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. 1987 May;84(9):2843–2847. doi: 10.1073/pnas.84.9.2843

Cloning and characterization of a dispersed, multicopy, X chromosome sequence in Drosophila melanogaster.

G L Waring, J C Pollack
PMCID: PMC304756  PMID: 3106978

Abstract

We have isolated and characterized a dispersed middle repetitive DNA sequence from Drosophila melanogaster that is concentrated on the euchromatic portion of the X chromosome. In situ hybridization of the repeat unit to salivary gland chromosomes shows the sequence is distributed among approximately 10 major and 20 minor X chromosomal sites. Based on DNA sequence analysis of homologous sequences from three different cytogenetic regions, the 372-base-pair repeat unit appears to be (A + T)-rich and noncoding and shows strong sequence conservation among units from different chromosomal regions. The nature and distribution of this sequence are suggestive of the hypothetical X chromosome DNA sequences thought to be involved in the primary establishment of sex determination and dosage compensation in Drosophila.

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