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Published on: August 15, 2019
Cellular and disease functions of the Prader-Willi Syndrome gene MAGEL2
Klementina Fon Tacer1, Patrick Ryan Potts2
1Department of Cell and Molecular Biology, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, U.S.A.
Abstract:
Melanoma antigen L2 (MAGEL2 or MAGE-L2) is a member of the MAGE family of ubiquitin ligase regulators. It is maternally imprinted and often paternally deleted or mutated in the related neurodevelopmental syndromes, Prader-Willi Syndrome (PWS) and Schaaf-Yang Syndrome (SHFYNG). MAGEL2 is highly expressed in the hypothalamus and plays an important role in a fundamental cellular process that recycles membrane proteins from endosomes through the retromer sorting pathway. MAGEL2 is part of a multi-subunit protein complex consisting of MAGEL2, the TRIM27 E3 ubiquitin ligase, and the USP7 deubiquitinating enzyme. The MAGEL2-USP7-TRIM27 (or MUST) complex facilitates the retromer recycling pathway through ubiquitination and activation of the WASH actin nucleation promoting factor. This review provides an overview of the MAGE protein family of ubiquitin ligases regulators and details the molecular and cellular role of MAGEL2 in ubiquitination, actin regulation and endosomal sorting processes, as well as MAGEL2 implications in PWS and SHFYNG disorders. The physiological functions of MAGEL2, elucidated through the study of Magel2 knockout mouse models, are also discussed.
Insights
Melanoma antigen L2 (MAGEL2) regulates membrane protein recycling via the retromer pathway. Its dysfunction is linked to neurodevelopmental disorders like Prader-Willi Syndrome.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Melanoma antigen L2 (MAGEL2) is a ubiquitin ligase regulator involved in endosomal sorting.
- MAGEL2 is maternally imprinted and implicated in Prader-Willi Syndrome and Schaaf-Yang Syndrome.
Purpose of the Study:
- To review the role of MAGEL2 in protein recycling and actin regulation.
- To discuss the implications of MAGEL2 dysfunction in neurodevelopmental disorders.
Main Methods:
- Literature review of MAGEL2 function.
- Analysis of MAGEL2's role in the MUST complex (MAGEL2, USP7, TRIM27).
- Examination of data from Magel2 knockout mouse models.
Main Results:
- MAGEL2 is crucial for the retromer pathway, recycling membrane proteins.
- The MUST complex regulates WASH ubiquitination and activation.
- MAGEL2 dysfunction impacts cellular processes and is linked to PWS and SHFYNG.
Conclusions:
- MAGEL2 is a key regulator of endosomal sorting and actin dynamics.
- Understanding MAGEL2's function is vital for neurodevelopmental disorder research.
- MAGEL2's role in the MUST complex highlights its importance in cellular homeostasis.
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