Ontology highlight
ABSTRACT:
PROVIDER: PRJNA899374 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR22284832_1.fastq.gz | Fastqsanger.gz | |||
| SRR22284832_2.fastq.gz | Fastqsanger.gz | |||
| SRR22284833_1.fastq.gz | Fastqsanger.gz | |||
| SRR22284833_2.fastq.gz | Fastqsanger.gz | |||
| SRR22284834_1.fastq.gz | Fastqsanger.gz |
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Project description: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, or all three proteins 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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Project description:One of the histone modifications involved in gene silencing is H3K9 methylation, which is found in the chromosomes across different eukaryotes and controlled by SU(VAR)3-9 and its orthologs. Although SU(VAR)3-9 was discovered over two decades ago, little is known about the details of its chromosomal distribution pattern and effect on gene regulation during germ cells development. To fill in this gap, we used RNA-Seq approach to investigate the effect of Su(var)3-9 mutation on gene expression during Drosophila spermatogenesis.
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