8-99848776-G-T

Variant names:

• chr8-99848776-G-T
• rs116746734
• NM_017890.5:c.10018G>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_152564.5(VPS13B):​c.9943G>T​(p.Val3315Phe) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: VPS13B NM_152564.5 missense, splice_region
• Scores: Splicing: ADA: 0.9998
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 4.68

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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
VPS13B	NM_017890.5	c.10018G>T	p.Val3340Phe	missense_variant, splice_region_variant	Exon 55 of 62	ENST00000358544.7	NP_060360.3
VPS13B	NM_152564.5	c.9943G>T	p.Val3315Phe	missense_variant, splice_region_variant	Exon 55 of 62	ENST00000357162.7	NP_689777.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
VPS13B	ENST00000358544.7	c.10018G>T	p.Val3340Phe	missense_variant, splice_region_variant	Exon 55 of 62	1	NM_017890.5	ENSP00000351346.2
VPS13B	ENST00000357162.7	c.9943G>T	p.Val3315Phe	missense_variant, splice_region_variant	Exon 55 of 62	1	NM_152564.5	ENSP00000349685.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

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:2

Jun 14, 2016

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 04, 2018

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

May 19, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Uncertain	0.082	D
BayesDel_noAF	Benign	-0.12
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Benign	0.062	.;T
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.068	D
MetaRNN	Benign	0.34	T;T
MetaSVM	Benign	-0.52	T
MutationAssessor	Uncertain	2.4	.;M
PrimateAI	Benign	0.47	T
PROVEAN	Benign	0.26	N;N
REVEL	Benign	0.15
Sift	Benign	0.25	T;T
Sift4G	Uncertain	0.014	D;D
Polyphen		0.37	B;D
Vest4		0.52
MutPred		0.29		.;Loss of sheet (P = 0.1501);
MVP		0.84
MPC		0.32
ClinPred		0.91	D
GERP RS		5.5
Varity_R		0.23
gMVP		0.59

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.52		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.52		Position offset: -22

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

Publications

LitVar

Other links and lift over

dbSNP: rs116746734; hg19: chr8-100861004;