rs121964967
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1PM5PP3_StrongPP5_Moderate
The NM_000071.3(CBS):c.1150A>G(p.Lys384Glu) variant causes a missense change involving the alteration of a conserved nucleotide. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K384N) has been classified as Pathogenic.
Frequency
Genomes: not found (cov: 0)
Consequence
CBS
NM_000071.3 missense
NM_000071.3 missense
Scores
9
9
1
Clinical Significance
Conservation
PhyloP100: 7.60
Genes affected
CBS (HGNC:1550): (cystathionine beta-synthase) The protein encoded by this gene acts as a homotetramer to catalyze the conversion of homocysteine to cystathionine, the first step in the transsulfuration pathway. The encoded protein is allosterically activated by adenosyl-methionine and uses pyridoxal phosphate as a cofactor. Defects in this gene can cause cystathionine beta-synthase deficiency (CBSD), which can lead to homocystinuria. This gene is a major contributor to cellular hydrogen sulfide production. Multiple alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Feb 2016]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 10 ACMG points.
PM1
In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_000071.3
PM5
Other missense variant is known to change same aminoacid residue: Variant chr21-43059297-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 813502.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.992
PP5
Variant 21-43059299-T-C is Pathogenic according to our data. Variant chr21-43059299-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 123.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr21-43059299-T-C is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CBS | NM_000071.3 | c.1150A>G | p.Lys384Glu | missense_variant | 13/17 | ENST00000398165.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CBS | ENST00000398165.8 | c.1150A>G | p.Lys384Glu | missense_variant | 13/17 | 1 | NM_000071.3 | P1 |
Frequencies
GnomAD3 genomes Cov.: 0
GnomAD3 genomes
Cov.:
0
GnomAD4 exome Cov.: 0
GnomAD4 exome
Cov.:
0
GnomAD4 genome Cov.: 0
GnomAD4 genome
Cov.:
0
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Homocystinuria, pyridoxine-responsive Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Jan 01, 1997 | - - |
HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Oct 11, 2023 | This sequence change replaces lysine, which is basic and polar, with glutamic acid, which is acidic and polar, at codon 384 of the CBS protein (p.Lys384Glu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with homocystinuria (PMID: 8990018). ClinVar contains an entry for this variant (Variation ID: 123). 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 expected to disrupt CBS protein function. 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
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
DEOGEN2
Pathogenic
D;D;D;D
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
.;.;.;D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D
MetaSVM
Pathogenic
D
MutationAssessor
Pathogenic
H;H;H;H
MutationTaster
Benign
A;A;A;A;A;A;A;A;A;A;A;A
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D;D;D
REVEL
Pathogenic
Sift
Uncertain
D;D;D;D
Sift4G
Uncertain
D;D;D;D
Polyphen
D;D;D;D
Vest4
MutPred
Loss of MoRF binding (P = 0.0022);Loss of MoRF binding (P = 0.0022);Loss of MoRF binding (P = 0.0022);Loss of MoRF binding (P = 0.0022);
MVP
MPC
1.3
ClinPred
D
GERP RS
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