value (0.007) showed a low level of genetic differentiation between these two native breeds. The high level of both gene flow and molecular coancestry coefficient detected between the two breeds and their CRO revealed an old miscegenation between the BAR and QFO breeds. The clustering analysis performed with the STRUCTURE software confirmed gene flow between these two breeds. Results arising from this study provide evidence regarding the genetic structure and variability of the two main local sheep breeds, and the implications of their actual management, which indicates the need for an urgent conservation strategy in order to prevent significant gene flow and preserve the remaining breed specificity for future generations.

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Genetic diversity, structure, and breed relationships in Tunisian sheep

Cited by 25 publications

References 11 publications

New genetic identification and characterisation of 12 Algerian sheep breeds by microsatellite markers

New genetic identification and characterisation of 12 Algerian sheep breeds by microsatellite markers

Genetic diversity among Sawakni, Berberi and Najdi sheep breeds in Saudi Arabia using microsatellites markers

Contribution of microsatellites markers in the clarification of the origin, genetic risk factors, and implications for conservation of Tunisian native sheep breeds

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