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An evolutionarily conserved long noncoding RNA TUNA controls pluripotency and neural lineage commitment.

Nianwei Lin1, Kung-Yen Chang1, Zhonghan Li1

  • 1Program for RNA Biology, Sanford-Burnham Medical Research Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.

Molecular Cell
|February 18, 2014
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Researchers identified 20 long intergenic noncoding RNAs (lincRNAs) crucial for maintaining pluripotency in mouse embryonic stem cells (mESCs). The lincRNA TUNA is essential for pluripotency and neural differentiation, with implications for neurological function.

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Area of Science:

  • * Molecular Biology
  • * Developmental Biology
  • * Genetics

Background:

  • * Long noncoding RNAs (lincRNAs) are increasingly recognized for their regulatory roles in cellular processes.
  • * The function of many lincRNAs, particularly in stem cell maintenance and differentiation, remains largely uncharacterized.
  • * Understanding the role of specific lincRNAs is crucial for advancing stem cell biology and regenerative medicine.

Purpose of the Study:

  • * To conduct an unbiased, genome-scale screen to identify lincRNAs essential for maintaining pluripotency in mouse embryonic stem cells (mESCs).
  • * To investigate the molecular mechanisms by which identified lincRNAs, specifically TUNA, regulate pluripotency and differentiation.
  • * To explore the evolutionary conservation and potential association of TUNA with neurological functions and diseases.

Main Methods:

  • * Generation of a comprehensive shRNA library targeting mouse lincRNAs.
  • * Loss-of-function screening in mESCs to identify essential lincRNAs for pluripotency.
  • * Biochemical assays to characterize the TUNA-RNA-binding protein (RBP) complex and its genomic localization.
  • * Functional studies in mESCs and zebrafish to assess the impact of TUNA knockdown on differentiation and neurological function.
  • * Analysis of TUNA expression in human brain samples from Huntington's disease patients.

Main Results:

  • * Identification of 20 lincRNAs critical for maintaining mESC pluripotency.
  • * The lincRNA TUNA (Tcl1 Upstream Neuron-Associated lincRNA, also known as megamind) was found to be essential for pluripotency.
  • * TUNA forms a complex with three RBPs, localizing to the promoters of key pluripotency genes (Nanog, Sox2, Fgf4).
  • * Knockdown of TUNA or associated RBPs impaired neural differentiation of mESCs.
  • * TUNA exhibits significant evolutionary sequence conservation and restricted expression in vertebrate central nervous systems (CNS).
  • * Tuna knockdown in zebrafish led to impaired locomotor function.
  • * TUNA expression levels in human Huntington's disease patient brains correlated with disease severity.

Conclusions:

  • * The lincRNA TUNA is a vital regulator of pluripotency and neural differentiation in ESCs.
  • * The TUNA-RBP complex plays a key role in regulating the expression of pluripotency genes.
  • * TUNA's conserved role across species suggests its importance in vertebrate neurological function.
  • * TUNA may serve as a potential biomarker or therapeutic target for neurological disorders like Huntington's disease.