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siRNAs from an X-linked satellite repeat promote X-chromosome recognition in Drosophila melanogaster.
MedLine Citation:
PMID:  25368194     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Highly differentiated sex chromosomes create a lethal imbalance in gene expression in one sex. To accommodate hemizygosity of the X chromosome in male fruit flies, expression of X-linked genes increases twofold. This is achieved by the male- specific lethal (MSL) complex, which modifies chromatin to increase expression. Mutations that disrupt the X localization of this complex decrease the expression of X-linked genes and reduce male survival. The mechanism that restricts the MSL complex to X chromatin is not understood. We recently reported that the siRNA pathway contributes to localization of the MSL complex, raising questions about the source of the siRNAs involved. The X-linked 1.688 g/cm(3) satellite related repeats (1.688(X) repeats) are restricted to the X chromosome and produce small RNA, making them an attractive candidate. We tested RNA from these repeats for a role in dosage compensation and found that ectopic expression of single-stranded RNAs from 1.688(X) repeats enhanced the male lethality of mutants with defective X recognition. In contrast, expression of double-stranded hairpin RNA from a 1.688(X) repeat generated abundant siRNA and dramatically increased male survival. Consistent with improved survival, X localization of the MSL complex was largely restored in these males. The striking distribution of 1.688(X) repeats, which are nearly exclusive to the X chromosome, suggests that these are cis-acting elements contributing to identification of X chromatin.
Authors:
Debashish U Menon; Cristian Coarfa; Weimin Xiao; Preethi H Gunaratne; Victoria H Meller
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Publication Detail:
Type:  Journal Article     Date:  2014-11-03
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  111     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-22     Completed Date:  -     Revised Date:  2014-12-03    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  16460-5     Citation Subset:  IM    
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