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Genetic evidence that formins function within the nucleus

D C Chan1, P Leder

  • 1Department of Genetics, Harvard Medical School, and Howard Hughes Medical Institute, Boston, Massachusetts 02115, USA.

The Journal of Biological Chemistry
|September 20, 1996
PubMed
Summary
This summary is machine-generated.

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Nuclear localization is crucial for formin function in embryonic development. Truncated formins lacking a carboxyl-terminal region are cytosolic, leading to limb and kidney defects.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The murine limb deformity (ld) locus encodes formins, essential for embryonic limb and kidney development.
  • Previous studies suggested formins function within the nucleus, based on their localization and biochemical properties.

Purpose of the Study:

  • To investigate the role of nuclear localization in formin function.
  • To identify the specific region of formin responsible for nuclear import.

Main Methods:

  • Molecular and biochemical studies on three distinct ld alleles (ldTgHd, ldTgBri, ldIn2).
  • Subcellular fractionation analysis to determine protein localization (nuclear vs. cytosolic).
  • Phenotypic analysis of skeletal defects in affected mouse limbs.

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Main Results:

  • Two alleles (ldTgHd, ldTgBri) produced COOH-truncated formins lacking 110 amino acids, which were exclusively cytosolic.
  • A third allele (ldIn2) produced a less truncated formin (lacking 42 amino acids) with a partial localization defect.
  • Milder skeletal defects were observed in ldIn2 mice compared to ldTgBri mice, correlating with the severity of the localization defect.

Conclusions:

  • A small region in the carboxyl terminus of formin is essential for its nuclear localization.
  • Nuclear localization of formin plays a significant role in its function during embryonic development, particularly in limb formation.