rs897601301
Positions:
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate
The NM_005670.4(EPM2A):c.848A>G(p.Tyr283Cys) variant causes a missense change. 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y283N) has been classified as Uncertain significance.
Frequency
Genomes: not found (cov: 33)
Consequence
EPM2A
NM_005670.4 missense
NM_005670.4 missense
Scores
5
12
1
Clinical Significance
Conservation
PhyloP100: 3.90
Genes affected
EPM2A (HGNC:3413): (EPM2A glucan phosphatase, laforin) This gene encodes a dual-specificity phosphatase and may be involved in the regulation of glycogen metabolism. The protein acts on complex carbohydrates to prevent glycogen hyperphosphorylation, thus avoiding the formation of insoluble aggregates. Loss-of-function mutations in this gene have been associated with Lafora disease, a rare, adult-onset recessive neurodegenerative disease, which results in myoclonus epilepsy and usually results in death several years after the onset of symptoms. The disease is characterized by the accumulation of insoluble particles called Lafora bodies, which are derived from glycogen. [provided by RefSeq, Jan 2018]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM1
?
In a domain Tyrosine-protein phosphatase (size 167) in uniprot entity EPM2A_HUMAN there are 22 pathogenic changes around while only 4 benign (85%) in NM_005670.4
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.903
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
EPM2A | NM_005670.4 | c.848A>G | p.Tyr283Cys | missense_variant | 4/4 | ENST00000367519.9 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
EPM2A | ENST00000367519.9 | c.848A>G | p.Tyr283Cys | missense_variant | 4/4 | 1 | NM_005670.4 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 33
GnomAD3 genomes
?
Cov.:
33
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 33
GnomAD4 genome
?
Cov.:
33
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Progressive myoclonic epilepsy Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Aug 30, 2021 | This sequence change replaces tyrosine with cysteine at codon 283 of the EPM2A protein (p.Tyr283Cys). The tyrosine residue is highly conserved and there is a large physicochemical difference between tyrosine and cysteine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with EPM2A-related conditions. ClinVar contains an entry for this variant (Variation ID: 411296). 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 disruptive. 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. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
CADD
Benign
DANN
Uncertain
DEOGEN2
Uncertain
D;.;.;.;.;.;.;.
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;.;D;.;.;.;.;D
M_CAP
Uncertain
D
MetaRNN
Pathogenic
D;D;D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;.;M;.;M;.;.;.
MutationTaster
Benign
D
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D;.;.;.;.;.;.;.
REVEL
Pathogenic
Sift
Uncertain
D;.;.;.;.;.;.;.
Sift4G
Uncertain
D;.;D;D;.;.;.;.
Polyphen
D;.;D;.;D;.;.;.
Vest4
MutPred
Loss of MoRF binding (P = 0.0809);.;Loss of MoRF binding (P = 0.0809);.;Loss of MoRF binding (P = 0.0809);.;.;.;
MVP
MPC
ClinPred
D
GERP RS
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at