rs140179844

Positions:

• chr8-99778960-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_152564.5(VPS13B):​c.7708G>A​(p.Asp2570Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000221 in 1,613,910 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0011 (2 hom., cov: 32)
  • Exomes 𝑓: 0.00013 (0 hom.)
• Consequence: VPS13B NM_152564.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:3 B:7
• Conservation: PhyloP100: 8.94

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]

VPS13B (HGNC:):

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.00878191).
• BP6: Variant 8-99778960-G-A is Benign according to our data. Variant chr8-99778960-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 95868.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=3, Likely_pathogenic=1}.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VPS13B	NM_017890.5	c.7783G>A	p.Asp2595Asn	missense_variant	42/62	ENST00000358544.7	NP_060360.3
VPS13B	NM_152564.5	c.7708G>A	p.Asp2570Asn	missense_variant	42/62	ENST00000357162.7	NP_689777.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VPS13B	ENST00000358544.7	c.7783G>A	p.Asp2595Asn	missense_variant	42/62	1	NM_017890.5	ENSP00000351346.2
VPS13B	ENST00000357162.7	c.7708G>A	p.Asp2570Asn	missense_variant	42/62	1	NM_152564.5	ENSP00000349685.2

Frequencies

GnomAD3 genomes AF: 0.00106 AC: 162 AN: 152178 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00345

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00191

GnomAD3 exomes AF: 0.000395 AC: 99 AN: 250724 Hom.: 0 AF XY: 0.000273 AC XY: 37 AN XY: 135518

Gnomad AFR exome AF: 0.00504

Gnomad AMR exome AF: 0.000376

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.000164

GnomAD4 exome AF: 0.000129 AC: 188 AN: 1461614 Hom.: 0 Cov.: 31 AF XY: 0.000102 AC XY: 74 AN XY: 727126

Gnomad4 AFR exome AF: 0.00424

Gnomad4 AMR exome AF: 0.000380

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000989

Gnomad4 OTH exome AF: 0.000265

GnomAD4 genome AF: 0.00111 AC: 169 AN: 152296 Hom.: 2 Cov.: 32 AF XY: 0.00101 AC XY: 75 AN XY: 74468

Gnomad4 AFR AF: 0.00361

Gnomad4 AMR AF: 0.000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.000307 Hom.: 1

Bravo AF: 0.00146

ESP6500AA AF: 0.00363 AC: 16

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.000469 AC: 57

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:3 Benign:7

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Cohen syndrome Pathogenic:1 Uncertain:1 Benign:3

Likely pathogenic, flagged submission	clinical testing	Biochemical Molecular Genetic Laboratory, King Abdulaziz Medical City	Sep 26, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Dec 28, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 07, 2020	- -

not specified Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Sep 26, 2016	The D2595N variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The NHLBI Exome Sequencing Project reports D2595N was observed in 16 of 4406 (0.36%) alleles from individuals of African American background, and the 1000 Genomes Project Consortium reports it was observed in 5 of 198 (2.53%) alleles in an African sub-population. The D2595N variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position that is conserved in mammals and in silico analysis predicts this variant is probably damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is pathogenic or a rare benign variant. -
Likely benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 10, 2024	Variant summary: VPS13B c.7783G>A (p.Asp2595Asn) results in a conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00039 in 250724 control chromosomes, predominantly at a frequency of 0.005 within the African or African-American subpopulation in the gnomAD database. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 2 fold of the estimated maximal expected allele frequency for a pathogenic variant in VPS13B causing Cohen Syndrome phenotype (0.0025). To our knowledge, no experimental evidence demonstrating its impact on protein function has been reported. ClinVar contains an entry for this variant (Variation ID: 95868). Based on the evidence outlined above, the variant was classified as likely benign. -

not provided Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2024	VPS13B: BS2 -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Aug 28, 2013	- -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 24, 2018

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

VPS13B-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 25, 2020

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	Benign	0.13
BayesDel_addAF	Benign	-0.40	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.41	.;T
Eigen	Uncertain	0.33
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.87	D;D
M_CAP	Benign	0.048	D
MetaRNN	Benign	0.0088	T;T
MetaSVM	Benign	-0.44	T
MutationAssessor	Uncertain	2.3	.;M
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-2.7	D;D
REVEL	Uncertain	0.41
Sift	Benign	0.32	T;T
Sift4G	Uncertain	0.0030	D;D
Polyphen		0.74	P;P
Vest4		0.47
MVP		0.80
MPC		0.32
ClinPred		0.049	T
GERP RS		5.6
Varity_R		0.15
gMVP		0.56

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: rs140179844; hg19: chr8-100791188;