Cytogenetic analysis (GTG, CBG and  NOR bands) of a wild boar population  (Sus scrofa scrofa) with chromosomal  polymorphism in the south-east of Spain

Nombela, JJ Arroyo; Murcia, C.; Abaigar, T.; Vericad, J. R.

doi:10.1051/gse:19900101

Cited by 2 publications

(3 citation statements)

References 16 publications

(23 reference statements)

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“…NORs of chromosome 10 are transcriptionally active in all cells and considered as the main site of rRNA production which was corroborated with the findings of previous studies [ 1 , 9 , 17 , 20 , 22 , 23 ], whereas the NORs of chromosome 8 were not active to a variable degree. Liu et al .…”

Section: Resultssupporting

confidence: 91%

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Nucleolar organizer region banding in crossbred and non-descript pigs of India

Harshini¹,

Devi²,

Kumari³

et al. 2018

Vet World

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Aim:The objective of this experiment was to study the nucleolar organizer region (NOR)-banding pattern in Large White Yorkshire (LWY) crossbred and non-descript pigs and finding differences in the number of NORs between animals and between genetic groups.Materials and Methods:The experiment was carried out on 15 females, and 15 males of LWY crossbred and non-descript pigs to study NOR-banding pattern by employing ammoniacal silver staining technique.Results:A total of 63 and 65 number of good metaphases were prepared in LWY crossbred, and non-descript pigs and a total of 168 and 143 number of NORs were detected on the 8th and 10th chromosomes in both genetic groups, respectively. The mean number of NORs per metaphase was 2.67 and 2.20 in LWY crossbred and non-descript pigs, respectively. LWY crossbred pig had high mean number of silver-stained NORs (Ag-NORs) per metaphase compared to non-descript pig. In general, it was observed that the highest frequency of metaphases (%) examined had two number of NORs, while the lowest frequency (%) had four number of NORs. The number of NORs observed per metaphase on secondary constrictions of the 8th and 10th chromosome pair in both genetic groups ranged from 2 to 4. The Chi-square test of significance revealed that the observed frequencies do not differ significantly from the expected frequencies.Conclusion:The results confirmed differences across breeds in occurrence and number of NORs on chromosomes in pigs. The mean numbers of NORs present per metaphase vary between the animals indicating the existence of polymorphism for the number of NORs. A higher number of Ag-NORs were observed on chromosome pair 10 in both the genetic groups. It was concluded that NORs were more morphologically distinct and greater on chromosome pair 10 than on pair 8, which suggests a dominant role of chromosome 10 in the global production of ribosomal RNA.

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Section: Resultssupporting

confidence: 91%

“…Of total 63 metaphases, 20 number of metaphases had no Ag-NORs on chromosome number 8. On chromosome pair 10, it was observed that two silver deposits were most frequent [ 22 ] and 10 metaphases were found with single silver deposits ( Table-3 ).…”

Section: Resultsmentioning

confidence: 99%

Nucleolar organizer region banding in crossbred and non-descript pigs of India

Harshini¹,

Devi²,

Kumari³

et al. 2018

Vet World

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“…The normal diploid number of chromosomes in the karyotype of DP is 2 n = 38 (Gustavsson, 1988 ). In European WB populations, individuals with 2 n = 36, 37 or 38 chromosomes have been described in France (Darre et al, 1992 ) and in the Iberian Peninsula (Nombela et al, 1990 ), as well as in some Northern and Eastern European countries (Aravena & Skewes, 2007 ). The only difference between the three karyotypes is the existence of a Robertsonian translocation between chromosomes 15 and 17: rob(15;17).…”

Section: Introductionmentioning

confidence: 99%

Genome‐wide analysis of hybridization in wild boar populations reveals adaptive introgression from domestic pig

Mary

Iannuccelli

Petit

et al. 2022

Evolutionary Applications

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The admixture of domestic pig into French wild boar populations has been monitored since the 1980s thanks to the existence of a cytogenetic difference between the two sub-species. The number of chromosomes is 2n = 36 in wild boar and 2n = 38 in pig, respectively. This difference makes it possible to assign the "hybrid" status to wild boar individuals controlled with 37 or 38 chromosomes. However, it does not make it possible to determine the timing of the hybridization(s), nor to guarantee the absence of domestic admixture in an animal with 2n = 36 chromosomes. In order to analyze hybridization in greater detail and to avoid the inherent limitations of the cytogenetic approach, 362 wild boars (WB) recently collected in different French geographical areas and in different environments (farms, free ranging in protected or unprotected areas, animals with 2n = 36, 37 or 38 chromosomes) were genotyped on a 70K SNP chip. Principal component analyses allowed the identification of 13 "outliers" (3.6%), for which the proportion of the genome of "domestic" origin was greater than 40% (Admixture analyses). These animals were probably recent hybrids, having Asian domestic pig ancestry for most of them. For the remaining 349 animals studied, the proportion of the genome of "wild" origin varied between 83% and 100% (median: 94%).This proportion varied significantly depending on how the wild boar populations were managed. Local ancestry analyses revealed adaptive introgression from domestic pig, suggesting a critical role of genetic admixture in improving the fitness and population growth of WB. Overall, our results show that the methods used to monitor the domestic genetic contributions to wild boar populations should evolve in order to limit the level of admixture between the two gene pools.

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Cytogenetic analysis (GTG, CBG and NOR bands) of a wild boar population (Sus scrofa scrofa) with chromosomal polymorphism in the south-east of Spain

Cited by 2 publications

References 16 publications

Nucleolar organizer region banding in crossbred and non-descript pigs of India

Nucleolar organizer region banding in crossbred and non-descript pigs of India

Genome‐wide analysis of hybridization in wild boar populations reveals adaptive introgression from domestic pig

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