rs281875284

Positions:

• chr20-58418289-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_004738.5(VAPB):​c.137C>T​(p.Thr46Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: VAPB NM_004738.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 7.91

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 Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.955
• PP5: Variant 20-58418289-C-T is Pathogenic according to our data. Variant chr20-58418289-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 30510.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr20-58418289-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VAPB	NM_004738.5	c.137C>T	p.Thr46Ile	missense_variant	2/6	ENST00000475243.6	NP_004729.1
VAPB	NM_001195677.2	c.137C>T	p.Thr46Ile	missense_variant	2/3		NP_001182606.1
VAPB	NR_036633.2	n.368C>T		non_coding_transcript_exon_variant	2/4
VAPB	XR_001754433.3	n.368C>T		non_coding_transcript_exon_variant	2/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VAPB	ENST00000475243.6	c.137C>T	p.Thr46Ile	missense_variant	2/6	1	NM_004738.5	ENSP00000417175	P1
VAPB	ENST00000395802.7	c.137C>T	p.Thr46Ile	missense_variant	2/3	1		ENSP00000379147
VAPB	ENST00000265619.6	n.435C>T		non_coding_transcript_exon_variant	3/6	2
VAPB	ENST00000520497.1	c.137C>T	p.Thr46Ile	missense_variant, NMD_transcript_variant	2/4	2		ENSP00000430426

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727246

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1 Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Amyotrophic lateral sclerosis type 8 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Dec 17, 2010

- -

not provided Other:1

not provided, no classification provided

literature only

UniProtKB/Swiss-Prot

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.39
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.92	D;.
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.96	D;D
MetaSVM	Uncertain	0.76	D
MutationAssessor	Pathogenic	4.3	H;H
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.91	D
PROVEAN	Pathogenic	-5.9	D;D
REVEL	Pathogenic	0.78
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0010	D;D
Polyphen		1.0	D;D
Vest4		0.99
MutPred		0.83		Loss of glycosylation at T46 (P = 0.0393);Loss of glycosylation at T46 (P = 0.0393);
MVP		0.97
MPC		1.4
ClinPred		1.0	D
GERP RS		6.2
Varity_R		0.93
gMVP		0.86

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

LitVar

Other links and lift over

dbSNP: rs281875284; hg19: chr20-56993345;