7-140753354-T-C
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1PM2PM5PP2PP3_StrongPP5
The NM_004333.6(BRAF):c.1781A>G(p.Asp594Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D594V) has been classified as Pathogenic.
Frequency
Consequence
NM_004333.6 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 12 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
BRAF | ENST00000644969.2 | c.1901A>G | p.Asp634Gly | missense_variant | Exon 16 of 20 | NM_001374258.1 | ENSP00000496776.1 | |||
BRAF | ENST00000646891.2 | c.1781A>G | p.Asp594Gly | missense_variant | Exon 15 of 18 | NM_004333.6 | ENSP00000493543.1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD4 exome Cov.: 30
GnomAD4 genome Cov.: 32
ClinVar
Submissions by phenotype
Lung adenocarcinoma Pathogenic:1
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not provided Pathogenic:1
A BRAF c.1781A>G (p.Asp594Gly) variant was identified at an allelic fraction consistent with somatic origin. This variant has been reported in the ClinVar database as a variant of uncertain significance in a germline state by one submitter (ClinVar Variation ID: 13972) and it has been reported in numerous types of cancers in the cancer database COSMIC (Genomic Mutation ID: COSV56065695). This variant is absent from the general population (gnomAD v.4.1.0), indicating it is not a common variant. The BRAF c.1781A>G (p.Asp594Gly) variant occurs at a highly conserved residue within the CR3 activation segment, amino acids 594-627, of BRAF that is defined as a critical functional domain (Wellbrock C, et al., PMID: 15520807; Gelb BD, et al., PMID: 29493581). Computational predictors indicate that the variant is damaging, evidence that correlates with impact to BRAF function. In support of this prediction, functional studies show that this kinase-dead BRAF variant has a higher dimerization potential with CRAF as compared with WT BRAF and it has the ability to bypass autoinhibitory autophosphorylation which results in a sustained mitogen-activated protein kinase (MAPK) signaling (Cope NJ et al., PMID: 31929109). The BRAF gene is defined by the ClinGen RASopathy expert panel as a gene that has a low rate of benign missense variation and where pathogenic missense variants are a common mechanism of disease (Gelb BD, et al., PMID: 29493581). Other variants in the same codon, c.1782T>G (p.Asp594Glu) and c.1781A>T (p.Asp594Val), have been reported and are considered pathogenic (including by an expert panel), likely pathogenic, or uncertain significance (ClinVar IDs: 375946, 375944). Based on available information and an internally developed protocol informed by the ACMG/AMP guidelines for variant interpretation and gene-specific practices from the ClinGen Criteria Specification Registry (Leon-Quintero FZ et al., PMID: 39434542), the BRAF c.1781A>G (p.Asp594Gly) variant is classified as pathogenic. -
Non-small cell lung carcinoma Pathogenic:1
This variant has been reported as a somatic change in large intestine, skin, end ometrium, stomach, and ovary (COSMIC, Fransen 2004) and has been observed in up to 11% of BRAF mutant positive lung adenocarcinoma (Paik 2011). -
Non-Hodgkin lymphoma Pathogenic:1
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RASopathy Uncertain:1
This sequence change replaces aspartic acid with glycine at codon 594 of the BRAF protein (p.Asp594Gly). The aspartic acid residue is highly conserved and there is a moderate physicochemical difference between aspartic acid and glycine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with BRAF-related conditions. ClinVar contains an entry for this variant (Variation ID: 13972). 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 expected to disrupt BRAF protein function. Experimental studies have shown that this variant affects BRAF function (PMID: 23352452, 29595366). 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. -
Neoplasm Other:1
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Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at