Evolution of Bird Sex Chromosomes Narrated by Repetitive Sequences: Unusual W Chromosome Enlargement in Gallinula melanops (Aves: Gruiformes: Rallidae)

被引：21

作者：

Gunski, Ricardo J. ^{[1
]}

Kretschmer, Rafael ^{[2
]}

de Souza, Marcelo Santos ^{[1
]}

Furo, Ivanete de Oliveira ^{[3
]}

Barcellos, Suziane A. ^{[1
]}

Costa, Alice L. ^{[4
]}

Cioffi, Marcelo B. ^{[5
]}

de Oliveira, Edivaldo H. C. ^{[6
,7
]}

Garnero, Analia del Valle ^{[1
]}

机构：

[1] Univ Fed Pampa, PPGCB, Programa Posgrad Ciencias Biol, Sao Gabriel, Brazil

[2] Univ Fed Rio Grande do Sul, PPGBM, Porto Alegre, RS, Brazil

[3] Univ Fed Para, PPGBM, Belem, Para, Brazil

[4] Univ Fed Pampa, Grad Ciencias Biol, Sao Gabriel, Brazil

[5] Univ Fed Sao Carlos, Dept Genet & Evolucao, Sao Carlos, SP, Brazil

[6] Univ Fed Para, Inst Ciencias Exatas & Nat, Belem, Para, Brazil

[7] Inst Evandro Chagas, SAMAM, Lab Cultura Tecidos & Citogenet, Ananindeua, Brazil

来源：

CYTOGENETIC AND GENOME RESEARCH | 2019年 / 158卷 / 03期

关键词：

Bird cytogenetics; Microsatellite sequences; Ribosomal DNA; Sex chromosome evolution; HOPLIAS-MALABARICUS CHARACIFORMES; ORGANIZER REGIONS; DNA-SEQUENCE; SYSTEM; GENOME; FISH; ERYTHRINIDAE; KARYOTYPES; DIFFERENTIATION; REARRANGEMENTS;

D O I：

10.1159/000501381

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

Among birds, species with the ZZ/ZW sex determination system generally show significant differences in morphology and size between the Z and W chromosomes (with the W usually being smaller than the Z). In the present study, we report for the first time the karyotype of the spot-flanked gallinule (Gallinula melanops) by means of classical and molecular cytogenetics. The spot-flanked gallinule has 2n = 80 (11 pairs of macrochromosomes and 29 pairs of microchromosomes) with an unusual W chromosome that is larger than the Z. Besides being totally heterochromatic, it has a secondary constriction in its long arm corresponding to the nucleolar organizer region, as confirmed by both silver staining and mapping of 18S rDNA probes. This is an unprecedented fact among birds. Additionally, 18S rDNA sites were also observed in 6 microchromosomes, while 5S rDNA was found in just 1 microchromosomal pair. Seven out of the 11 used microsatellite sequences were found to be accumulated in microchromosomes, and 6 microsatellite sequences were found in the W chromosome. In addition to the involvement of heterochromatin and repetitive DNAs in the differentiation of the large W chromosome, the results also show an alternative scenario that highlights the plasticity that shapes the evolutionary history of bird sex chromosomes. (c) 2019 S. Karger AG, Basel

引用

页码：152 / 159

页数：8

共 1 条

[1] Differentiation of the XY Sex Chromosomes in the Fish Hoplias malabaricus (Characiformes, Erythrinidae): Unusual Accumulation of Repetitive Sequences on the X Chromosome
Cioffi, M. B.
Martins, C.
Vicari, M. R.
Rebordinos, L.
Bertollo, L. A. C.
SEXUAL DEVELOPMENT, 2010, 4 (03) : 176 - 185

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