Maturity-onset diabetes of the young caused by a balanced translocation where the 20q12 break point results in disruption upstream of the coding region of hepatocyte nuclear factor-4alpha (HNF4A) gene.
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Authors
Gloyn, A. L.
Ellard, Sian
Shepherd, Maggie
Howell, R. T.
Parry, E. M.
Jefferson, A.
Levy, E. R.
Hattersley, Andrew T.
Issue Date
2002-07
Type
Case Report
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Language
en
Keywords
Wessex Classification Subject Headings::Oncology. Pathology.::Genetics , Wessex Classification Subject Headings::Endocrinology::Diabetes
Alternative Title
Monogenic human disorders have been used as paradigms for complex genetic disease and as tools for establishing important insights into mechanisms of gene regulation and transcriptional control. Maturity-onset diabetes of the young (MODY) is a monogenic dominantly inherited form of diabetes that is characterized by defective insulin secretion from the pancreatic beta-cells. A wide variety of mutation types in five different genes have been identified that result in this condition. There have been no reports of a chromosome deletion or translocation resulting in MODY. We report a pedigree where MODY cosegregates with a balanced translocation [karyotype 46, XX t(3;20) (p21.2;q12)]. The chromosome 20 break point, 20q12, is within the region of one of the known MODY genes, hepatocyte nuclear factor-4alpha (HNF4A). Fluorescence in situ hybridization analysis demonstrated that the break point does not disrupt the coding region of this gene, but it lies at least 6 kb upstream of the conventional promoter (P1). We propose that this mutation disrupts the spatial relationship between the recently described alternate distal pancreatic promoter (P2) and HNF4A. This is the first case of MODY due to a balanced translocation, and it provides evidence to confirm the crucial role of an upstream regulator of HNF4A gene expression in the beta-cell.
Description
Citation
Maturity-onset diabetes of the young caused by a balanced translocation where the 20q12 break point results in disruption upstream of the coding region of hepatocyte nuclear factor-4alpha (HNF4A) gene. 2002, 51 (7):2329-33 Diabetes
Publisher
Highwire
License
Archived with thanks to Diabetes
Journal
Diabetes
Volume
Issue
PubMed ID
DOI
ISSN
0012-1797