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Visceral endoderm function is regulated by quaking and required for vascular development.

Brenda L Bohnsack1, Lihua Lai, Jennifer L Northrop

  • 1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.

Genesis (New York, N.Y. : 2000)
|February 14, 2006
PubMed
Summary

The quaking (qkI) gene is essential for embryonic vascular development. Its variants regulate visceral endoderm function, impacting blood vessel remodeling and survival during gestation.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The quaking (qkI) gene yields three splice variants (qkI-5, -6, -7) with a shared RNA binding, KH domain.
  • Previous research linked the KH domain mutation in the qk(k2) allele to embryonic vascular development defects.

Purpose of the Study:

  • To investigate the role of QKI-5 splice variant in embryonic vascular development.
  • To elucidate the function of quaking gene variants in visceral endoderm and vascular remodeling.

Main Methods:

  • Analysis of qk(l-1)/qk(l-1) mutants lacking the QKI-5 splice variant.
  • Examination of QKI isoform expression in wildtype and mutant yolk sacs.
  • Assessment of visceral endoderm function and rescue experiments with retinoic acid (RA).

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Main Results:

  • qk(l-1)/qk(l-1) mutants exhibited midgestation lethality due to vascular remodeling defects.
  • QKI-5 is required for the expression of qkI-6 and qkI-7 isoforms.
  • Quaking gene regulates visceral endoderm functions including retinoic acid synthesis, endothelial cell proliferation, and endoderm survival.

Conclusions:

  • The quaking gene plays a critical role in regulating visceral endoderm function, which is essential for proper embryonic vascular remodeling.
  • While retinoic acid synthesis is regulated by quaking, exogenous RA could not fully restore visceral endoderm function or vascular remodeling, suggesting other critical roles for quaking.