MicroRNAs (miRNAs) are small non-coding RNAs that function as guide molecules in RNA silencing. Regulation takes place at multiple levels including transcription, Drosha processing, Dicer processing, RNA editing, RNA methylation, uridylation, adenylation, Argonaute modification and RNA decay.
What is the typical function of MicroRNAs in a human cell?
A microRNA (abbreviated miRNA) is a small single-stranded non-coding RNA molecule (containing about 22 nucleotides) found in plants, animals and some viruses, that functions in RNA silencing and post-transcriptional regulation of gene expression.
How does microRNA regulate apoptosis?
miRNA-1290 promotes asiatic acid induced apoptosis by decreasing BCL2 protein level in A549 non small cell lung carcinoma cells. miRNA-133a, downregulated in osteosarcoma, suppresses proliferation and promotes apoptosis by targeting Bcl-xL and Mcl-1.
What is stem cell proliferation?
Cellular proliferation describes an increase in cell number caused by cell growth and division into two identical daughter cells. Production of cells identical to the parent is termed ‘self-renewal. ‘ Unlike other cell types, stem cells have the ability to replicate many times.
What MicroRNAs are and how they play role in regulation of gene expression and gene silencing?
MicroRNAs are small, highly conserved non-coding RNA molecules involved in the regulation of gene expression. The degree and nature of the complementarity between the microRNA and target determine the gene silencing mechanism, slicer-dependent mRNA degradation or slicer-independent translation inhibition.
Which types of cells are highly proliferative?
High rates of proliferation on the other hand are found in skin, mucous membranes, and hematopoetic cells as well as tumors and experimental tumor cell lines (interphase only 1–2 days).
Are stem cells terminally differentiated?
Tissue-resident stem cells are oligopotent since they can form terminally differentiated cells of a specific tissue. Stem cells can be used in cellular therapy to replace damaged cells or to regenerate organs.
How do microRNAs influence gene expression?
miRNAs (microRNAs) are short non-coding RNAs that regulate gene expression post-transcriptionally. They generally bind to the 3′-UTR (untranslated region) of their target mRNAs and repress protein production by destabilizing the mRNA and translational silencing.
How do microRNAs affect gene expression?
microRNA controls gene expression mainly by binding with messenger RNA (mRNA) in the cell cytoplasm. Instead of being translated quickly into a protein, the marked mRNA will be either destroyed and its components recycled, or it will be preserved and translated later.
What are MicroRNAs used for?
MicroRNAs (miRNAs) are a class of non-coding RNAs that play important roles in regulating gene expression. The majority of miRNAs are transcribed from DNA sequences into primary miRNAs and processed into precursor miRNAs, and finally mature miRNAs.
