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. 1999;7(8):635-40.
doi: 10.1023/a:1009236103013.

Differentiation of Z and W Chromosomes Revealed by Replication Banding and FISH Mapping of Sex-Chromosome-Linked DNA Markers in the Cassowary (Aves, Ratitae)

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Differentiation of Z and W Chromosomes Revealed by Replication Banding and FISH Mapping of Sex-Chromosome-Linked DNA Markers in the Cassowary (Aves, Ratitae)

C Nishida-Umehara et al. Chromosome Res. .

Abstract

We identified sex chromosomes of the double-wattled cassowary (Casuarius casuarius) by a replication banding method. The acrocentric Z chromosome, the fifth largest pair in males and slightly smaller W chromosome show no sign of heterochromatinization and share a nearly identical banding pattern in the distal half of the long arm. These chromosomes were further characterized by FISH with three probes linked either to Z or W chromosome in most avian species examined thus far. Contrary to the situation in the chicken, we obtained positive signals with Z-specific ZOV3 and W-specific EEO.6 in the distal region of both Z and W chromosomes. However, IREBP signals localized to the proximal half of the Z chromosome were not detected on the W chromosome. Thus, structural rearrangements such as deletions and inversions might have been the initial step of W chromosome differentiation from an ancestral homomorphic pair in this species.

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