chr8-99642474-G-T

Position:

• chr8-99642474-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4 BP6

The NM_017890.5(VPS13B):​c.5959G>T​(p.Val1987Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000725 in 1,613,464 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1987A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00012 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000068 (0 hom.)
• Consequence: VPS13B NM_017890.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:3
• Conservation: PhyloP100: 7.80

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=0.26705134).
• BP6: Variant 8-99642474-G-T is Benign according to our data. Variant chr8-99642474-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 528838.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=2, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
VPS13B	NM_017890.5	c.5959G>T	p.Val1987Leu	missense_variant	34/62	ENST00000358544.7
VPS13B	NM_152564.5	c.5884G>T	p.Val1962Leu	missense_variant	34/62	ENST00000357162.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
VPS13B	ENST00000358544.7	c.5959G>T	p.Val1987Leu	missense_variant	34/62	1	NM_017890.5
VPS13B	ENST00000357162.7	c.5884G>T	p.Val1962Leu	missense_variant	34/62	1	NM_152564.5	P1

Frequencies

GnomAD3 genomes AF: 0.000118 AC: 18 AN: 152186 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000393

Gnomad ASJ AF: 0.00231

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000956

GnomAD3 exomes AF: 0.000136 AC: 34 AN: 250242 Hom.: 0 AF XY: 0.000118 AC XY: 16 AN XY: 135302

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000261

Gnomad ASJ exome AF: 0.00169

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000618

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.0000677 AC: 99 AN: 1461278 Hom.: 0 Cov.: 31 AF XY: 0.0000688 AC XY: 50 AN XY: 726950

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000381

Gnomad4 ASJ exome AF: 0.00203

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000117

Gnomad4 OTH exome AF: 0.000265

GnomAD4 genome AF: 0.000118 AC: 18 AN: 152186 Hom.: 0 Cov.: 32 AF XY: 0.0000942 AC XY: 7 AN XY: 74340

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000393

Gnomad4 ASJ AF: 0.00231

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.000956

Alfa AF: 0.000271 Hom.: 0

Bravo AF: 0.000140

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000233 AC: 2

ExAC AF: 0.0000989 AC: 12

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Department of Pathology and Laboratory Medicine, Sinai Health System	-	The VPS13B p.Val1987Leu variant was not identified in the literature nor was it identified in Cosmic or LOVD 3.0. The variant was identified in dbSNP (ID: rs375399419) and in ClinVar (classified as a VUS by Invitae for Cohen syndrome). The variant was also identified in control databases in 34 of 250242 chromosomes at a frequency of 0.000136 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: Ashkenazi Jewish in 17 of 10060 chromosomes (freq: 0.00169), Latino in 9 of 34420 chromosomes (freq: 0.000262), Other in 1 of 6094 chromosomes (freq: 0.000164) and European (non-Finnish) in 7 of 113206 chromosomes (freq: 0.000062); it was not observed in the African, East Asian, European (Finnish) and South Asian populations. The variant occurs outside of the splicing consensus sequence and 3 of 4 in silico or computational prediction software programs (SpliceSiteFinder, NNSPLICE, GeneSplicer) do not predict a difference in splicing. The p.Val1987 residue is conserved in mammals but not more distantly related organisms and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Oct 21, 2019	- -

Cohen syndrome Benign:2

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 11, 2019	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jun 12, 2018

- -

VPS13B-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 13, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	.;T
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.075	D
MetaRNN	Benign	0.27	T;T
MetaSVM	Benign	-0.43	T
MutationAssessor	Uncertain	2.1	.;M
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.0	N;N
REVEL	Uncertain	0.37
Sift	Uncertain	0.027	D;D
Sift4G	Benign	0.13	T;T
Polyphen		0.72	P;P
Vest4		0.75
MutPred		0.27		.;Loss of ubiquitination at K1992 (P = 0.0992);
MVP		0.55
MPC		0.45
ClinPred		0.096	T
GERP RS		5.2
Varity_R		0.20
gMVP		0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs375399419; hg19: chr8-100654702;