ATP1A3 p.Arg756His

Variant names:

• chr19-41970539-C-T
• rs606231435
• NM_152296.5:c.2267G>A
• ATP1A3 p.Arg756His

Your query was ambiguous. Multiple possible variants found:

• chr19-41970539-C-T
• chr19-41970538-GC-AT

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+5 Uncertain · Hot

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 5 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_ModerateO6_SupportingO7_SupportingO8_Supporting

The NM_152296.5(ATP1A3):c.2267G>A (p.Arg756His) variant causes a missense change involving the alteration of a conserved nucleotide. The gene ATP1A3 is a known oncogene (CancerMine: 1 oncogene citations). The variant allele was found at a cumulative frequency of 0.000000687 (AC=1) in the gnomAD database across 1,455,136 control chromosomes (no homozygotes observed). The grpmax filtering allele frequency (95% CI) is 0.000000903. In-silico predictor (REVEL) classifies this variant as likely damaging/oncogenic. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. The affected nucleotide is highly conserved across species (PhyloP 100-way vertebrate score: 7.82). Variant has been reported in ClinVar as Pathogenic/Likely Pathogenic (★★). ClinVar reports functional evidence for this variant: "SCV000645400: This variant disrupts the p.Arg756 amino acid residue in ATP1A3. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID:26400718, 27268479, 27634470, 27726050, 29066118, 29397530)." and additional evidence is available in ClinVar. A different missense at the same amino acid position has been reported as Pathogenic/Likely Pathogenic in ClinVar: p.R756C: Pathogenic/Likely_pathogenic (ClinVar VariationId 425189, 2 stars) The variant has been observed in cBioPortal in 2 samples across 2 studies and 1 cancer type; somatic enrichment level: SUPPORTING_LOW (Observed in a small number of cBioPortal cases.).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: ATP1A3 NM_152296.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:19 O:1
• Conservation: PhyloP100: 7.82
• Publications: 42 publications found

Genes affected

ATP1A3 (HGNC:801): (ATPase Na+/K+ transporting subunit alpha 3) The protein encoded by this gene belongs to the family of P-type cation transport ATPases, and to the subfamily of Na+/K+ -ATPases. Na+/K+ -ATPase is an integral membrane protein responsible for establishing and maintaining the electrochemical gradients of Na and K ions across the plasma membrane. These gradients are essential for osmoregulation, for sodium-coupled transport of a variety of organic and inorganic molecules, and for electrical excitability of nerve and muscle. This enzyme is composed of two subunits, a large catalytic subunit (alpha) and a smaller glycoprotein subunit (beta). The catalytic subunit of Na+/K+ -ATPase is encoded by multiple genes. This gene encodes an alpha 3 subunit. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

ATP1A3 Gene-Disease associations (from GenCC):

• alternating hemiplegia of childhood 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp, Ambry Genetics
• ATP1A3-associated neurological disorder

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, ClinGen, Illumina
• cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics, Orphanet
• developmental and epileptic encephalopathy 99

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• dystonia 12

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics, Orphanet
• encephalopathy, acute, infection-induced

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• alternating hemiplegia of childhood

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• complex neurodevelopmental disorder

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ENSG00000285505 (HGNC:):

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 5 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = 0.000001, AC = 1 — absent/extremely rare (O3 moderate [+2])
	O6Computational evidence supports deleterious effect		Computational evidence supports a deleterious/oncogenic effect; Missense variant — primary computational scorer supports an oncogenic/deleterious effect
	O7Mutational hotspot or critical domain		Supporting: cancerhotspots.org hit, critical domain, or missense neighbourhood hotspot; No cancerhotspots.org hit at this position; UniProt domain: 0 pathogenic, 0 benign.; ±8 AA neighbourhood: 6 pathogenic, 0 benign (OR vs. background: 65.0); Variant does not impact splicing — splice-hotspot path not applicable
	O8Missense constraint in gene or region		Missense in gene/domain constrained for missense variation where missense is common disease mechanism (O8 supporting); Gene/disease mechanism: missense is a common mechanism of oncogenesis; gnomAD missense Z-score: 9.14 (threshold ≥3.09 for constraint); Domain-level constraint: variant is in a critically constrained functional domain (IS_AT_CRITICAL_DOMAIN)

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_152296.5. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	ATP1A3 NM_152296.5	MANE Select	c.2267G>A p.Arg756His	missense	Exon 17 of 23	Prot: NP_689509.1 UniProt:
	ATP1A3 NM_001256214.2		c.2306G>A p.Arg769His	missense	Exon 17 of 23	Prot: NP_001243143.1 UniProt:
	ATP1A3 NM_001256213.2		c.2300G>A p.Arg767His	missense	Exon 17 of 23	Prot: NP_001243142.1 UniProt:

ATP1A3 NM_152296.5

MANE Select

HGVSc / HGVSpc.2267G>Ap.Arg756His

Exon rankExon 17 of 23

missense

Prot: NP_689509.1UniProt: P13637-1

ATP1A3 NM_001256214.2

HGVSc / HGVSpc.2306G>Ap.Arg769His

Exon rankExon 17 of 23

missense

Prot: NP_001243143.1UniProt: P13637-3

ATP1A3 NM_001256213.2

HGVSc / HGVSpc.2300G>Ap.Arg767His

Exon rankExon 17 of 23

missense

Prot: NP_001243142.1UniProt: P13637-2

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	ATP1A3 ENST00000648268.1	MANE Select	c.2267G>A p.Arg756His	missense	Exon 17 of 23	Prot: ENSP00000498113.1 UniProt:
	ENSG00000285505 ENST00000644613.1		n.2267G>A	non_coding_transcript_exon	Exon 17 of 25	Prot: ENSP00000494711.1 UniProt:
	ATP1A3 ENST00000545399.6	TSL:2	c.2306G>A p.Arg769His	missense	Exon 17 of 23	Prot: ENSP00000444688.1 UniProt:

ATP1A3 ENST00000648268.1

MANE Select

HGVSc / HGVSpc.2267G>Ap.Arg756His

Exon rankExon 17 of 23

missense

Prot: ENSP00000498113.1UniProt: P13637-1

ENSG00000285505 ENST00000644613.1

HGVSc / HGVSpn.2267G>A

Exon rankExon 17 of 25

non_coding_transcript_exon

Prot: ENSP00000494711.1UniProt: A0A2R8YEY8

ATP1A3 ENST00000545399.6

TSL:2

HGVSc / HGVSpc.2306G>Ap.Arg769His

Exon rankExon 17 of 23

missense

Prot: ENSP00000444688.1UniProt: P13637-3

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 4 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:32
GnomAD4 exome	AF: 6.87e-7	AC:1	Hom:0	AN:1455136	Cov:34
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:32
ALFA (dbGaP/dbSNP Allele Frequency Aggregator)	AF: 0.00	AC:0	Hom:0	AN:36930	Cov:

Showing 4 sources

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
7	-	-	not provided (7)
3	-	-	Alternating hemiplegia of childhood 2 (3)
3	-	-	Dystonia 12 (4)
2	-	-	ATP1A3-related disorder (2)
1	-	-	ATP1A3-associated neurological disorder (1)
1	-	-	Cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndrome (1)
1	-	-	Developmental and epileptic encephalopathy 99 (1)
1	-	-	Inborn genetic diseases (1)

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Pathogenic	30
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.77	D
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.99	D
FuncVEP CTI	Pathogenic	1.0
GPN-Star LLR	N/A	-7.4
GPN-Star score	N/A	7.4
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
Mutation Taster	N/A	0/100	disease causing (ClinVar)
MutationAssessor	Pathogenic	4.3	H
PhyloP100	Pathogenic	7.8
popEVE	Uncertain	-5.0
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.7	D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Varity_R	N/A	0.66
VESM-3B	Benign	-12

Showing 28 of 28 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.010
SpliceAI score (max)	Benign	0.020	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs606231435;

hg19: chr19-42474691;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar