16-56192293-G-A
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP2PP3_ModeratePP5
The NM_020988.3(GNAO1):c.58G>A(p.Glu20Lys) 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).
Frequency
Consequence
NM_020988.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
GNAO1 | NM_020988.3 | c.58G>A | p.Glu20Lys | missense_variant | Exon 1 of 9 | ENST00000262493.12 | NP_066268.1 | |
GNAO1 | NM_138736.3 | c.58G>A | p.Glu20Lys | missense_variant | Exon 1 of 8 | NP_620073.2 | ||
GNAO1 | XR_007064866.1 | n.805G>A | non_coding_transcript_exon_variant | Exon 1 of 9 |
Ensembl
Frequencies
GnomAD3 genomes Cov.: 31
GnomAD4 exome Cov.: 29
GnomAD4 genome Cov.: 31
ClinVar
Submissions by phenotype
Early infantile epileptic encephalopathy with suppression bursts Pathogenic:1
In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 946388). This missense change has been observed in individual(s) with clinical features of GNAO1-related conditions (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 20 of the GNAO1 protein (p.Glu20Lys). -
Inborn genetic diseases Uncertain:1
The c.58G>A (p.E20K) alteration is located in exon 1 (coding exon 1) of the GNAO1 gene. This alteration results from a G to A substitution at nucleotide position 58, causing the glutamic acid (E) at amino acid position 20 to be replaced by a lysine (K). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This amino acid position is well conserved in available vertebrate species. This missense alteration is located in a region that has a low rate of benign missense variation (Lek, 2016; Firth, 2009). The in silico prediction for this alteration is inconclusive. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at