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Rungger-Brändle, E. et al.

Localization of RNA polymerase B and histones in the nucleus of primary spermatocytes of Drosophila hydei, studied by immunofluorescence microscopy.

By means of indirect immunofluorescence microscopy, we have studied the distribution of RNA polymerase B, of the nucleosomal histones H2b, H3, and H4 and of histone H1, in nuclei of primary spermatocytes of Drosophila hydei. RNA polymerase B and histones, including H1, are found to be present on the loop structures of the Y chromosome. The nucleolus stains only for the histones, but not for RNA polymerase B. Various mutants deficient for some of the loops or altering their morphology, were used to identify the individual chromosomal segments. In growing spermatocytes of the genetic constitution X/0, autosomes and the chromosome X react strongly with antibodies against RNA polymerase B, but not with antibodies against histones. The results suggest that the autosomes, the chromosome X and the Y chromosomal loop structures, with the exception of the nucleolus, are transcribed mostly by RNA polymerase B.[1]

References

Localization of RNA polymerase B and histones in the nucleus of primary spermatocytes of Drosophila hydei, studied by immunofluorescence microscopy. Rungger-Brändle, E., Jamrich, M., Bautz, E.K. Chromosoma (1981) [Pubmed]

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