Loss of phosphatase activity in myotubularin-related protein 2 is associated with Charcot-Marie-Tooth disease type 4B1.

Abstract:

:Mutations in the gene encoding myotubularin-related protein 2 (MTMR2) are responsible for autosomal recessive Charcot-Marie-Tooth disease type 4B1 (CMT4B1), a severe hereditary motor and sensory neuropathy characterized by focally folded myelin sheaths and demyelination. MTMR2 belongs to the myotubularin family, which is characterized by the presence of a phosphatase domain. Myotubularin (MTM), the archetype member of this family, is mutated in X-linked myotubular myopathy. Although MTMR2 and MTM are closely related, they are likely to have different functions. Recent studies revealed that MTM dephosphorylates specifically phosphatidylinositol 3-phosphate. Here we analyze the biochemical properties of the mouse Mtmr2 protein, which shares 97% amino acid identity with human MTMR2. We show that phosphatidylinositol-3-phosphate is also a substrate for Mtmr2, but, unlike myotubularin, Mtmr2 dephosphorylates phosphatidylinositol 3,5-bisphosphate with high efficiency and peak activity at neutral pH. We demonstrate that the known disease-associated MTMR2 mutations lead to dramatically reduced phosphatase activity, suggesting that the MTMR2 phosphatase activity is crucial for the proper function of peripheral nerves in CMT4B1. Expression analysis of Mtmr2 suggests particularly high levels in neurons. Thus, the demyelinating neuropathy CMT4B1 might be triggered by the malfunction of neural membrane recycling, membrane trafficking, and/or endocytic or exocytotic processes, combined with altered axon-Schwann cell interactions. Furthermore, the different biochemical properties of MTM and MTMR2 offer a potential explanation for the different human diseases caused by mutations in their respective genes.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Berger P,Bonneick S,Willi S,Wymann M,Suter U

doi

10.1093/hmg/11.13.1569

subject

Has Abstract

pub_date

2002-06-15 00:00:00

pages

1569-79

issue

13

eissn

0964-6906

issn

1460-2083

journal_volume

11

pub_type

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