A mutation in the TMD0-L0 region of sulfonylurea receptor-1 (L225P) causes permanent neonatal diabetes mellitus (PNDM).

Abstract:

OBJECTIVE:We sought to examine the molecular mechanisms underlying permanenent neonatal diabetes mellitus (PNDM) in a patient with a heterozygous de novo L225P mutation in the L0 region of the sulfonylurea receptor (SUR)1, the regulatory subunit of the pancreatic ATP-sensitive K(+) channel (K(ATP) channel). RESEARCH DESIGN AND METHODS:The effects of L225P on the properties of recombinant K(ATP) channels in transfected COS cells were assessed by patch-clamp experiments on excised membrane patches and by macroscopic Rb-flux experiments in intact cells. RESULTS:L225P-containing K(ATP) channels were significantly more active in the intact cell than in wild-type channels. In excised membrane patches, L225P increased channel sensitivity to stimulatory Mg nucleotides without altering intrinsic gating or channel inhibition by ATP in the absence of Mg(2+). The effects of L225P were abolished by SUR1 mutations that prevent nucleotide hydrolysis at the nucleotide binding folds. L225P did not alter channel inhibition by sulfonylurea drugs, and, consistent with this, the patient responded to treatment with oral sulfonylureas. CONCLUSIONS:L225P underlies K(ATP) channel overactivity and PNDM by specifically increasing Mg-nucleotide stimulation of the channel, consistent with recent reports of mechanistically similar PNDM-causing mutations in SUR1. The mutation does not affect sulfonylurea sensitivity, and the patient is successfully treated with sulfonylureas.

journal_name

Diabetes

journal_title

Diabetes

authors

Masia R,De Leon DD,MacMullen C,McKnight H,Stanley CA,Nichols CG

doi

10.2337/db06-1746

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

1357-62

issue

5

eissn

0012-1797

issn

1939-327X

pii

db06-1746

journal_volume

56

pub_type

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