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Titolo:
Chromosome evolution in the Salmonidae (Pisces): an update
Autore:
Phillips, R; Rab, P;
Indirizzi:
Univ Wisconsin, Dept Biol Sci, Milwaukee, WI 53201 USA Univ Wisconsin Milwaukee WI USA 53201 t Biol Sci, Milwaukee, WI 53201 USA Inst Anim Physiol & Genet, Lab Fish Genet, Libechov 27721, Czech Republic Inst Anim Physiol & Genet Libechov Czech Republic 27721 , Czech Republic
Titolo Testata:
BIOLOGICAL REVIEWS
fascicolo: 1, volume: 76, anno: 2001,
pagine: 1 - 25
SICI:
1464-7931(200102)76:1<1:CEITS(>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEOLAR ORGANIZER REGIONS; CONSTITUTIVE HETEROCHROMATIN DISTRIBUTION; BIOCHEMICAL GENETIC-VARIATION; VENDACE COREGONUS-ALBULA; CHAR SALVELINUS-ALPINUS; C-BANDING PATTERNS; SEX-CHROMOSOMES; RAINBOW-TROUT; ATLANTIC SALMON; LAKE TROUT;
Keywords:
cytogenetics; chromosomes; fish; salmonid; Salmonidae; Pisces; trout; salmon; char; whitefish; grayling;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
211
Recensione:
Indirizzi per estratti:
Indirizzo: Phillips, R Univ Wisconsin, Dept Biol Sci, Milwaukee, WI 53201 USA Univ Wisconsin Milwaukee WI USA 53201 Milwaukee, WI 53201 USA
Citazione:
R. Phillips e P. Rab, "Chromosome evolution in the Salmonidae (Pisces): an update", BIOL REV, 76(1), 2001, pp. 1-25

Abstract

The karyotypes of salmonid fishes including taxa in the three subfamilies Coregoninae, Thymallinae and Salmoninae are described. This review is an update of the (Hartley, 1987) review of the chromosomes of salmonid fishes. As described in the previous review, the karyotypes of salmonid fishes fall into two main categories based on chromosome numbers: the type A karyotypeshave diploid numbers close to 80 with approximately 100 chromosome arms (2n = 80, NF = 100), and the type B karyotypes have diploid numbers close to 60 with approximately 100 chromosome arms (2n = 60, NF = 100). In this paper we have proposed additional sub categories based on variation in the number of chromosome arms: the A' type with NF = 110-120, the A" type with NF greater than 140, and the B' type with NF less than 80. Two modes of chromosome evolution are found in the salmonids:in the Coregoninae and the Salmoninae the chromosomes have evolved by centric fusions of the Robertsonian type decreasing chromosome numbers (2n) while retaining chromosome arm numbers(NF) close to that found in the hypothetical tetraploid ancestor so that most extant taxa have either type A or type B karyotypes. In the Thymallinae, the chromosomes have evolved by inversions so that chromosome arm numbers(NF) have increased but chromosome numbers (2n) close to the karyotype of the hypothetical tetraploid ancestor have been retained and all taxa have type A" karyotypes. Most of the taxa with type B karyotypes in the Coregoninae and Salmoninae are members of the genus Oncorhynchus, although at least one example of type B karyotypes is found in all of the other genera. Thesetaxa either have an anadromous life history or are found in specialized lacustrine environments. Selection for increases or decreases in genetic recombination as proposed by Qumsiyeh, 1994 could have been involved in the evolution of chromosome number in salmonid fishes.

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Documento generato il 02/04/20 alle ore 06:31:05