Titre du document / Document title

Centric fusion differences among Oryx dammah, O. gazella, and O. leucoryx (Artiodactyla, Bovidae)

Auteur(s) / Author(s)

KUMAMOTO A. T. ⁽¹⁾ ; CHARTER S. J. ⁽¹⁾ ; KINGSWOOD S. C. ⁽¹⁾ ; RYDER O. A. ⁽¹⁾ ; GALLAGHER D. S. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Center for Reproduction of Endangered Species, Zoological Society of San Diego, San Diego, CA, ETATS-UNIS
⁽²⁾ Department of Animal Science, Texas A&M University, College Station, TX, ETATS-UNIS

Résumé / Abstract

G- and C-banded karyotypes of the genus Oryx were compared using the standard karyotype of Bos taurus. Chromosomal complements were 2n = 56 in O. gazella gazella, 2n = 58 in O. g. beisa and O. g. callotis, 2n = 56-58 in O. dammah, and 2n = 57-58 in O. leucoryx. The number of autosomal arms in all karyotypes was 58. Nearly all variation in diploid number was the result of three independent centric fusions, but one 2n = 57 specimen of O. g. gazella deviated from the normal complement of 2n = 56 due to XXY aneuploidy. A 2;17 centric fusion was fixed in O. g. gazella, whereas O. g. beisa and O. g. callotis lacked this fusion and had indistinguishable karyotypes. Oryx dammah was polymorphic for a 2;15 centric fusion, and O. leucoryx was polymorphic for an 18;19 centric fusion. The five Oryx taxa shared a fixed 1;25 centric fusion; the small acrocentric element involved in the 1;25 fusion was identified by fluorescence in situ hybridization using a cosmid specific to Bos chromosome 25. The X and Y chromosomes were also conserved among the five taxa. Oryx g. gazella differed from the other Oryx species because of the fixed 2;17 centric fusion. This difference reflects an apparently longer period of geographic isolation between O. g. gazella and other populations of Oryx, and it is consistent with the classification of O. gazella and O. beisa as distinct species (see Kingdon, 1997). The lack of monobrachial relationships among the Oryx taxa indicates that sterility barriers between species have not developed. Viability of hybrid offspring constitutes a threat to captive breeding programs designed for endangered species. conservation; in the case of Oryx, the 2;15, 2;17, and 18;19 metacentrics could serve as marker chromosomes for assessing hybridization between certain Oryx taxa.

Revue / Journal Title

Cytogenetics and cell genetics   ISSN 0301-0171   CODEN CGCGBR 

Source / Source

Congrès
EMBO Workshop Molecular Biology of Chromosome 21 & Down Syndrome , ISRAEL (06/06/1999)
1999, vol. 86, n^o 1, pp. 1-20 (42 ref.), pp. 74-80

Langue / Language

Anglais

Editeur / Publisher

Karger, Basel, SUISSE  (1973-2002) (Revue)

Mots-clés anglais / English Keywords

Bovine ; Biological evolution ; Cytogenetics ; Karyotype ; Aneuploidy ; Chromosome ; Melting ; Artiodactyla ; Ungulata ; Mammalia ; Vertebrata ; Chromosomal aberration ;

Mots-clés français / French Keywords

Bovin ; Evolution biologique ; Cytogénétique ; Caryotype ; Aneuploïdie ; Chromosome ; Fusion ; Oryx ; Artiodactyla ; Ungulata ; Mammalia ; Vertebrata ; Aberration chromosomique ;

Mots-clés espagnols / Spanish Keywords

Bovino ; Evolución biológica ; Citogenética ; Cariotipo ; Aneuploidía ; Cromosoma ; Fusión ; Artiodactyla ; Ungulata ; Mammalia ; Vertebrata ; Aberración cromosómica ;

Localisation / Location

INIST-CNRS, Cote INIST : 10561, 35400008961444.0160