Genomic coordinate (human 12:120,978,543 HNF1A).
Cytoband (human 12q24.31 HNFIA).
Intraband %= 13.3% HNFIA
ClinVar = 2,300 HNF1A variants reported.
OMIM’ genes @ 12q24.31 = 22 genes
Hyperbolic Umbilic Chromosome-12 is 1,200 genes.
Chromosome-12 Cytoband: WG2B2GC_CBG5B2G6 (12/29)
Here I 🎁 present: “HNFIA Pleiotropic Disorders“, Victor McKusick, Mendelian Inheritance in Man’, 1966. (HNFIA)
INTRODUCTION.
The pleiotropic disorders caused by mutations or variations in the HNF1A gene, which produces a transcription factor critical for the normal physiological development and regulation of multiple organ systems—most notably the pancreas, liver, and kidneys.
Key Pathologies and Manifestations.
MODY3 (Beta-Cell Dysfunction): Maturity-Onset Diabetes of the Young type-3 (MODY3) is a form of monogenic diabetes caused by heterozygous germline mutations in HNF1A. It leads to progressive pancreatic beta-cell dysfunction and a substantial drop in insulin’ secretion.
Hepatocellular Adenoma: The HNF1A protein acts as a metabolic regulator and a tumor suppressor in liver tissue. Inactivating mutations can result in the development of hepatocellular adenomas (benign liver tumors) or liver adenomatosis.
Glucosuria: HNF1A controls specific transporters responsible for reabsorbing sugar in the kidneys. When its function is impaired, the renal glucose threshold drops, causing glucose to bypass reabsorption and spill into the urine (glucosuria) even at normal or mildly elevated blood sugar levels.
