SOX10 regulates an alternative promoter at the Charcot-Marie-Tooth disease locus MTMR2.

Abstract:

:Schwann cells are the myelinating glia of the peripheral nervous system and dysfunction of these cells causes motor and sensory peripheral neuropathy. The transcription factor SOX10 is critical for Schwann cell development and maintenance, and many SOX10 target genes encode proteins required for Schwann cell function. Loss-of-function mutations in the gene encoding myotubularin-related protein 2 (MTMR2) cause Charcot-Marie-Tooth disease type 4B1 (CMT4B1), a severe demyelinating peripheral neuropathy characterized by myelin outfoldings along peripheral nerves. Previous reports indicate that MTMR2 is ubiquitously expressed making it unclear how loss of this gene causes a Schwann cell-specific phenotype. To address this, we performed computational and functional analyses at MTMR2 to identify transcriptional regulatory elements important for Schwann cell expression. Through these efforts, we identified an alternative, SOX10-responsive promoter at MTMR2 that displays strong regulatory activity in immortalized rat Schwann (S16) cells. This promoter directs transcription of a previously unidentified MTMR2 transcript that is enriched in mouse Schwann cells compared to immortalized mouse motor neurons (MN-1), and is predicted to encode an N-terminally truncated protein isoform. The expression of the endogenous transcript is induced in a heterologous cell line by ectopically expressing SOX10, and is nearly ablated in Schwann cells by impairing SOX10 function. Intriguingly, overexpressing the two MTMR2 protein isoforms in HeLa cells revealed that both localize to nuclear puncta and the shorter isoform displays higher nuclear localization compared to the longer isoform. Combined, our data warrant further investigation of the truncated MTMR2 protein isoform in Schwann cells and in CMT4B1 pathogenesis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Fogarty EA,Brewer MH,Rodriguez-Molina JF,Law WD,Ma KH,Steinberg NM,Svaren J,Antonellis A

doi

10.1093/hmg/ddw233

subject

Has Abstract

pub_date

2016-09-15 00:00:00

pages

3925-3936

issue

18

eissn

0964-6906

issn

1460-2083

pii

ddw233

journal_volume

25

pub_type

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