17-42466455-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The NM_001130021.3(ATP6V0A1):c.144A>C(p.Gln48His) variant causes a missense change involving the alteration of a non-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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATP6V0A1 NM_001130021.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.942

Genes affected

ATP6V0A1 (HGNC:865): (ATPase H+ transporting V0 subunit a1) 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 gene encodes one of three A subunit proteins and the encoded protein is associated with clathrin-coated vesicles. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, ATP6V0A1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.767

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATP6V0A1	NM_001130021.3	c.144A>C	p.Gln48His	missense_variant	3/22	ENST00000343619.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATP6V0A1	ENST00000343619.9	c.144A>C	p.Gln48His	missense_variant	3/22	1	NM_001130021.3	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 16, 2024

Variant summary: ATP6V0A1 c.144A>C (p.Gln48His) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251382 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.144A>C in individuals affected with ATP6V0A1-Related Disorders and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Benign	-0.090
Cadd	Benign	20
Dann	Uncertain	0.98
Eigen	Benign	-0.052
Eigen_PC	Benign	-0.028
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.94	D;D;D;D;D;D;D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.77	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Pathogenic	3.3	M;.;M;.;M;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-4.5	D;D;D;.;D;.;.
REVEL	Uncertain	0.58
Sift	Uncertain	0.0030	D;D;D;.;D;.;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D
Polyphen		0.096	B;B;.;B;B;.;.
Vest4		0.16
MutPred		0.81		Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);Loss of MoRF binding (P = 0.1036);
MVP		0.50
MPC		0.82
ClinPred		0.87	D
GERP RS		2.2
Varity_R		0.75
gMVP		0.84

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: rs112804782; hg19: chr17-40618473;