Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.1.30.2 (endonuclease)
 18,621 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Autosomal dominant neurohypophyseal diabetes insipidus (ADNDI) is an inherited disease caused by progressive degeneration of the magnocellular neurons of the hypothalamus leading to decreased ability to produce the hormone arginine vasopressin (AVP). Affected individuals are not symptomatic at birth, but usually develop diabetes insipidus at 1-6 yr of age. The genetic locus of the disease is the AVP-neurophysin II (NPII) gene, and mutations that cause ADNDI have been found in both the signal peptide of the prepro-AVP-NPII precursor and within NPII itself. An affected girl who presented at 9 months of age and her similarly affected younger brother and father were all found to have a novel missense mutation (G1758-->T) encoding the amino acid substitution Gly23-->Val within NPII. The mutation was confirmed by restriction endonuclease analysis. A T1-weighted magnetic resonance imaging of the father's pituitary gland demonstrates an attenuated posterior pituitary bright spot. This mutation may be valuable for developing models of dominantly inherited neurodegeneration, as the early age of onset of symptoms suggests that this mutation may be particularly deleterious to the magnocellular neuron.
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PMID:Autosomal dominant neurohypophyseal diabetes insipidus associated with a missense mutation encoding Gly23-->Val in neurophysin II. 936 May 20

To determine the genetic basis of autosomal dominant neurohypophyseal diabetes insipidus (ADNDI) in a Cypriot family, we ascertained and studied a large, four-generation kindred in which all participating family members had arginine vasopressin-neurophysin II (AVP-NP-II) gene analyses done. A G to A transition was found by DNA sequence analysis at position 1773 (G1773A) of the AVP-NPII gene which is predicted to encode a substitution of tyrosine for cysteine in codon 59 (CYS59TYR). The mutation was confirmed by restriction endonuclease analysis of PCR amplification products that contain the corresponding segment of the AVP-NPII gene. To clarify the morphologic status of the pituitaries of family members, 12 affected and 3 nonaffected members had magnetic resonance imaging (MRI) studies. The bright spot of the posterior pituitary lobe was completely absent in 75% and faintly identified in 25% of the affected members who were examined with MRI. We conclude that (1) a novel G1773A transition in exon 2 of the AVP-NPII gene causes ADNDI in the large Cypriot kindred studied, (2) this mutation is predicted to encode a CYS59TYR substitution in NPII, and (3) MRI studies of the posterior pituitary lobes of affected family members show either a decreased intensity or a complete absence of the bright spot in all cases studied.
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PMID:A novel arginine vasopressin-neurophysin II mutation causes autosomal dominant neurohypophyseal diabetes insipidus and morphologic pituitary changes. 1115 Aug 85