Lampbrush loop-specific protein of Drosophila hydei.

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Abstract
By immunofluorescence techniques and protein blotting experiments it was shown that an antiserum specifically reacts with a MW 80,000 protein (the Ps protein) in the lampbrush loop pseudonucleolus in spermatocyte nuclei of D. hydei. Comparative studies of X/Y and X/0 testes indicate that the gene encoding the Ps protein is not located on the Y chromosome but on an autosome or the X chromosome. The Ps protein is tissue specific. It is likely to be a rather conserved protein since the antigenic determinant recognized by the antiserum could be detected in the spermatocyte nuclei of a number of other Drosophila spp. For those species with prominent Y chromosomal lampbrush loops, it could be shown that the cross-reaction is, as in D. hydei, associated with a specific Y chromosomal loop.