rs886062544

Positions:

• chr8-99784415-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_017890.5(VPS13B):​c.7955A>C​(p.Asn2652Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000123 in 1,461,454 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: VPS13B NM_017890.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 6.03

Genes affected

VPS13B (HGNC:2183): (vacuolar protein sorting 13 homolog B) This gene encodes a potential transmembrane protein that may function in vesicle-mediated transport and sorting of proteins within the cell. This protein may play a role in the development and the function of the eye, hematological system, and central nervous system. Mutations in this gene have been associated with Cohen syndrome. Multiple splice variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VPS13B	NM_017890.5	c.7955A>C	p.Asn2652Thr	missense_variant	43/62	ENST00000358544.7	NP_060360.3
VPS13B	NM_152564.5	c.7880A>C	p.Asn2627Thr	missense_variant	43/62	ENST00000357162.7	NP_689777.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VPS13B	ENST00000358544.7	c.7955A>C	p.Asn2652Thr	missense_variant	43/62	1	NM_017890.5	ENSP00000351346
VPS13B	ENST00000357162.7	c.7880A>C	p.Asn2627Thr	missense_variant	43/62	1	NM_152564.5	ENSP00000349685	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461454 Hom.: 0 Cov.: 31 AF XY: 0.0000110 AC XY: 8 AN XY: 727036

Gnomad4 AFR exome AF: 0.0000299

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: 0.0000153

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000546

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cohen syndrome Uncertain:3

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Aug 06, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 21, 2017	This sequence change replaces asparagine with threonine at codon 2652 of the VPS13B protein (p.Asn2652Thr). The asparagine residue is moderately conserved and there is a small physicochemical difference between asparagine and threonine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with VPS13B-related disease. ClinVar contains an entry for this variant (Variation ID: 361074). Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.67
BayesDel_addAF	Benign	0.0054	T
BayesDel_noAF	Benign	-0.23
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	.;T
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.93	D;D
M_CAP	Benign	0.042	D
MetaRNN	Uncertain	0.71	D;D
MetaSVM	Benign	-0.59	T
MutationAssessor	Benign	1.4	.;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.72	T
PROVEAN	Uncertain	-2.8	D;D
REVEL	Benign	0.24
Sift	Uncertain	0.0060	D;D
Sift4G	Uncertain	0.0070	D;D
Polyphen		1.0	D;D
Vest4		0.62
MutPred		0.26		.;Gain of helix (P = 0.0696);
MVP		0.82
MPC		0.42
ClinPred		0.97	D
GERP RS		5.5
Varity_R		0.44
gMVP		0.41

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: rs886062544; hg19: chr8-100796643;