UMMS Affiliation
Program in Molecular Medicine; RNA Therapeutics Institute
Publication Date
2015-09-22
Document Type
Article
Subjects
Caenorhabditis elegans; MicroRNAs
Disciplines
Developmental Biology | Genetics and Genomics | Molecular Biology | Molecular Genetics
Abstract
MicroRNAs are regulators of gene expression whose functions are critical for normal development and physiology. We have previously characterized mutations in a Caenorhabditis elegans microRNA-specific Argonaute ALG-1 (Argonaute-like gene) that are antimorphic [alg-1(anti)]. alg-1(anti) mutants have dramatically stronger microRNA-related phenotypes than animals with a complete loss of ALG-1. ALG-1(anti) miRISC (microRNA induced silencing complex) fails to undergo a functional transition from microRNA processing to target repression. To better understand this transition, we characterized the small RNA and protein populations associated with ALG-1(anti) complexes in vivo. We extensively characterized proteins associated with wild-type and mutant ALG-1 and found that the mutant ALG-1(anti) protein fails to interact with numerous miRISC cofactors, including proteins known to be necessary for target repression. In addition, alg-1(anti) mutants dramatically overaccumulated microRNA* (passenger) strands, and immunoprecipitated ALG-1(anti) complexes contained nonstoichiometric yields of mature microRNA and microRNA* strands, with some microRNA* strands present in the ALG-1(anti) Argonaute far in excess of the corresponding mature microRNAs. We show complex and microRNA-specific defects in microRNA strand selection and microRNA* strand disposal. For certain microRNAs (for example mir-58), microRNA guide strand selection by ALG-1(anti) appeared normal, but microRNA* strand release was inefficient. For other microRNAs (such as mir-2), both the microRNA and microRNA* strands were selected as guide by ALG-1(anti), indicating a defect in normal specificity of the strand choice. Our results suggest that wild-type ALG-1 complexes recognize structural features of particular microRNAs in the context of conducting the strand selection and microRNA* ejection steps of miRISC maturation.
Keywords
ALG-1, Argonaute, microRNA, microRNA*, passenger
Rights and Permissions
Publisher PDF posted as allowed by the publisher's author rights policy at http://www.pnas.org/site/aboutpnas/authorfaq.xhtml.
DOI of Published Version
10.1073/pnas.1506576112
Source
Proc Natl Acad Sci U S A. 2015 Sep 22;112(38):E5271-80. doi: 10.1073/pnas.1506576112. Epub 2015 Sep 8. Link to article on publisher's site
Journal/Book/Conference Title
Proceedings of the National Academy of Sciences of the United States of America
Related Resources
PubMed ID
26351692
Repository Citation
Zinovyeva, Anna Y.; Veksler-Lublinsky, Isana; Vashisht, Ajay A.; Wohlschlegel, James A.; and Ambros, Victor R., "Caenorhabditis elegans ALG-1 antimorphic mutations uncover functions for Argonaute in microRNA guide strand selection and passenger strand disposal" (2015). Program in Molecular Medicine Publications and Presentations. 39.
https://escholarship.umassmed.edu/pmm_pp/39