20-58444170-C-G

Variant names:

• chr20-58444170-C-G
• NM_004738.5:c.667C>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_004738.5(VAPB):​c.667C>G​(p.Arg223Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: VAPB NM_004738.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.63

Genes affected

VAPB (HGNC:12649): (VAMP associated protein B and C) The protein encoded by this gene is a type IV membrane protein found in plasma and intracellular vesicle membranes. The encoded protein is found as a homodimer and as a heterodimer with VAPA. This protein also can interact with VAMP1 and VAMP2 and may be involved in vesicle trafficking. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.799

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VAPB	NM_004738.5	c.667C>G	p.Arg223Gly	missense_variant	Exon 6 of 6	ENST00000475243.6	NP_004729.1
VAPB	NM_001195677.2	c.*5C>G		3_prime_UTR_variant	Exon 3 of 3		NP_001182606.1
VAPB	NR_036633.2	n.713C>G		non_coding_transcript_exon_variant	Exon 4 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VAPB	ENST00000475243.6	c.667C>G	p.Arg223Gly	missense_variant	Exon 6 of 6	1	NM_004738.5	ENSP00000417175.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461894 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727248

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.30	T
Eigen	Uncertain	0.66
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.063	D
MetaRNN	Pathogenic	0.80	D
MetaSVM	Uncertain	-0.18	T
MutationAssessor	Uncertain	2.8	M
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.44
Sift	Benign	0.33	T
Sift4G	Benign	0.33	T
Polyphen		1.0	D
Vest4		0.78
MutPred		0.52		Loss of stability (P = 0.0264);
MVP		0.60
MPC		1.5
ClinPred		0.97	D
GERP RS		5.9
Varity_R		0.21
gMVP		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-57019226;