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SetDB1 and Su(var)3-9 are essential for late stages of larval development of Drosophila melanogaster

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Abstract

Methylation of H3K9 histone residue is a marker of gene silencing in eukaryotes. Three enzymes responsible for adding this modification — G9a, SetDB1/Egg, and Su(var)3-9 — are known in Drosophila. To understand how simultaneous mutations of SetDB1 and Su(var)3-9 may affect the fly development, appropriate combinations were obtained. Double mutants egg; Su(var)3-9 displayed pronounced embryonic lethality, slower larval growth and died before or during metamorphosis. Analysis of transcription in larval salivary glands and wing imaginal disks indicated that the effect of double mutation is tissue-specific. In salivary gland chromosomes, affected genes display low H3K9me2 enrichment and are rarely bound by SetDB1 or Su(var)3-9. We suppose that each of these enzymes directly or indirectly controls its own set of gene targets in different organs, and double mutation results in an imbalanced developmental program. This also indicates that SetDB1 and Su(var)3-9 may affect transcription via H3K9-independent mechanisms. Unexpectedly, in double and triple mutants, amount of di- and tri-methylated H3K9 is drastically reduced, but not completely absent. We hypothesize that this residual methylation implies the existence of additional H3K9-specific methyltransferase in Drosophila.

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Data availability

RNA-seq data have been deposited in the GEO under accession number GSE223579.

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This research was supported by a grant from the Russian Science Foundation #23-24-00114.

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  1. Institute of Molecular and Cellular Biology SB RAS, Novosibirsk, 630090, Russia

    Stanislav E. Romanov, Viktor V. Shloma, Daniil A. Maksimov & Dmitry E. Koryakov

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Romanov, S.E., Shloma, V.V., Maksimov, D.A. et al. SetDB1 and Su(var)3-9 are essential for late stages of larval development of Drosophila melanogaster. Chromosome Res 31, 35 (2023). https://doi.org/10.1007/s10577-023-09743-7

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