Abstract |
Modifier mutations of position-effect variegation (PEV) represent a useful tool for a genetic and molecular dissection of genes connected with chromatin regulation in Drosophila. The Su(var)3-9 gene belongs to the group of haplo suppressor loci which manifest a triplo enhancer effect. Mutations show a strong suppressor effect even in the presence of PEV enhancer mutations, indicating a central role of this gene in the regulation of PEV. By molecular analysis, Su(var)3-9 could be correlated with a 2.4 kb transcript which encodes a putative protein of 635 amino acids containing a chromo domain and a region of homology to Enhancer of zeste and trithorax, two antagonistic regulators of the Antennapedia and Bithorax gene complexes, as well as to the human protein ALL-1/Hrx which is implicated in acute leukemias. This region of homology is found in all four proteins at the C-terminus. The homology of Su(var)3-9 to both negative (Polycomb and Enhancer of zeste) and positive (trithorax) regulators of the Antennapedia and Bithorax complexes also suggests similarities in the molecular processes connected with stable transmission of a determined state and the clonal propagation of heterochromatinization.
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Authors | B Tschiersch, A Hofmann, V Krauss, R Dorn, G Korge, G Reuter |
Journal | The EMBO journal
(EMBO J)
Vol. 13
Issue 16
Pg. 3822-31
(Aug 15 1994)
ISSN: 0261-4189 [Print] England |
PMID | 7915232
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- DNA Transposable Elements
- DNA-Binding Proteins
- Drosophila Proteins
- Nuclear Proteins
- Proteins
- Repressor Proteins
- Su(var)3-9 protein, Drosophila
- Transcription Factors
- Trl protein, Drosophila
- E(z) protein, Drosophila
- Polycomb Repressive Complex 2
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Topics |
- Amino Acid Sequence
- Animals
- Base Sequence
- Cloning, Molecular
- DNA Transposable Elements
- DNA-Binding Proteins
(genetics)
- Drosophila
(genetics)
- Drosophila Proteins
- Gene Expression Regulation
- Gene Rearrangement
- Genes, Homeobox
(genetics)
- Genes, Insect
(genetics)
- Genes, Regulator
(genetics)
- Genes, Suppressor
(genetics)
- Genomic Library
- Male
- Molecular Sequence Data
- Nuclear Proteins
- Ocular Physiological Phenomena
- Polycomb Repressive Complex 2
- Proteins
(genetics)
- Repressor Proteins
(genetics)
- Sequence Homology, Amino Acid
- Transcription Factors
- Transcription, Genetic
- Transformation, Genetic
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