Tripartite Motif-Containing Protein 32 (TRIM32): What Does It Do for Skeletal Muscle?

Seung Yeon Jeong; Jun Hee Choi; Jooho Kim; Jin Seok Woo; Eun Hui Lee

doi:10.3390/cells12162104

Tripartite Motif-Containing Protein 32 (TRIM32): What Does It Do for Skeletal Muscle?

Cells. 2023 Aug 19;12(16):2104. doi: 10.3390/cells12162104.

Authors

Seung Yeon Jeong^{1

2}, Jun Hee Choi^{1

2}, Jooho Kim^{1

2}, Jin Seok Woo³, Eun Hui Lee^{1

2}

Affiliations

¹ Department of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea.
² Department of Biomedicine & Health Sciences, Graduate School, The Catholic University of Korea, Seoul 06591, Republic of Korea.
³ Department of Physiology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 10833, USA.

Abstract

Tripartite motif-containing protein 32 (TRIM32) is a member of the tripartite motif family and is highly conserved from flies to humans. Via its E3 ubiquitin ligase activity, TRIM32 mediates and regulates many physiological and pathophysiological processes, such as growth, differentiation, muscle regeneration, immunity, and carcinogenesis. TRIM32 plays multifunctional roles in the maintenance of skeletal muscle. Genetic variations in the TRIM32 gene are associated with skeletal muscular dystrophies in humans, including limb-girdle muscular dystrophy type 2H (LGMD2H). LGMD2H-causing genetic variations of TRIM32 occur most frequently in the C-terminal NHL (ncl-1, HT2A, and lin-41) repeats of TRIM32. LGMD2H is characterized by skeletal muscle dystrophy, myopathy, and atrophy. Surprisingly, most patients with LGMD2H show minimal or no dysfunction in other tissues or organs, despite the broad expression of TRIM32 in various tissues. This suggests more prominent roles for TRIM32 in skeletal muscle than in other tissues or organs. This review is focused on understanding the physiological roles of TRIM32 in skeletal muscle, the pathophysiological mechanisms mediated by TRIM32 genetic variants in LGMD2H patients, and the correlations between TRIM32 and Duchenne muscular dystrophy (DMD).

Keywords: DMD; LGMD2H; NHL repeats; TRIM32; muscular dystrophy.

Publication types

Review
Research Support, Non-U.S. Gov't

MeSH terms

Atrophy
Humans
Muscle, Skeletal
Muscular Dystrophies, Limb-Girdle* / genetics
Muscular Dystrophy, Duchenne*
Transcription Factors
Tripartite Motif Proteins / genetics
Ubiquitin-Protein Ligases / genetics

Substances

TRIM32 protein, human
Tripartite Motif Proteins
Transcription Factors
Ubiquitin-Protein Ligases

Supplementary concepts

Limb-girdle muscular dystrophy type 2H

Grants and funding

This work was supported by the Mid-career Researcher Program through National Research Foundation of Korea grants (No. NRF-2022R1A2C1005362 to E.H.L.).