Human microRNA-155 on Chromosome 21 Differentially Interacts with Its Polymorphic Target in the AGTR1 3' Untranslated Region: A Mechanism for Functional Single-Nucieotide Polymorphisms Related to Phenotypes

Human microRNA-155 on Chromosome 21 Differentially Interacts with Its Polymorphic Target in the AGTR1 3' Untranslated Region: A Mechanism for Functional Single-Nucieotide Polymorphisms Related to Phenotypes

Animal microRNAs (miRNAs) regulate gene expression through base pairing to their targets within the 3' untranslated region (UTR) of protein-coding genes. Single-nucleotide polymorphisms (SNPs) located within such target sites can affect miRNA regulation. We mapped annotated SNPs onto a collecti...

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Published in:American journal of human genetics Vol. 81; no. 2; pp. 405 - 413
Main Authors: Sethupathy, P, Borel, C, Gagnebin, M, Grant, G R, Deutsch, S, Elton, T S, Hatzigeorglou, A G, Antonarakis, SE
Format: Journal Article
Language:English
Published: 01-08-2007
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Summary:Animal microRNAs (miRNAs) regulate gene expression through base pairing to their targets within the 3' untranslated region (UTR) of protein-coding genes. Single-nucleotide polymorphisms (SNPs) located within such target sites can affect miRNA regulation. We mapped annotated SNPs onto a collection of experimentally supported human miRNA targets. Of the 143 experimentally supported human target sites, 9 contain 12 SNPs. We further experimentally investigated one of these target sites for hsa-miR-155, within the 3' UTR of the human AGTR1 gene that contains SNP rs5186. Using reporter silencing assays, we show that hsa-miR-155 down-regulates the expression of only the 1166A, and not the 1166C, allele of rs5186. Remarkably, the 1166C allele has been associated with hypertension in many studies. Thus, the 1166C allele may be functionally associated with hypertension by abrogating regulation by hsa-miR-155, thereby elevating AGTR1 levels. Since hsa-miR-155 Is on chromosome 21, we hypothesize that the observed lower blood pressure in trisomy 21 Is partially caused by the overexpresslon of hsa-miR-155 leading to allele-speclfic underexpression of AGTR1. Indeed, we have shown in fibroblasts from monozygotlc twins discordant for trisomy 21 that levels of AGTR1 protein are lower in trisomy 21.
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ISSN:0002-9297
DOI:10.1086/519979