MicroRNAs and cancer

Michael T McManus1

  • 1Center for Cancer Research, Massachusetts Institute of Technology, 40 Ames Street, Cambridge, MA 02139, USA. mmcmanus@mit.edu

Insights

MicroRNAs, a class of noncoding RNAs, are implicated in cancer development. This review explores their potential role in oncogenesis, challenging traditional views of cancer gene mutations.

Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Cancer is characterized by loss of cell identity and uncontrolled proliferation.
  • Traditionally, oncogenesis is linked to mutations in protein-encoding genes (oncogenes and tumor suppressors).
  • Noncoding RNAs (ncRNAs) are emerging as critical regulators of cellular processes.

Purpose of the Study:

  • To propose a role for microRNAs in the process of oncogenesis.
  • To highlight the potential shift in understanding cancer development beyond protein-coding genes.
  • To review current data suggesting microRNA involvement in human diseases.

Main Methods:

  • Literature review of recent studies on noncoding RNAs and cancer.
  • Analysis of data linking microRNAs to cellular homeostasis and development.
  • Synthesis of evidence supporting microRNA function in oncogenesis.

Main Results:

  • Noncoding RNAs, particularly microRNAs, play significant roles in biological regulation.
  • Emerging evidence points to microRNAs as key players in human diseases, including cancer.
  • MicroRNAs offer a new perspective on the molecular mechanisms underlying oncogenesis.

Conclusions:

  • MicroRNAs represent a novel class of molecules involved in cancer development.
  • The role of microRNAs in oncogenesis warrants further investigation.
  • Understanding microRNA functions could lead to new diagnostic and therapeutic strategies for cancer.

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...
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)...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...