rs201221998
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Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3
The NM_020686.6(ABAT):c.964G>A(p.Ala322Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,892 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 Uncertain significance (★).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000014 ( 0 hom. )
Consequence
ABAT
NM_020686.6 missense
NM_020686.6 missense
Scores
7
8
3
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 Uncertain_significance. Variant got 3 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.757
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ABAT | NM_020686.6 | c.964G>A | p.Ala322Thr | missense_variant | 13/16 | ENST00000268251.13 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ABAT | ENST00000268251.13 | c.964G>A | p.Ala322Thr | missense_variant | 13/16 | 1 | NM_020686.6 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000657 AC: 1AN: 152126Hom.: 0 Cov.: 32
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GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461766Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2AN XY: 727196
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GnomAD4 genome ? AF: 0.00000657 AC: 1AN: 152126Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74310
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Gamma-aminobutyric acid transaminase deficiency Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Aug 15, 2017 | 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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with ABAT-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with threonine at codon 322 of the ABAT protein (p.Ala322Thr). The alanine residue is moderately conserved and there is a small physicochemical difference between alanine and threonine. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
CADD
Pathogenic
DANN
Pathogenic
DEOGEN2
Uncertain
D;D;.;D;D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
M_CAP
Uncertain
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
Uncertain
D;D;D;D;D
REVEL
Pathogenic
Sift
Benign
T;T;T;T;T
Sift4G
Benign
T;T;T;T;T
Polyphen
D;D;.;D;.
Vest4
MutPred
Loss of catalytic residue at A322 (P = 0.0223);Loss of catalytic residue at A322 (P = 0.0223);.;Loss of catalytic residue at A322 (P = 0.0223);Loss of catalytic residue at A322 (P = 0.0223);
MVP
MPC
0.44
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
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