8-99193015-G-T

Variant names:

• chr8-99193015-G-T
• rs148788159
• NM_017890.5:c.2473G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_152564.5(VPS13B):​c.2473G>T​(p.Ala825Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,426 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A825V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: VPS13B NM_152564.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.11
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Cohen syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Myriad Women’s Health, Laboratory for Molecular Medicine, Orphanet, Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.04542461).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152564.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	VPS13B	NM_017890.5	MANE Plus Clinical	c.2473G>T	p.Ala825Ser	missense	Exon 17 of 62	NP_060360.3
	VPS13B	NM_152564.5	MANE Select	c.2473G>T	p.Ala825Ser	missense	Exon 17 of 62	NP_689777.3
	VPS13B	NM_015243.3		c.2473G>T	p.Ala825Ser	missense	Exon 17 of 18	NP_056058.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	VPS13B	ENST00000358544.7	TSL:1 MANE Plus Clinical	c.2473G>T	p.Ala825Ser	missense	Exon 17 of 62	ENSP00000351346.2	Q7Z7G8-1
	VPS13B	ENST00000357162.7	TSL:1 MANE Select	c.2473G>T	p.Ala825Ser	missense	Exon 17 of 62	ENSP00000349685.2	Q7Z7G8-2
	VPS13B	ENST00000355155.6	TSL:1	n.2473G>T		non_coding_transcript_exon	Exon 17 of 28	ENSP00000347281.2	A0A8C8KE22

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461426 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727016

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33466

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39612

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86246

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53300

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111822

Other (OTH) AF: 0.00 AC: 0 AN: 60376

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.087
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	1.7
DANN	Benign	0.16
DEOGEN2	Benign	0.045	T
Eigen	Benign	-0.99
Eigen_PC	Benign	-0.93
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.68	T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.045	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N
PhyloP100		1.1
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.080	N
REVEL	Benign	0.049
Sift	Benign	0.73	T
Sift4G	Benign	0.84	T
Polyphen		0.0	B
Vest4		0.13
MutPred		0.42		Gain of disorder (P = 0.0267)
MVP		0.45
MPC		0.15
ClinPred		0.014	T
GERP RS		0.83
Varity_R		0.031
gMVP		0.23
Mutation Taster		=94/6	polymorphism

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

Other links and lift over

dbSNP: rs148788159; hg19: chr8-100205243;