Identification of cloned Y chromosomal DNA sequences from a lampbrush loop of Drosophila hydei.

Abstract
By recombinant DNA techniques, a Y chromosomal sequence of D. hydei was isolated. This DNA sequence of 8.93-kilobase length is a member of a family of repetitive sequences located in the short arm of the Y chromosome. Tissue-specific transcripts complementary to the cloned sequence were found in testes RNA. Such transcripts are present in the lampbrush loop pair nooses in primary spermatocyte nuclei, a loop pair that is associated with the only fertility gene in the short arm of the Y chromosome.