rs142313595

Variant names:

• chr21-43065444-G-A
• rs142313595
• NM_000071.3:c.609C>T

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_Strong BP6_Very_Strong BP7

The NM_000071.3(CBS):​c.609C>T​(p.His203His) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 5)
  • Exomes 𝑓: 0.0000023 (0 hom.)
• Consequence: CBS NM_000071.3 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -1.75
• Publications: 0 publications found

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]

CBS Gene-Disease associations (from GenCC):

• classic homocystinuria

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet, Myriad Women’s Health, Genomics England PanelApp

ACMG classification

Our verdict: Benign. The variant received -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.53).
• BP6: Variant 21-43065444-G-A is Benign according to our data. Variant chr21-43065444-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 264194.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-1.75 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000071.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CBS	NM_000071.3	MANE Select	c.609C>T	p.His203His	synonymous	Exon 7 of 17	NP_000062.1	P35520-1
	CBS	NM_001178008.3		c.609C>T	p.His203His	synonymous	Exon 7 of 17	NP_001171479.1	P35520-1
	CBS	NM_001178009.3		c.609C>T	p.His203His	synonymous	Exon 7 of 18	NP_001171480.1	P35520-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CBS	ENST00000398165.8	TSL:1 MANE Select	c.609C>T	p.His203His	synonymous	Exon 7 of 17	ENSP00000381231.4	P35520-1
	CBS	ENST00000352178.9	TSL:1	c.609C>T	p.His203His	synonymous	Exon 7 of 17	ENSP00000344460.5	P35520-1
	CBS	ENST00000359624.7	TSL:1	c.609C>T	p.His203His	synonymous	Exon 7 of 18	ENSP00000352643.3	P35520-1

Frequencies

GnomAD3 genomes Cov.: 5

GnomAD2 exomes AF: 0.0000320 AC: 8 AN: 249752 AF XY: 0.0000296

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000623

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.00000230 AC: 1 AN: 434930 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 231808

African (AFR) AF: 0.00 AC: 0 AN: 13596

American (AMR) AF: 0.00 AC: 0 AN: 30440

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14474

East Asian (EAS) AF: 0.00 AC: 0 AN: 31328

South Asian (SAS) AF: 0.00 AC: 0 AN: 52938

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 27594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1882

European-Non Finnish (NFE) AF: 0.00000420 AC: 1 AN: 238292

Other (OTH) AF: 0.00 AC: 0 AN: 24386

GnomAD4 genome Cov.: 5

Alfa AF: 0.0000468 Hom.: 0

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Familial thoracic aortic aneurysm and aortic dissection (1)
-	-	1	HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.53
CADD	Benign	1.7
DANN	Benign	0.46
PhyloP100		-1.8

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs142313595; hg19: chr21-44485554;