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. 1988;96(2):159-70.
doi: 10.1007/BF00331048.

Structure and Function of Y Chromosomal DNA. II. Analysis of Lampbrush Loop Associated Transcripts in Nuclei of Primary Spermatocytes of Drosophila Hydei by in Situ Hybridization Using Asymmetric RNA Probes of Four Different Families of Repetitive DNA

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Structure and Function of Y Chromosomal DNA. II. Analysis of Lampbrush Loop Associated Transcripts in Nuclei of Primary Spermatocytes of Drosophila Hydei by in Situ Hybridization Using Asymmetric RNA Probes of Four Different Families of Repetitive DNA

P Trapitz et al. Chromosoma. .

Abstract

pSP64/65 subclones of four different families of repetitive sequences on the Y chromosome of Drosophila hydei were used for in vitro synthesis of labelled RNA. Pairs of RNA probes of opposite strand polarity were employed to analyse RNAs transcribed on, or associated with, various Y chromosomal lampbrush loops in nuclei of primary spermatocytes of D. hydei. The results of RNA filter analysis and in situ hybridization experiments can be generalized as follows: (1) Y-specific transcripts are heterogeneous in length and are synthesized on lampbrush loops. (2) Transcription of tandemly repeated sequences is usually strand specific. (3) Members of the same sequence family can be found in transcripts from different lampbrush loops. (4) Transcripts not coded by the Y chromosome are accumulated on different subregions of Y chromosomal lampbrush loops.

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