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Updated: Jul 15, 2026

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Termination of TGF-beta superfamily signaling through SMAD dephosphorylation--a functional genomic view

Xia Lin1, Yeguang Chen, Anming Meng

  • 1Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston TX 77030, USA.

Journal of Genetics and Genomics = Yi Chuan Xue Bao
|May 2, 2007
PubMed

Insights

Protein phosphatase PPM1A regulates transforming growth factor-beta (TGF-beta) signaling by dephosphorylating R-SMADs. This dephosphorylation is crucial for terminating TGF-beta pathway activity and controlling cellular responses.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Transforming growth factor-beta (TGF-beta) signaling pathways are critical for cellular responses in metazoans.
  • Dysregulation of TGF-beta signaling is implicated in cancer, fibrosis, autoimmune, and cardiovascular diseases.
  • R-SMAD dephosphorylation is a key mechanism for terminating TGF-beta signaling.

Purpose of the Study:

  • To isolate and functionally characterize protein phosphatase PPM1A.
  • To elucidate the role of PPM1A in controlling TGF-beta signaling.
  • To review how SMAD phosphorylation/dephosphorylation dynamics fine-tune TGF-beta pathway outcomes.

Main Methods:

  • Functional genomics
  • Biochemistry
  • Developmental biology

Main Results:

  • Protein phosphatase PPM1A was isolated and functionally characterized.
  • PPM1A plays a critical role in the dephosphorylation of R-SMADs.
  • Dynamic regulation of SMAD phosphorylation by PPM1A fine-tunes TGF-beta signaling strength and duration.

Conclusions:

  • PPM1A is a key regulator of TGF-beta signaling termination.
  • Understanding PPM1A's function offers insights into diseases driven by TGF-beta pathway dysregulation.
  • The dynamic interplay of phosphorylation and dephosphorylation governs TGF-beta mediated physiological outcomes.

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