chr21-43774209-T-C
Position:
Variant summary
Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4
The NM_000100.4(CSTB):āc.290A>Gā(p.Tyr97Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000929 in 1,614,086 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (ā ).
Frequency
Genomes: š 0.0000066 ( 0 hom., cov: 33)
Exomes š: 0.0000096 ( 0 hom. )
Consequence
CSTB
NM_000100.4 missense
NM_000100.4 missense
Scores
2
5
11
Clinical Significance
Conservation
PhyloP100: 0.809
Genes affected
CSTB (HGNC:2482): (cystatin B) The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins and kininogens. This gene encodes a stefin that functions as an intracellular thiol protease inhibitor. The protein is able to form a dimer stabilized by noncovalent forces, inhibiting papain and cathepsins l, h and b. The protein is thought to play a role in protecting against the proteases leaking from lysosomes. Evidence indicates that mutations in this gene are responsible for the primary defects in patients with progressive myoclonic epilepsy (EPM1). One type of mutation responsible for EPM1 is the expansion in the promoter region of this gene of a CCCCGCCCCGCG repeat from 2-3 copies to 30-78 copies. [provided by RefSeq, Jul 2016]
Genome browser will be placed here
ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 1 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (MetaRNN=0.344696).
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CSTB | NM_000100.4 | c.290A>G | p.Tyr97Cys | missense_variant | 3/3 | ENST00000291568.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CSTB | ENST00000291568.7 | c.290A>G | p.Tyr97Cys | missense_variant | 3/3 | 1 | NM_000100.4 | P1 | |
CSTB | ENST00000639959.1 | c.158A>G | p.Tyr53Cys | missense_variant | 2/2 | 5 | |||
CSTB | ENST00000640406.1 | c.*365A>G | 3_prime_UTR_variant | 2/2 | 2 | ||||
CSTB | ENST00000675996.1 | n.715A>G | non_coding_transcript_exon_variant | 3/3 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152202Hom.: 0 Cov.: 33
GnomAD3 genomes
AF:
AC:
1
AN:
152202
Hom.:
Cov.:
33
Gnomad AFR
AF:
Gnomad AMI
AF:
Gnomad AMR
AF:
Gnomad ASJ
AF:
Gnomad EAS
AF:
Gnomad SAS
AF:
Gnomad FIN
AF:
Gnomad MID
AF:
Gnomad NFE
AF:
Gnomad OTH
AF:
GnomAD3 exomes AF: 0.0000199 AC: 5AN: 251474Hom.: 0 AF XY: 0.0000147 AC XY: 2AN XY: 135922
GnomAD3 exomes
AF:
AC:
5
AN:
251474
Hom.:
AF XY:
AC XY:
2
AN XY:
135922
Gnomad AFR exome
AF:
Gnomad AMR exome
AF:
Gnomad ASJ exome
AF:
Gnomad EAS exome
AF:
Gnomad SAS exome
AF:
Gnomad FIN exome
AF:
Gnomad NFE exome
AF:
Gnomad OTH exome
AF:
GnomAD4 exome AF: 0.00000958 AC: 14AN: 1461884Hom.: 0 Cov.: 31 AF XY: 0.0000110 AC XY: 8AN XY: 727248
GnomAD4 exome
AF:
AC:
14
AN:
1461884
Hom.:
Cov.:
31
AF XY:
AC XY:
8
AN XY:
727248
Gnomad4 AFR exome
AF:
Gnomad4 AMR exome
AF:
Gnomad4 ASJ exome
AF:
Gnomad4 EAS exome
AF:
Gnomad4 SAS exome
AF:
Gnomad4 FIN exome
AF:
Gnomad4 NFE exome
AF:
Gnomad4 OTH exome
AF:
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152202Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0AN XY: 74354
GnomAD4 genome
AF:
AC:
1
AN:
152202
Hom.:
Cov.:
33
AF XY:
AC XY:
0
AN XY:
74354
Gnomad4 AFR
AF:
Gnomad4 AMR
AF:
Gnomad4 ASJ
AF:
Gnomad4 EAS
AF:
Gnomad4 SAS
AF:
Gnomad4 FIN
AF:
Gnomad4 NFE
AF:
Gnomad4 OTH
AF:
Alfa
AF:
Hom.:
Bravo
AF:
Asia WGS
AF:
AC:
1
AN:
3478
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 | Dec 17, 2020 | This variant has not been reported in the literature in individuals with CSTB-related disease. 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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C55"). This variant is not present in population databases (ExAC no frequency). This sequence change replaces tyrosine with cysteine at codon 97 of the CSTB protein (p.Tyr97Cys). The tyrosine residue is highly conserved and there is a large physicochemical difference between tyrosine and cysteine. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Uncertain
CADD
Benign
DANN
Benign
DEOGEN2
Pathogenic
D
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Benign
D
LIST_S2
Benign
T
M_CAP
Benign
D
MetaRNN
Benign
T
MetaSVM
Benign
T
MutationTaster
Benign
D
PrimateAI
Uncertain
T
PROVEAN
Pathogenic
D
REVEL
Uncertain
Sift
Benign
D
Sift4G
Uncertain
D
Polyphen
B
Vest4
MutPred
Loss of phosphorylation at Y97 (P = 0.0553);
MVP
MPC
ClinPred
T
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
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