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lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

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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...
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Panning for Long Noncoding RNAs.

Shanshan Zhu1, Xiao-Ou Zhang2, Li Yang3

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Summary
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High-throughput sequencing reveals widespread genome transcription, including long noncoding RNAs (lncRNAs). Understanding lncRNA regulation is crucial for biological insights.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • High-throughput sequencing has uncovered extensive human genome transcription, highlighting the importance of regulatory elements in noncoding regions.
  • Long noncoding RNAs (lncRNAs) present unique challenges due to low expression, poor conservation, and lack of protein-coding potential, complicating their annotation and leading to debate about their functional relevance.
  • Previous research has faced difficulties in fully annotating lncRNA repertoires, hindering a comprehensive understanding of their roles.

Purpose of the Study:

  • To assess the intrinsic features of lncRNAs that have historically challenged their discovery and annotation.
  • To summarize recent advancements in lncRNA discovery utilizing integrated methodologies.
  • To derive new insights for improved characterization of lncRNA expression regulation.

Main Methods:

  • Review and assessment of intrinsic lncRNA features impacting discovery.
  • Integration of diverse methodologies for lncRNA identification and characterization.
  • Analysis of recent progress in understanding lncRNA expression regulation.

Main Results:

  • Widespread transcription of the human genome, including noncoding regions, has been identified.
  • Specific characteristics of lncRNAs (low expression, low conservation, no protein-coding capacity) have historically impeded their study.
  • Integrated approaches are yielding progress in lncRNA discovery and understanding their regulation.

Conclusions:

  • Overcoming challenges in lncRNA annotation is essential for advancing biological understanding.
  • Integrated methodologies offer a path forward for robust lncRNA discovery and characterization.
  • Comprehensive annotation of lncRNA repertoires will form the basis for understanding their pervasive biological functions.