NM_001692.4:c.1298T>A

Variant names:

• chr2-70964785-T-A
• rs149910460
• NM_001692.4:c.1298T>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_001692.4(ATP6V1B1):​c.1298T>A​(p.Val433Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V433A) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: ATP6V1B1 NM_001692.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 7.99
• Publications: 0 publications found

Genes affected

ATP6V1B1 (HGNC:853): (ATPase H+ transporting V1 subunit B1) This gene encodes a component of vacuolar ATPase (V-ATPase), a multisubunit enzyme that mediates acidification of eukaryotic intracellular organelles. V-ATPase dependent organelle acidification is necessary for such intracellular processes as protein sorting, zymogen activation, receptor-mediated endocytosis, and synaptic vesicle proton gradient generation. V-ATPase is composed of a cytosolic V1 domain and a transmembrane V0 domain. The V1 domain consists of three A and three B subunits, two G subunits plus the C, D, E, F, and H subunits. The V1 domain contains the ATP catalytic site. The V0 domain consists of five different subunits: a, c, c', c'', and d. Additional isoforms of many of the V1 and V0 subunit proteins are encoded by multiple genes or alternatively spliced transcript variants. This encoded protein is one of two V1 domain B subunit isoforms and is found in the kidney. Mutations in this gene cause distal renal tubular acidosis associated with sensorineural deafness. [provided by RefSeq, Jul 2008]

ENSG00000258881 (HGNC:):

VAX2 (HGNC:12661): (ventral anterior homeobox 2) This gene encodes a homeobox protein and is almost exclusively expressed in the ventral portion of the retina during development. In mouse studies, this gene was found to be required for the correct formation of the optic fissure and other aspects of retinal development. [provided by RefSeq, Sep 2008]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.952

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001692.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ATP6V1B1	NM_001692.4	MANE Select	c.1298T>A	p.Val433Asp	missense	Exon 13 of 14	NP_001683.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ATP6V1B1	ENST00000234396.10	TSL:1 MANE Select	c.1298T>A	p.Val433Asp	missense	Exon 13 of 14	ENSP00000234396.4
	ENSG00000258881	ENST00000606025.5	TSL:5	c.476-22352A>T		intron	N/A	ENSP00000475641.1
	ATP6V1B1	ENST00000412314.5	TSL:5	c.1247T>A	p.Val416Asp	missense	Exon 13 of 14	ENSP00000388353.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Aug 27, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine with aspartic acid at codon 433 of the ATP6V1B1 protein (p.Val433Asp). The valine residue is highly conserved and there is a large physicochemical difference between valine and aspartic acid. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with ATP6V1B1-related conditions. ClinVar contains an entry for this variant (Variation ID: 624137). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C15"). 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.

Apr 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Renal tubular acidosis with progressive nerve deafness Uncertain:1

Oct 03, 2025

Rare Kidney Stone Consortium and the Mayo Clinic Hyperoxaluria Center, Mayo Clinic

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

ACMG:PM1, PM2, PP3

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	33
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.70	D
Eigen	Pathogenic	0.78
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.95	D
MetaSVM	Uncertain	0.60	D
MutationAssessor	Pathogenic	3.8	H
PhyloP100		8.0
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-5.1	D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.99	D
Vest4		0.94
MutPred		0.82		Gain of disorder (P = 0.0109)
MVP		0.99
MPC		1.2
ClinPred		1.0	D
GERP RS		3.9
Varity_R		0.84
gMVP		0.85
Mutation Taster		=21/79	disease causing

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

Other links and lift over

dbSNP: rs149910460; hg19: chr2-71191915;