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Expression quantitative trait locus mapping of extracellular microRNAs in human plasma
Tianxiao Huan1,2, Roby Joehanes1,2, Jian Rong3
1The National Heart, Lung, and Blood Institute's Framingham Heart Study, 73 Mt. Wayte Avenue, Framingham, MA 01702, USA.
Iscience
|October 14, 2024
Summary
This study identifies genetic variants influencing plasma microRNA (ex-miRNA) levels, revealing links between ex-miRNAs, particularly on chromosome 14, and traits like platelet count.
Area of Science:
- Genomics
- Molecular Biology
- Cardiovascular Genetics
Background:
- MicroRNAs (miRNAs) regulate gene expression and are linked to various diseases.
- Extracellular miRNAs (ex-miRNAs) in plasma offer insights into biological processes.
- Understanding the genetic basis of ex-miRNA expression is crucial for disease research.
Purpose of the Study:
- To conduct a genome-wide association study of plasma ex-miRNAs in Framingham Heart Study participants.
- To identify genetic variants (ex-miRNA-eQTLs) associated with ex-miRNA expression.
- To explore the functional implications of these genetic associations for complex traits.
Main Methods:
- Genome-wide association study (GWAS) of plasma ex-miRNAs in 3,743 participants.
- Identification and replication of cis-ex-miRNA-eQTLs (cis-exQTLs).
- Colocalization analysis with whole blood mRNA expression and Mendelian randomization.
Main Results:
- Identified 1,027 cis-exQTLs for 37 ex-miRNAs, with 55% replication.
- Chromosome 14 miRNA clusters (14q23 and 14q32) were major signals, linked to traits including platelet count.
- Confirmed correlations between specific 14q32 ex-miRNAs and platelet count/volume.
Conclusions:
- Genetic factors significantly influence plasma ex-miRNA expression.
- The chromosome 14 miRNA clusters play a substantial role in ex-miRNA regulation and trait association.
- These findings provide a foundation for understanding ex-miRNA roles in complex human traits.
