The microRNAs in an Ancient Protist Repress the Variant-Specific Surface Protein Expression by Targeting the Entire Coding Sequence

PLoS Pathogens

Ashesh A. Saraiya¹  Wei Li¹  Ching C. Wang¹  Chuan H. Chang²  Jesse Wu² 

[1] Department of Pharmaceutical Chemistry, University of California-San Francisco, San Francisco, California, United States of America;Institute for Biomedical Informatics, National Yang-Ming University, Taipei, Taiwan

关键词: MicroRNAs;    Giardia;    Trophozoites;    Untranslated regions;    Gene prediction;    Giardia lamblia;    Messenger RNA;    Sequence motif analysis;   

DOI  :  10.1371/journal.ppat.1003791

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

microRNAs (miRNA) have been detected in the deeply branched protist, Giardia lamblia, and shown to repress expression of the family of variant-specific surface proteins (VSPs), only one of which is expressed in Giardia trophozoite at a given time. Three next-generation sequencing libraries of Giardia Argonaute-associated small RNAs were constructed and analyzed. Analysis of the libraries identified a total of 99 new putative miRNAs with a size primarily in the 26 nt range similar to the size previously predicted by the Giardia Dicer crystal structure and identified by our own studies. Bioinformatic analysis identified multiple putative miRNA target sites in the mRNAs of all 73 VSPs. The effect of miRNA target sites within a defined 3′-region were tested on two vsp mRNAs. All the miRNAs showed partial repression of the corresponding vsp expression and were additive when the targeting sites were separately located. But the combined repression still falls short of 100%. Two other relatively short vsp mRNAs with 15 and 11 putative miRNA target sites identified throughout their ORFs were tested with their corresponding miRNAs. The results indicate that; (1) near 100% repression of vsp mRNA expression can be achieved through the combined action of multiple miRNAs on target sites located throughout the ORF; (2) the miRNA machinery could be instrumental in repressing the expression of vsp genes in Giardia; (3) this is the first time that all the miRNA target sites in the entire ORF of a mRNA have been tested and shown to be functional.

【 授权许可】

CC BY