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Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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X-chromosome...
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Overexpressing Long Noncoding RNAs Using Gene-activating CRISPR
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Epigenetics of imprinted long noncoding RNAs.

Faizaan Mohammad1, Tanmoy Mondal, Chandrasekhar Kanduri

  • 1Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden.

Epigenetics
|July 21, 2009
PubMed
Summary

Long noncoding RNAs (lncRNAs) like Xist, Kcnq1ot1, and Air are crucial for organizing chromatin architecture and epigenetic memory. These molecules interact with chromatin and recruit machinery to silence gene expression through distinct mechanisms.

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Area of Science:

  • Epigenetics and Molecular Biology
  • Noncoding RNA Function
  • Chromatin Organization

Background:

  • Noncoding RNAs (ncRNAs) are increasingly recognized for their roles in chromatin organization and epigenetic memory.
  • Xist RNA is a well-established example of an ncRNA regulating gene expression via chromatin structure modulation.
  • Long ncRNAs (lncRNAs) like Kcnq1ot1 and Air are implicated in the transcriptional silencing of multiple genes within imprinted gene clusters.

Purpose of the Study:

  • To review and compare the mechanisms by which Kcnq1ot1 and Air lncRNAs mediate gene silencing.
  • To elucidate the distinct roles of lncRNA transcription and the RNA molecule itself in silencing.
  • To propose a model for the differential gene silencing activities of Kcnq1ot1 and Air.

Main Methods:

  • Literature review of recent evidence on Kcnq1ot1, Air, and Xist function.
  • Comparative analysis of lncRNA-mediated gene silencing pathways.
  • Integration of findings to propose mechanistic models.

Main Results:

  • Kcnq1ot1 and Air interact with chromatin and recruit the chromatin-modifying machinery.
  • Kcnq1ot1 RNA appears critical for bidirectional gene silencing in the Kcnq1 domain, similar to Xist.
  • Air's silencing mechanism differs: transcription is key for overlapping genes, while Air RNA silences non-overlapping genes, akin to Kcnq1ot1 and Xist.

Conclusions:

  • Kcnq1ot1 and Air exhibit both similarities and significant differences in their gene silencing strategies.
  • Kcnq1ot1 functions analogously to Xist in mediating bidirectional silencing.
  • Air employs a dual mechanism involving transcriptional activity and RNA-mediated silencing for distinct gene sets.