A novel genetic mutation in a Portuguese family with GCK-MODY
-
Cláudia Almeida
,
Sónia Regina Silva
Abstract
Introduction: Maturity-onset diabetes of the young (MODY) is a genetically heterogeneous form of diabetes mellitus, with autosomal dominant inheritance. It accounts for 2%–5% of all diabetes cases. Glucokinase-MODY is the second most frequent form, which has been shown to be the result of mutations in the glucokinase (GCK) gene. It mostly presents with mild hyperglycemia, and, usually, no diabetes-related complications occur.
Case report: A 9-year-old female was admitted to the Endocrine Clinic to study her fasting hyperglycemia. Despite her obesity (body mass index 28 kg/m2), her physical examination had no other abnormalities. Blood tests showed a 6.3% hemoglobin A1c, with normal standard oral glucose tolerance test result, normal insulin value and normal C-peptide level. Insulin autoantibodies and antibodies against glutamate decarboxylase were negative. She began metformin and adequate diet. She had a strongly positive family history for diabetes. The patient’s mother, uncle, grandfather, great-aunt and great-grandfather on her mother’s side were diagnosed with diabetes. Complete sequencing of the GCK gene, carried out in the patient, identified a novel mutation c.1268T>A (p.Phe423Tyr) in exon 10 of the gene GCK in heterozygosity. Further studies revealed the same mutation in her mother and maternal grandfather.
Conclusion: Finding the same mutation in three different generations of diabetic patients, in the same family, is highly suggestive of its pathogenicity. To the authors’ knowledge, this is the first time it is described in the literature. Correct molecular diagnosis of MODY predicts better the clinical course of diabetes and facilitates individualised management.
References
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©2014 by Walter de Gruyter Berlin Boston
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- A novel genetic mutation in a Portuguese family with GCK-MODY
- Permanent neonatal diabetes mellitus in monozygotic twins achieving low-dose sulfonylurea therapy
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Articles in the same Issue
- Masthead
- Masthead
- Editorials
- Editorial
- Consensus, guidelines and reviews
- Review article
- Adaptation of glucose metabolism to fasting in young children with infectious diseases: a perspective
- Images in pediatric endocrinology
- Coexistence of testicular microlithiasis with parathyroid adenoma in an obese child
- Original articles
- Remission of hypertension and electrolyte abnormalities following renal transplantation in a patient with apparent mineralocorticoid excess well documented throughout childhood
- Effects of metformin in children and adolescents with Prader-Willi syndrome and early-onset morbid obesity: a pilot study
- Glycemic control in familial vs. sporadic type 1 diabetes patients over 5 years
- Clinical and laboratory features of temporary brittle bone disease
- Age of thelarche and menarche in contemporary US females: a cross-sectional analysis
- Teriparatide (rhPTH) treatment in children with syndromic hypoparathyroidism
- Retinol and retinyl palmitate in fetal mice liver: sexual dimorphism
- Skeletal maturation and predicted adult height in children with premature adrenarche
- Homozygosity for a DTDST mutation in a child with multiple epiphyseal dysplasia
- Body composition in young patients with galactose metabolic disorders: a preliminary report
- Detection of vascular risk markers in children and adolescents with type 1 diabetes
- X-linked recessive nephrogenic diabetes insipidus: a clinico-genetic study
- Factors influencing neonatal thyroid-stimulating hormone concentrations as a measure of population iodine status
- Pediatric idiopathic intracranial hypertension and the underlying endocrine-metabolic dysfunction: a pilot study
- Patient reports
- Hypothalamic hamartoma associated with central precocious puberty and growth hormone deficiency
- A pediatric patient with Cushing syndrome caused by ectopic ACTH syndrome and concomitant pituitary incidentalomas
- A novel genetic mutation in a Portuguese family with GCK-MODY
- Permanent neonatal diabetes mellitus in monozygotic twins achieving low-dose sulfonylurea therapy
- Hypocalcemia in a paediatric case: from the clinical features to diagnosis
- A rare case of osteogenesis imperfecta combined with complete tooth loss
- Iatrogenic acute pancreatitis due to hypercalcemia in a child with pseudohypoparathyroidism
- Clinical expression of familial Williams-Beuren syndrome in a Turkish family
- The first report of cabergoline-induced immune hemolytic anemia in an adolescent with prolactinoma
- Low-level hyperinsulinism with hypoglycemic spells in an infant with mosaic Turner syndrome and mild Kabuki-like phenotype: a case report and review of the literature
- Multiple cutaneous hemangiomas in a patient with combined pituitary hormone deficiency
- Premature thelarche related to fennel tea consumption?
- A novel insertion in the FOXL2 gene in a Chilean patient with blepharophimosis ptosis epicanthus inversus syndrome type I
- Zellweger syndrome: prenatal and postnatal growth failure with epiphyseal stippling
- Marine-Lenhart syndrome in a young girl
- Novel AQP2 mutation causing congenital nephrogenic diabetes insipidus: challenges in management during infancy
- Letter to the Editors
- Mutational analysis of KISS1 and KISS1R in idiopathic central precocious puberty
- Carotid intima media thickness and echocardiography in risk stratification of obese adolescents with non-alcoholic fatty liver disease: what is the “right” approach?
- Vitamin D and the heart: what is the truth?
