Transcriptional Repression of Euchromatic Genes by Drosophila Heterochromatin Protein 1 and Histone Modifiers

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 98; no. 20; pp. 11423 - 11427
• Main Authors: Hwang, Kyu-Kye, Eissenberg, Joel C., Worman, Howard J.
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences 25.09.2001; National Acad Sciences; The National Academy of Sciences
• Subjects: Animals; Biological Sciences; Chromosomal Proteins, Non-Histone - genetics; Chromosomes; DNA, Complementary - genetics; Drosophila; Drosophila melanogaster - genetics; Euchromatin; Genes; Genetic Carrier Screening; Genetic mutation; Genetics; Heterochromatin; Heterochromatin - genetics; heterochromatin protein 1; Histones; Histones - genetics; Larva; Larvae; Mutation; Proteins; Repression; RNA; Studies; Transcription, Genetic
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.211303598

In Drosophila, heterochromatin protein 1 (HP1) suppresses the expression of euchromatic genes that are artificially translocated adjacent to heterochromatin by expanding heterochromatin structure into neighboring euchromatin. The purpose of this study was to determine whether HP1 functions as a transcriptional repressor in the absence of chromosome rearrangements. Here, we show that Drosophila HP1 normally represses the expression of four euchromatic genes in a dosage-dependent manner. Three genes regulated by HP1 map to cytological region 31 of chromosome 2, which is immunostained by anti-HP1 antibodies in the salivary gland. The repressive effect of HP1 is decreased by mutation in Su(var)3-9, whose mammalian orthologue encodes a histone H3 methyltransferase and mutation in Su(var)2-1, which is correlated with histone H4 deacetylation. These data provide genetic evidence that an HP1-family protein represses the expression of euchromatic genes in a metazoan, and that histone modifiers cooperate with HP1 in euchromatic gene repression.