chr2-70936031-T-G

Variant names:

• chr2-70936031-T-G
• rs527738649
• NM_001692.4:c.77T>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001692.4(ATP6V1B1):​c.77T>G​(p.Met26Arg) 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 1,461,730 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. M26V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ATP6V1B1 NM_001692.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.879
• 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]

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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.104073256).

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.77T>G	p.Met26Arg	missense	Exon 1 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.77T>G	p.Met26Arg	missense	Exon 1 of 14	ENSP00000234396.4
	ATP6V1B1	ENST00000412314.5	TSL:5	c.77T>G	p.Met26Arg	missense	Exon 1 of 14	ENSP00000388353.1
	ATP6V1B1	ENST00000454446.6	TSL:5	c.77T>G	p.Met26Arg	missense	Exon 1 of 9	ENSP00000408361.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461730 Hom.: 0 Cov.: 38 AF XY: 0.00 AC XY: 0 AN XY: 727178

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53386

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111932

Other (OTH) AF: 0.00 AC: 0 AN: 60382

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.042	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	16
DANN	Benign	0.93
DEOGEN2	Benign	0.24	T
Eigen	Benign	-0.88
Eigen_PC	Benign	-0.81
FATHMM_MKL	Benign	0.23	N
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.69	N
PhyloP100		0.88
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.21
Sift	Benign	0.095	T
Sift4G	Benign	0.42	T
Polyphen		0.0	B
Vest4		0.28
MutPred		0.62		Gain of catalytic residue at M26 (P = 0.0384)
MVP		0.71
MPC		0.46
ClinPred		0.040	T
GERP RS		1.1
PromoterAI		0.054	Neutral
Varity_R		0.27
gMVP		0.53
Mutation Taster		=97/3	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs527738649; hg19: chr2-71163161;