21-43056985-C-G

Variant names:

• chr21-43056985-C-G
• rs1005584
• NM_000071.3:c.1468-98G>C

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_000071.3(CBS):​c.1468-98G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 3)
  • Failed GnomAD Quality Control
• Consequence: CBS NM_000071.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.00
• Publications: 5 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: ClinGen, Genomics England PanelApp, Orphanet, Myriad Women's Health, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.99).

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.1468-98G>C		intron	N/A	NP_000062.1	P35520-1
	CBS	NM_001178008.3		c.1468-98G>C		intron	N/A	NP_001171479.1	P35520-1
	CBS	NM_001178009.3		c.1468-98G>C		intron	N/A	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.1468-98G>C		intron	N/A	ENSP00000381231.4	P35520-1
	CBS	ENST00000352178.9	TSL:1	c.1468-98G>C		intron	N/A	ENSP00000344460.5	P35520-1
	CBS	ENST00000359624.7	TSL:1	c.1468-98G>C		intron	N/A	ENSP00000352643.3	P35520-1

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 6138 Hom.: 0 Cov.: 3

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 6136 Hom.: 0 Cov.: 3 AF XY: 0.00 AC XY: 0 AN XY: 2896

African (AFR) AF: 0.00 AC: 0 AN: 682

American (AMR) AF: 0.00 AC: 0 AN: 1618

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 124

East Asian (EAS) AF: 0.00 AC: 0 AN: 524

South Asian (SAS) AF: 0.00 AC: 0 AN: 374

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 546

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 70

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 2032

Other (OTH) AF: 0.00 AC: 0 AN: 126

Alfa AF: 0.00 Hom.: 761

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.92
DANN	Benign	0.48
PhyloP100		-3.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs1005584;

hg19: chr21-44477095;