Comprehensive analysis of human microRNA target networks
Jun-Ichi Satoh1, Hiroko Tabunoki
1Department of Bioinformatics and Molecular Neuropathology, Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan. satoj@my-pharm.ac.jp.
Biodata Mining
|June 21, 2011
Summary
MicroRNAs (miRNAs) regulate gene expression by targeting multiple mRNAs. This study shows that miRNA targets form functional biological networks, not random gene sets, in human cells.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- MicroRNAs (miRNAs) are key regulators of gene expression, influencing cellular functions like development and metabolism.
- While miRNAs target numerous genes, it's unclear if these targets form functional networks or are independent.
Purpose of the Study:
- To investigate whether microRNA (miRNA) targets form functionally associated biological networks.
- To analyze the global microRNAome for network construction.
Main Methods:
- Downloaded human miRNA data from miRBase Release 16.
- Predicted reliable miRNA targets using Diana-microT 3.0 (miTG score ≧ 20).
- Analyzed target gene networks using KeyMolnet, comparing them to canonical human networks.
Main Results:
- Reliable targets were predicted for 273 out of 1,223 human miRNAs.
- KeyMolnet successfully extracted molecular networks for 232 miRNAs.
- The most relevant pathway identified was transcriptional regulation by RB/E2F, associated with adult T-cell lymphoma/leukemia and cancer.
Conclusions:
- Approximately 20% of human miRNAs formed biologically meaningful molecular networks.
- Findings support the hypothesis that miRNA targets constitute functionally associated biological networks in human cells.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
01:22MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
01:22MicroRNAs
MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...