Variation in the mitochondrial control region sequence between the two maternal lines of the Sorraia horse breed

Luı́s, Cristina; Bastos-Silveira, Cristiane; Cothran, E. Gus; Oom, María do Mar

doi:10.1590/s1415-47572002000300010

Cited by 25 publications

(29 citation statements)

References 8 publications

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“…One deletion, also reported in three sequences (AF481311, AF481320, AF481322) by Hill et al [4], was identified in Thoroughbred samples. Two substitutions (positions 15945 and 15720), already mentioned in other breeds [2,8,12], were identified (Tab. II).…”

Section: Resultsmentioning

confidence: 67%

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Mitochondrial D-loop sequence variation among Italian horse breeds

et al. 2004

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-The genetic variability of the mitochondrial D-loop DNA sequence in seven horse breeds bred in Italy (Giara, Haflinger, Italian trotter, Lipizzan, Maremmano, Thoroughbred and Sarcidano) was analysed. Five unrelated horses were chosen in each breed and twenty-two haplotypes were identified. The sequences obtained were aligned and compared with a reference sequence and with 27 mtDNA D-loop sequences selected in the GenBank database, representing Spanish, Portuguese, North African, wild horses and an Equus asinus sequence as the outgroup. Kimura two-parameter distances were calculated and a cluster analysis using the Neighbourjoining method was performed to obtain phylogenetic trees among breeds bred in Italy and among Italian and foreign breeds. The cluster analysis indicates that all the breeds but Giara are divided in the two trees, and no clear relationships were revealed between Italian populations and the other breeds. These results could be interpreted as showing the mixed origin of breeds bred in Italy and probably indicate the presence of many ancient maternal lineages with high diversity in mtDNA sequences.mitochondrial DNA / D-loop / biodiversity / phylogeny / Italian horse

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Section: Resultsmentioning

confidence: 67%

“…The mitochondrial DNA D-loop region is very polymorphic as reported by many authors (2,4,5,6,7,8,9,10,12,13,22,24). Twenty-two haplotypes were identified in our samples.…”

Section: Discussionmentioning

confidence: 76%

Mitochondrial D-loop sequence variation among Italian horse breeds

et al. 2004

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“…The upstream part (HVR1) of the control region is usually more variable (and thus more informative) than the downstream part (HVR2); many analyses are therefore based just on the sequences of the HVR1 fragment. e.g., seven distinct haplotypes were detected by sequence analysis of 20 Exmoor ponies while the variation in the Sorraia breed (a primitive Iberian equine type, recovered from 12 founders in 1937) is limited to two distinct haplotypes (Luís et al, 2002(Luís et al, , 2006a.…”

Section: Mtdna Haplotypes Of Extant Domestic Horsesmentioning

confidence: 99%

Domestication of the horse: Genetic relationships between domestic and wild horses

Kavar

Dovč

2008

Livestock Science

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“…Finally, the dendrogram illustrates a clear divergence concerning the Sorraia horse breed. This evidence can be explained not only by founder effect (the breed has been established from only 12 founders; Luís et al, 2002a), but also by a very small effective size that, together with the effects of genetic drift, had inevitable repercussions on the breed's much reduced variability.…”

Section: Genetic Differentiation and Population Relationshipsmentioning

confidence: 99%

Genetic Structure of an Endangered Portuguese Semiferal Pony Breed, the Garrano

et al. 2005

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The present study intends to survey the genetic variability of an endangered semiferal Portuguese native pony breed, the Garrano. Thirteen microsatellite markers were examined in 277 animals born in 1998, belonging to eight subpopulations corresponding to eight northern Portuguese geographic regions. Mean heterozygosity (H(o)) in the Garrano breed was 0.732, ranging from 0.531 to 0.857 across subpopulations. Allelic frequencies and diversity differed significantly between regions, suggesting the existence of genetic differentiation within the breed confirmed by the population differentiation estimator F(ST). Allele sharing genetic distance (Dps) was used to determine the relationship between the analyzed subpopulations, some of which are diverging significantly from the others. Relationships among six Iberian horse breeds (including the Garrano) were assessed through the restricted maximum likelihood method, which clusters the Garrano with another Celtic pony, the Spanish Asturcon, traditionally bred in geographical continuity with the Garrano. Results reveal a statistically significant deficit of heterozygotes within the Garrano breed (F(IT) = 0.031, p < 0.05). Regular monitoring should therefore be implemented so that the effect of genetic drift within subpopulations, enhanced by inbreeding, may be successfully minimized.

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Variation in the mitochondrial control region sequence between the two maternal lines of the Sorraia horse breed

Cited by 25 publications

References 8 publications

Mitochondrial D-loop sequence variation among Italian horse breeds

Mitochondrial D-loop sequence variation among Italian horse breeds

Domestication of the horse: Genetic relationships between domestic and wild horses

Genetic Structure of an Endangered Portuguese Semiferal Pony Breed, the Garrano

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