ClinVar

Description

This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 160 of the GCK protein (p.Asp160Asn). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with maturity-onset diabetes of the young (PMID: 19790256, 25015100, 32533152, 33852230, 36257325). ClinVar contains an entry for this variant (Variation ID: 447404). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt GCK protein function with a negative predictive value of 80%. Experimental studies have shown that this missense change affects GCK function (PMID: 25015100). This variant disrupts the p.Asp160 amino acid residue in GCK. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 29056535, 30608898). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.