Cited by 86Genomics and Chromatin DynamicsEpigenetics and DNA MethylationChromosomal and Genetic Variations

Multiple SET Methyltransferases Are Required to Maintain Normal Heterochromatin Domains in the Genome of Drosophila melanogaster

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Brower-Toland, Brent, Riddle, Nicole C, Jiang, Hongmei, Huisinga, Kathryn L, Elgin, Sarah C R·2009·Genetics

Abstract

Methylation of histone H3 lysine 9 (H3K9) is a key feature of silent chromatin and plays an important role in stabilizing the interaction of heterochromatin protein 1 (HP1) with chromatin. Genomes of metazoans such as the fruit fly Drosophila melanogaster generally encode three types of H3K9-specific SET domain methyltransferases that contribute to chromatin homeostasis during the life cycle of the organism. SU(VAR)3-9, dG9a, and dSETDB1 all function in the generation of wild-type H3K9 methylation levels in the Drosophila genome. Two of these enzymes, dSETDB1 and SU(VAR)3-9, govern heterochromatin formation in distinct but overlapping patterns across the genome. H3K9 methylation in the small, heterochromatic fourth chromosome of D. melanogaster is governed mainly by dSETDB1, whereas dSETDB1 and SU(VAR)3-9 function in concert to methylate H3K9 in the pericentric heterochromatin of all chromosomes, with dG9a having little impact in these domains, as shown by monitoring position effect variegation. To understand how these distinct heterochromatin compartments may be differentiated, we examined the developmental timing of dSETDB1 function using a knockdown strategy. dSETDB1 acts to maintain heterochromatin during metamorphosis, at a later stage in development than the reported action of SU(VAR)3-9. Surprisingly, depletion of both of these enzymes has less deleterious effect than depletion of one. These results imply that dSETDB1 acts as a heterochromatin maintenance factor that may be required for the persistence of earlier developmental events normally governed by SU(VAR)3-9. In addition, the genetic interactions between dSETDB1 and Su(var)3-9 mutations emphasize the importance of maintaining the activities of these histone methyltransferases in balance for normal genome function.

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  1. Sambrook, J., and D. W. Russell, 2001 Molecular Cloning: A Labora- tory Manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY.

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Authors
Brower-Toland, B., Riddle, N. C., Jiang, H., Huisinga, K. L., & Elgin, S. C. R.
Affiliations
  • Department of Biology , Washington University, St. Louis, Missouri 63130 and
  • Washington University in St. Louis (US)
  • Northwestern University (US)
Corresponding author
Elgin, Sarah C R
Venue
Genetics
Published
2009-04-01
Volume
181
Issue
4
Pages
1303-1319
ISSN
  • 0016-6731 (ISSN-L)
  • 1943-2631
OpenAlex
W2171405275
Cited by
86
References
45
Citations by year
2026: 1 · 2025: 2 · 2024: 4 · 2023: 4 · 2022: 3 · 2021: 5 · 2020: 4 · 2019: 9 · 2018: 6 · 2017: 3 · 2016: 6 · 2015: 7 · 2014: 6 · 2013: 7 · 2012: 5
FWCI
2.55
Type
journal article
Language
en
Open access
Locations
  • Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01 GM68388, F32GM078833, R01GM068388)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
Keywords
H3K9 methylation, heterochromatin, Drosophila melanogaster, Su(var)3-9, HP1, position effect variegation, pericentromeric heterochromatin, chromosome 4, metamorphosis, developmental timing, genetic interactions
MeSH terms
Animals, Drosophila melanogaster, Epistasis, Genetic, Heterochromatin, Larva, Models, Biological, Phenotype, Histone-Lysine N-Methyltransferase, Repressor Proteins, Mutagenesis, Gene Expression Regulation, Developmental, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Drosophila Proteins, Animals, Genetically Modified, Chromatin Assembly and Disassembly, Genome, Insect, Mutant Proteins

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