Fluorescent in-situ hybridization of cattle and sheep chromosomes with cloned human fragile-X DNA.

Abstract:

:An extensive study on spontaneous and 5-Fluorodeoxyuridine induced fragile sites identified Xq31 in cattle (Bos taurus) and (Xq24, Xq26) in sheep (Ovis aries) in addition to several autosomal fragile sites (under publication). A ZOO-FISH study using three cloned human fragile-X probes with CCG/CGG(n) trinucleotide repeat sequence was carried out to determine homology between human and bovine fragile-X. The hybridisation results showed only a weak signal on a human chromosome that was not an X with all three fragile site probes. No signals were detected in sheep chromosomes. The signal of all three human fragile-X probes on cattle chromosomes was however, medium-prominent sub-centromeric signal on two homologues. BrdU administration in 12 h before harvesting identified these homologues to be chromosome number 5. In addition retrospective slides of cattle and sheep chromosomes used for fragile site studies showed no signals whatsoever. It was therefore concluded that no homology existed between human and bovine fragile-X.

journal_name

Mol Biol Rep

authors

Ali A,Thomsen PD,Babar ME

doi

10.1007/s11033-008-9221-8

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

619-22

issue

3

eissn

0301-4851

issn

1573-4978

journal_volume

36

pub_type

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