rs193922273
Variant summary
Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PP2PP3PM2_SupportingPM5
This summary comes from the ClinGen Evidence Repository: The c.1268T>C variant in the glucokinase gene, GCK, causes an amino acid change of phenylalanine to serine at codon 423 (p.(Phe423Ser)) of NM_000162.5. GCK is defined by the ClinGen MDEP as a gene that has a low rate of benign missense variation and has pathogenic missense variants as a common mechanism of disease (PP2). This variant is predicted to be deleterious by computational evidence, with a REVEL score of 0.973, which is greater than the MDEP VCEP threshold of 0.70 (PP3). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). Another missense variant, c.1268T>A, p.Phe423Tyr has been interpreted as pathogenic by the ClinGen MDEP, and p.Phe423Ser has a greater Grantham distance (PM5). This variant was identified in an individual with a phenotype suggestive of GCK-hyperglycemia; however, PP4 is unable to be evaluated due to insufficient clinical information (PMIDs: 25555642, internal lab contributors). This variant was identified in two unrelated individuals with hyperglycemia; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMID:25555642, internal lab contributors). In summary, c.1268T>C meets the criteria to be classified as a variant of uncertain significance for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 1.3.0, approved 8/11/2023): PM2_supporting, PP2, PP3, PM5. LINK:https://erepo.genome.network/evrepo/ui/classification/CA367397256/MONDO:0015967/086
Frequency
Consequence
NM_000162.5 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 5 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
GCK | NM_000162.5 | c.1268T>C | p.Phe423Ser | missense_variant | 10/10 | ENST00000403799.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
GCK | ENST00000403799.8 | c.1268T>C | p.Phe423Ser | missense_variant | 10/10 | 1 | NM_000162.5 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD4 exome Cov.: 31
GnomAD4 genome ? Cov.: 33
ClinVar
Submissions by phenotype
not specified Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Athena Diagnostics | Jan 09, 2017 | - - |
Monogenic diabetes Uncertain:1
Uncertain significance, reviewed by expert panel | curation | ClinGen Monogenic Diabetes Variant Curation Expert Panel | Apr 27, 2024 | The c.1268T>C variant in the glucokinase gene, GCK, causes an amino acid change of phenylalanine to serine at codon 423 (p.(Phe423Ser)) of NM_000162.5. GCK is defined by the ClinGen MDEP as a gene that has a low rate of benign missense variation and has pathogenic missense variants as a common mechanism of disease (PP2). This variant is predicted to be deleterious by computational evidence, with a REVEL score of 0.973, which is greater than the MDEP VCEP threshold of 0.70 (PP3). This variant is absent from gnomAD v2.1.1 (PM2_Supporting). Another missense variant, c.1268T>A, p.Phe423Tyr has been interpreted as pathogenic by the ClinGen MDEP, and p.Phe423Ser has a greater Grantham distance (PM5). This variant was identified in an individual with a phenotype suggestive of GCK-hyperglycemia; however, PP4 is unable to be evaluated due to insufficient clinical information (PMIDs: 25555642, internal lab contributors). This variant was identified in two unrelated individuals with hyperglycemia; however, PS4_Moderate cannot be applied because this number is below the ClinGen MDEP threshold (PMID: 25555642, internal lab contributors). In summary, c.1268T>C meets the criteria to be classified as a variant of uncertain significance for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 1.3.0, approved 8/11/2023): PM2_supporting, PP2, PP3, PM5. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at