Detection of pericentric inversion of X chromosome in a male fetus

The karyotypes of Phyllostomus discolor and P. hastatus from Eastern Amazonia were studied by G-, C-, G/C sequential and Ag-NOR techniques. Both species presented 2n = 32, with the autosome complement composed of 30 bi-armed in P. discolor and 28 bi-armed plus 1 acrocentric in P. hastatus. In both species, the X chromosome is medium submetacentric while the Y is minute acrocentric. The present study found only one difference between the karyotypes of P. discolor and P. hastatus: the smallest autosome (pair 15) is bi-armed in discolor and acrocentric in hastatus, a result best explained by pericentric inversion. The C-banding revealed constitutive heterochromatin only at the centromeric regions of all chromosomes, with the NOR site located at the distal region of short arm of pair 15, in both species. The taxon P. discolor is considered primitive for genus Phyllostomus and the bi-armed form of pair 15 is the assumed primitive condition which, rearranged by a pericentric inversion originated the acrocentric from found in P. hastatus.

Download Full-text

Turnerʼs Syndrome with a Duplication-Deficiency X Chromosome Derived from a Maternal Pericentric Inversion X Chromosome

Obstetrical & Gynecological Survey ◽

10.1097/00006254-197909000-00017 ◽

1979 ◽

Vol 34 (9) ◽

pp. 681-683

Author(s):

TOHRU MAEDA ◽

MICHIKO OHNO ◽

MASUMI TAKADA ◽

MASATO NISHIDA ◽

KAZUKO TSUKIOKA ◽

...

Keyword(s):

X Chromosome ◽

Pericentric Inversion

Download Full-text

An Electroporetic and Chromosomal Study of the Dasyurid Marsupial Genus Ningaui Archer

Australian Journal of Zoology ◽

10.1071/zo9830381 ◽

1983 ◽

Vol 31 (3) ◽

pp. 381 ◽

Cited By ~ 12

Author(s):

PR Baverstock ◽

M Adams ◽

M Archer ◽

NL Mckenzie ◽

RA How

Keyword(s):

X Chromosome ◽

Western Australia ◽

Reciprocal Translocation ◽

Pericentric Inversion ◽

Constitutive Heterochromatin ◽

South Australia ◽

Isozyme Electrophoresis ◽

The Third ◽

Genetic Groups ◽

Karyotypic Diversity

Isozyme electrophoresis of 28 loci was used to characterize 30 specimens of Ningaui from four States of Australia. The specimens fall into three genetic groups, with large differences between groups (21-32% fixed differences) and genetic homogeneity within groups. One group, from the Pilbara of Western Australia, is referable to N. timealeyi; a second group, extending from the Kalgoorlie area of Western Australia to the far west of South Australia and north to the Tanami Desert of the Northern Temtory, is referable to N. ridei; and a third group extends from the Kalgoorlie area of Western Australia (where it is sympatric with N. ridei) across southern South Australia and into north-westem Victoria. Because the third group maintains its genetic uniqueness despite being sympatric with N. ridei, it clearly represents a different species, N. yvonnae Kitchener, Stoddart & Henry. This species is distinguishable from N. ridei on skull characters, but indistinguishable on external characters. In contrast to most dasyurids, ningauis display considerable karyotypic diversity involving a pericentric inversion, a reciprocal translocation and addition of constitutive heterochromatin to the X-chromosome.

Download Full-text