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Comparative Study
. 1993 May;1(1):69-75.
doi: 10.1007/BF00710609.

Inverted and satellited Y chromosome in the orangutan (Pongo pygmaeus)

W Schempp  1 , R Toder, W Rietschel, F Grützner, A Mayerová, A Gauckler
Affiliations
Comparative Study

Inverted and satellited Y chromosome in the orangutan (Pongo pygmaeus)

W Schempp et al. Chromosome Res. 1993 May.

Abstract

An inverted and satellited Y chromosome of almost acrocentric appearance was detected in seven of 14 male orangutans. In the remaining seven animals a submetacentric Y chromosome without NORs occurred. The high frequency with which the satellited Y chromosomes were associated with acrocentric autosomes and the positive AgNO3-staining of their satellite stalks clearly indicate the active state of the NOR on the Y chromosomes. DNA fingerprinting in two orangutan families showed that the inverted and satellited Y chromosomes in carrier orangutan males do not interfere with normal fertility. Within our sample of male orangutans studied, the inverted and satellited Y chromosome is restricted to Sumatran animals; all Bornean specimens possessed the submetacentric Y chromosome. The question arises whether these two kinds of Y chromosome differ constitutively between the Pongo pygmaeus subpopulations.

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