Abstract
So far, two thioredoxin proteins, DHD and Trx-2, have been biochemically characterized in Drosophila melanogaster. Here, with the cloning and characterization of TrxT we describe an additional thioredoxin with testis-specific expression. TrxT and dhd are arranged as a gene pair, transcribed in opposite directions and sharing a 471 bp regulatory region. We show that this regulatory region is sufficient for correct expression of the two genes. This gene pair makes a good model for unraveling how closely spaced promoters are differentially regulated by a short common control region. Both TrxT and DHD proteins are localized within the nuclei in testes and ovaries, respectively. Use of a transgenic construct expressing TrxT fused to Enhanced Yellow Fluorescent Protein reveals a clear association of TrxT with the Y chromosome lampbrush loops ks-1 and kl-5 in primary spermatocytes. The association is lost in the absence of the Y chromosome. Our results suggest that nuclear thioredoxins may have regulatory functions in the germline.
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Acknowledgements
We thank K. Kristiansson for excellent technical assistance, H. Salz for providing dhd genomic DNA clones and fly stocks, M. Gatti for Y chromosome translocation stocks and for help in confirming the identity of Y chromosome loops, H. Bauer for Trx-2 antibodies, and A. Miranda-Vizuete and A. Saura for comments on the manuscript. This work was supported by grants from the Swedish Research Council, Nilsson-Ehle, Magnus Bergvall and Philip Sörenssen foundations to J.L., by EMBO Short Term Fellowships to J.L. and by a grant from the Swiss National Science Foundation to V.P.
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Communicated by S. Henikoff
Sequence data from this paper have been deposited with the EMBL/GenBank Data Libraries under Accession number AJ507731
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Svensson, M.J., Chen, J.D., Pirrotta, V. et al. The ThioredoxinT and deadhead gene pair encode testis- and ovary-specific thioredoxins in Drosophila melanogaster . Chromosoma 112, 133–143 (2003). https://doi.org/10.1007/s00412-003-0253-5
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DOI: https://doi.org/10.1007/s00412-003-0253-5