MicroRNA expression and function in cancer

Ramiro Garzon1, Muller Fabbri, Amelia Cimmino

  • 1Department of Virology, Immunology and Human Genetics, and Comprehensive Cancer Center, the Ohio State University, Columbus, OH 43210, USA.

Insights

MicroRNAs (miRNAs) are small RNAs that regulate genes and play roles in cancer development. miRNA profiling accurately classifies tumors and predicts patient outcomes, offering new diagnostic and therapeutic strategies.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • MicroRNAs (miRNAs) are small non-coding RNAs regulating gene expression in vital cellular processes.
  • Emerging evidence implicates miRNAs in the initiation and progression of human cancers.
  • miRNA dysregulation is increasingly recognized as a hallmark of malignancy.

Purpose of the Study:

  • To summarize miRNA profiling studies in human malignancies.
  • To examine the role of miRNAs in cancer pathogenesis.
  • To discuss the implications of miRNAs for cancer diagnosis and treatment.

Main Methods:

  • Review of high-throughput miRNA profiling studies in cancer patients.
  • Analysis of functional studies investigating miRNA roles (tumor suppressors/oncogenes).
  • Examination of animal models for miRNA function in cancer.

Main Results:

  • miRNA profiling demonstrates high accuracy in tumor classification and outcome prediction.
  • miRNAs function as both tumor suppressors and oncogenes in cancer development.
  • Altered miRNA expression patterns are characteristic of various human malignancies.

Conclusions:

  • miRNA profiling holds significant potential for accurate cancer diagnosis and prognosis.
  • Understanding miRNA roles in pathogenesis can guide novel therapeutic strategies.
  • Targeting miRNAs may offer new avenues for cancer treatment.

Related Concept Videos

MicroRNAs01:22

MicroRNAs

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...
MicroRNAs01:22

MicroRNAs

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...
MicroRNAs01:22

MicroRNAs

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...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...