[Diabetes mellitus caused by a mutation of glucokinase gene. Report of an affected family].

Abstract:

:Maturity-Onset Diabetes of the Young (MODY) refers to a heterogeneous group of monogenic diabetes. Unlike other types of MODY characterized by genetic defects in transcription factors, MODY 2 is triggered by metabolic alterations caused by mutations of glucokinase (GCK), the first enzyme of the glycolytic pathway. We report a three-generation Chilean family with multiple cases affected with this disease. The index case is a patient who presented severe neonatal hyperglycemia (831 mg/dl, without ketosis) requiring continuous infusion of insulin, which was suspended after 48 hours with normalization of blood glucose. Subsequently, continuous glucose monitoring at 4 months of age revealed 47% of tissue glucose levels above 140 mg/dl, with fasting glucose levels between 120 and 166 mg/dl. The genetic analysis revealed a previously reported mutation in heterozygous state of the GCK gene (c.148C>T; p.His50Tyr). This mutation was also identified in more than one affected relative in the last two generations, with a transmission pattern suggestive of dominant inheritance. GCK gene sequencing led to a correct molecular diagnosis of MODY 2 while bioinformatic analysis indicated the possible molecular causes of the enzyme dysfunction. The knowledge of the molecular diagnosis allowed an adequate medical treatment for this disease.

journal_name

Rev Med Chil

journal_title

Revista medica de Chile

authors

Pollak C F,Lagos L M,Santos M JL,Poggi H,Urzúa C A,Rumié C H

doi

10.4067/s0034-98872017000901203

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

1203-1207

issue

9

eissn

0034-9887

issn

0717-6163

pii

S0034-98872017000901203

journal_volume

145

pub_type

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