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MicroRNAs01:22

MicroRNAs

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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...
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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...
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Experimental RNAi02:15

Experimental RNAi

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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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RNA Interference01:23

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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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MicroRNA in ovarian function.

S W Maalouf1, W S Liu1, J L Pate2

  • 1Department of Animal Science, Center for Reproductive Biology and Health, The Pennsylvania State University, 324 Henning Building, University Park, PA 16802, USA.

Cell and Tissue Research
|November 13, 2015
PubMed
Summary
This summary is machine-generated.

MicroRNAs regulate ovarian function and fertility by controlling key processes like follicle development and corpus luteum dynamics. Understanding these microRNAs offers potential for new fertility treatments and contraceptives.

Keywords:
Corpus luteumFollicleMicroRNAOvaryReproduction

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Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Genetics

Background:

  • The mammalian ovary is crucial for fertility, requiring precise regulation of follicular development, ovulation, and corpus luteum function.
  • Ovarian dysfunction and infertility can arise from disruptions in these critical reproductive processes.
  • MicroRNAs (miRNAs) are key regulators of gene expression, influencing various developmental and time-sensitive biological functions.

Purpose of the Study:

  • To explore the role of microRNAs (miRNAs) in regulating ovarian function and estrous cycle dynamics.
  • To investigate the expression patterns and functional involvement of miRNAs in key ovarian events such as folliculogenesis and luteogenesis.
  • To assess the potential of miRNAs as therapeutic targets for ovarian dysfunction and infertility.

Main Methods:

  • Analysis of miRNA expression profiles across different ovarian cell types and estrous cycle stages.
  • Investigating the involvement of specific miRNAs in primordial follicle formation, follicular recruitment, atresia, and oocyte-cumulus cell interactions.
  • Examining miRNA expression in luteal cells during different cycle phases and pregnancy recognition.

Main Results:

  • miRNA expression in the ovary is cell-type, function, and estrous cycle stage-dependent.
  • miRNAs are implicated in primordial follicle development, follicular recruitment and selection, atresia, oocyte-cumulus interactions, granulosa cell function, and luteinization.
  • Differential miRNA expression in luteal cells suggests roles in development, maintenance, and regression, including during maternal recognition of pregnancy.

Conclusions:

  • Understanding ovarian miRNA expression patterns and functions is vital for reproductive health.
  • miRNAs present promising targets for developing novel therapeutics to treat ovarian dysfunction and enhance fertility.
  • Further research into ovarian miRNAs may lead to the development of advanced contraceptive strategies.