rs1222718209

Positions:

• chr8-99275215-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017890.5(VPS13B):​c.2785A>G​(p.Ile929Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,030 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: VPS13B NM_017890.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 0.307

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07986951).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
VPS13B	NM_017890.5	c.2785A>G	p.Ile929Val	missense_variant	19/62	ENST00000358544.7
VPS13B	NM_152564.5	c.2785A>G	p.Ile929Val	missense_variant	19/62	ENST00000357162.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
VPS13B	ENST00000358544.7	c.2785A>G	p.Ile929Val	missense_variant	19/62	1	NM_017890.5
VPS13B	ENST00000357162.7	c.2785A>G	p.Ile929Val	missense_variant	19/62	1	NM_152564.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461030 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726814

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: 0.0000375

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cohen syndrome Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Aug 06, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Sep 26, 2022	This sequence change replaces isoleucine with valine at codon 929 of the VPS13B protein (p.Ile929Val). The isoleucine residue is weakly conserved and there is a small physicochemical difference between isoleucine and valine. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This variant has not been reported in the literature in individuals affected with VPS13B-related conditions. ClinVar contains an entry for this variant (Variation ID: 459246). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt VPS13B protein function. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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, no assertion criteria provided	clinical testing	Natera, Inc.	Jul 27, 2020	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.060
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	1.5
DANN	Benign	0.87
DEOGEN2	Benign	0.059	.;T
Eigen	Benign	-0.50
Eigen_PC	Benign	-0.30
FATHMM_MKL	Benign	0.42	N
LIST_S2	Benign	0.74	T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.080	T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Benign	-0.20	N;N
MutationTaster	Benign	0.61	D;D;D
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-0.17	N;N
REVEL	Benign	0.048
Sift	Benign	0.46	T;T
Sift4G	Benign	0.61	T;T
Polyphen		0.0	B;B
Vest4		0.063
MutPred		0.24		Loss of helix (P = 0.079);Loss of helix (P = 0.079);
MVP		0.33
MPC		0.10
ClinPred		0.051	T
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.024
gMVP		0.23

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: rs1222718209; hg19: chr8-100287443; COSMIC: COSV100660636;