21-43056804-C-G

Position:

• chr21-43056804-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 0P and 0B.

The NM_000071.3(CBS):​c.1551G>C​(p.Gln517His) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 0)
• Consequence: CBS NM_000071.3 missense, splice_region
• Scores: Splicing: ADA: 0.0001960
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.543

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CBS	NM_000071.3	c.1551G>C	p.Gln517His	missense_variant, splice_region_variant	16/17	ENST00000398165.8	NP_000062.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CBS	ENST00000398165.8	c.1551G>C	p.Gln517His	missense_variant, splice_region_variant	16/17	1	NM_000071.3	ENSP00000381231	P1

Frequencies

GnomAD3 genomes Cov.: 0

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 0

ExAC AF: 0.0000114 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.63	D;D;D;D
Eigen	Benign	0.13
Eigen_PC	Benign	-0.0059
FATHMM_MKL	Benign	0.66	D
LIST_S2	Benign	0.83	.;.;.;T
M_CAP	Uncertain	0.20	D
MetaRNN	Uncertain	0.74	D;D;D;D
MetaSVM	Benign	-0.42	T
MutationAssessor	Pathogenic	3.0	M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-1.8	N;N;N;N
REVEL	Pathogenic	0.67
Sift	Benign	0.034	D;D;D;D
Sift4G	Benign	0.10	T;T;T;T
Polyphen		0.027	B;B;B;B
Vest4		0.83
MutPred		0.44		Loss of sheet (P = 0.0084);Loss of sheet (P = 0.0084);Loss of sheet (P = 0.0084);Loss of sheet (P = 0.0084);
MVP		0.87
MPC		0.40
ClinPred		0.94	D
GERP RS		2.9
Varity_R		0.12
gMVP		0.76

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00020
dbscSNV1_RF	Benign	0.098
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs750311684; hg19: chr21-44476914;