Insulator Protein CP190 Regulates Expression оf Spermatocyte Differentiation Genes in Drosophila melanogaster Male Germline

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Abstract

CP190 protein is one of the key components of Drosophila insulator complexes, and its study is important for understanding the mechanisms of gene regulation during cell differentiation. However, Cp190 mutants die before reaching adulthood, which significantly complicates the study of its functions in imago. To overcome this problem and to investigate the regulatory effects of CP190 in adult tissues development, we have designed a conditional rescue system for Cp190 mutants. Using Cre/loxP-mediated recombination, the rescue construct containing Cp190 coding sequence is effectively eliminated specifically in spermatocyte, allowing us to study the effect of the mutation in male germ cells. Using high-throughput transcriptome analysis we determined the function of CP190 on gene expression in germline cells. Cp190 mutation was found to have opposite effects on tissue-specific genes, which expression is repressed by CP190, and housekeeping genes, that require CP190 for activation. Mutation of Cp190 also promoted expression of a set of spermatocyte differentiation genes that are regulated by tMAC transcriptional complex. Our results indicate that the main function of CP190 in the process of spermatogenesis is the coordination of interactions between differentiation genes and their specific transcriptional activators.

About the authors

S. E. Romanov

Institute of Molecular and Cellular Biology, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Email: laktionov@mcb.nsc.ru
Russia, 630090, Novosibirsk; Russia, 630090, Novosibirsk

V. V. Shloma

Institute of Molecular and Cellular Biology, Siberian Branch, Russian Academy of Sciences

Email: laktionov@mcb.nsc.ru
Russia, 630090, Novosibirsk

D. E. Koryakov

Institute of Molecular and Cellular Biology, Siberian Branch, Russian Academy of Sciences

Email: laktionov@mcb.nsc.ru
Russia, 630090, Novosibirsk

S. N. Belyakin

Institute of Molecular and Cellular Biology, Siberian Branch, Russian Academy of Sciences

Email: laktionov@mcb.nsc.ru
Russia, 630090, Novosibirsk

P. P. Lakitionov

Institute of Molecular and Cellular Biology, Siberian Branch, Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: laktionov@mcb.nsc.ru
Russia, 630090, Novosibirsk; Russia, 630090, Novosibirsk

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Copyright (c) 2023 С.Е. Романов, В.В. Шлома, Д.Е. Коряков, С.Н. Белякин, П.П. Лактионов

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