rs724159992
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Variant summary
Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong
The NM_020686.6(ABAT):c.275G>A(p.Arg92Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000372 in 1,614,020 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).
Frequency
Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000027 ( 0 hom. )
Consequence
ABAT
NM_020686.6 missense
NM_020686.6 missense
Scores
8
3
7
Clinical Significance
Conservation
PhyloP100: 9.96
Genes affected
ABAT (HGNC:23): (4-aminobutyrate aminotransferase) 4-aminobutyrate aminotransferase (ABAT) is responsible for catabolism of gamma-aminobutyric acid (GABA), an important, mostly inhibitory neurotransmitter in the central nervous system, into succinic semialdehyde. The active enzyme is a homodimer of 50-kD subunits complexed to pyridoxal-5-phosphate. The protein sequence is over 95% similar to the pig protein. GABA is estimated to be present in nearly one-third of human synapses. ABAT in liver and brain is controlled by 2 codominant alleles with a frequency in a Caucasian population of 0.56 and 0.44. The ABAT deficiency phenotype includes psychomotor retardation, hypotonia, hyperreflexia, lethargy, refractory seizures, and EEG abnormalities. Multiple alternatively spliced transcript variants encoding the same protein isoform have been found for this gene. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 14 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.956
PP5
?
Variant 16-8750498-G-A is Pathogenic according to our data. Variant chr16-8750498-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 162036.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr16-8750498-G-A is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ABAT | NM_020686.6 | c.275G>A | p.Arg92Gln | missense_variant | 5/16 | ENST00000268251.13 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ABAT | ENST00000268251.13 | c.275G>A | p.Arg92Gln | missense_variant | 5/16 | 1 | NM_020686.6 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000131 AC: 2AN: 152190Hom.: 0 Cov.: 32
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GnomAD4 exome AF: 0.00000274 AC: 4AN: 1461830Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3AN XY: 727212
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GnomAD4 genome ? AF: 0.0000131 AC: 2AN: 152190Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2AN XY: 74348
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ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Gamma-aminobutyric acid transaminase deficiency Pathogenic:4
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Sep 07, 2023 | - - |
Pathogenic, no assertion criteria provided | literature only | OMIM | Feb 01, 2010 | - - |
Pathogenic, criteria provided, single submitter | research | Bonnen Lab, Baylor College of Medicine | Jan 01, 2014 | clinical and in vitro studies - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 01, 2023 | This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 92 of the ABAT protein (p.Arg92Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with GABA transaminase deficiency (PMID: 20052547, 30617166). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 162036). 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 ABAT protein function with a negative predictive value of 80%. 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. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Pathogenic
DEOGEN2
Benign
T;T;.;T;T
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
M_CAP
Benign
D
MetaRNN
Pathogenic
D;D;D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;M;.;M;.
MutationTaster
Benign
D;D;D;D;D
PrimateAI
Uncertain
T
PROVEAN
Benign
N;N;N;N;N
REVEL
Pathogenic
Sift
Benign
T;T;T;T;T
Sift4G
Benign
T;T;T;T;T
Polyphen
D;D;.;D;.
Vest4
MutPred
Gain of phosphorylation at Y97 (P = 0.2414);Gain of phosphorylation at Y97 (P = 0.2414);.;Gain of phosphorylation at Y97 (P = 0.2414);Gain of phosphorylation at Y97 (P = 0.2414);
MVP
MPC
0.47
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at