The organization of the evolutionarily conserved GATA/GACA repeats in the mouse genome.

Abstract:

:Simple repeated GATA and GACA sequences which were originally isolated from sex-specific snake satellite DNA have been found subsequently in all eukaryotes studied. The organization of these sequences within the mouse genome was investigated here by using synthetic oligonucleotide probes as a novel tool in comparison with conventional hybridization probes. Southern blot hybridization showed sex-specific patterns with both the (GATA)4 and (GACA)4 oligonucleotide probes, as previously described with conventional probes. The quantitative analysis of two mouse DNA phage libraries and of 25 isolated GATA-positive phage clones revealed intensive interspersion of GATA sequences with GACA, and with other repetitive and single-copy sequences. Ubiquitous interspersion and homogeneous genomic distribution of GATA and GACA sequences were confirmed by hybridization in situ of the oligonucleotide probes to metaphase chromosomes. The lengths of the GATA and GACA stretches were found to vary considerably in the individual phage clones. DNA inserts from 20 phages were assigned to autosomes and sex chromosomes and three genomic fragments were found to be confined to the Y chromosome. The organization of GATA and GACA sequences is discussed in the context of their evolutionary potential and possible conservation mechanisms.

journal_name

Chromosoma

journal_title

Chromosoma

authors

Schäfer R,Ali S,Epplen JT

doi

10.1007/BF00386791

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

502-10

issue

6

eissn

0009-5915

issn

1432-0886

journal_volume

93

pub_type

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