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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

PPM1D430, a novel alternative splicing variant of the human PPM1D, can dephosphorylate p53 and exhibits specific

Yoshiro Chuman1, Wataru Kurihashi, Yohei Mizukami

  • 1Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.

Journal of Biochemistry
|October 11, 2008
PubMed

Insights

A new PPM1D splicing variant, PPM1D430, is induced by DNA damage and dephosphorylates p53. This variant, found in testes and leukocytes, may play specific roles in immune response and spermatogenesis.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The protein phosphatase PPM1D is induced by DNA damage, and its deficiency causes defects in spermatogenesis and lymphoid cells.
  • The precise mechanisms behind these PPM1D-related phenotypes are not fully understood.

Purpose of the Study:

  • To identify and characterize a novel alternative splicing variant of human PPM1D.
  • To investigate the function and expression of this variant, denoted PPM1D430, in relation to DNA damage response and cellular processes.

Main Methods:

  • Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) was used to analyze mRNA levels.
  • In vitro phosphatase assays and RNA interference were employed to assess protein function.
  • RT-PCR analysis of a human tissue cDNA panel was performed for expression profiling.

Main Results:

  • A new splicing variant, PPM1D430, was identified at both mRNA and protein levels, differing from the known PPM1D605 by a 10-amino acid stretch.
  • PPM1D430 mRNA is induced by genotoxic stress in a p53-dependent manner.
  • PPM1D430 dephosphorylates Ser15 of p53 in vitro and in vivo, and is expressed specifically in testes and leukocytes, unlike the ubiquitous PPM1D605.

Conclusions:

  • PPM1D430 represents a distinct functional entity with a specific expression pattern.
  • The findings suggest that PPM1D430 may have specialized roles in spermatogenesis and immune responses, potentially explaining phenotypes observed in PPM1D-deficient models.

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