chr19-41970389-A-C

Position:

• chr19-41970389-A-C

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_152296.5(ATP1A3):​c.2417T>G​(p.Met806Arg) variant causes a missense, splice region 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. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M806K) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATP1A3 NM_152296.5 missense, splice_region
• Scores: Splicing: ADA: 0.4410
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.15

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]

ENSG00000285505 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM1: In a transmembrane_region Helical (size 20) in uniprot entity AT1A3_HUMAN there are 16 pathogenic changes around while only 0 benign (100%) in NM_152296.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr19-41970389-A-T is described in Lovd as [Likely_pathogenic].
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ATP1A3. . Gene score misZ 6.3327 (greater than the threshold 3.09). Trascript score misZ 9.1232 (greater than threshold 3.09). GenCC has associacion of gene with dystonia 12, alternating hemiplegia of childhood 2, ATP1A3-associated neurological disorder, developmental and epileptic encephalopathy 99, alternating hemiplegia of childhood, cerebellar ataxia-areflexia-pes cavus-optic atrophy-sensorineural hearing loss syndrome, alternating hemiplegia of childhood 1, encephalopathy, acute, infection-induced.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.957
• PP5: Variant 19-41970389-A-C is Pathogenic according to our data. Variant chr19-41970389-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 161142.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr19-41970389-A-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATP1A3	NM_152296.5	c.2417T>G	p.Met806Arg	missense_variant, splice_region_variant	17/23	ENST00000648268.1	NP_689509.1
ATP1A3	NM_001256214.2	c.2456T>G	p.Met819Arg	missense_variant, splice_region_variant	17/23		NP_001243143.1
ATP1A3	NM_001256213.2	c.2450T>G	p.Met817Arg	missense_variant, splice_region_variant	17/23		NP_001243142.1
ATP1A3	XM_047438862.1	c.2327T>G	p.Met776Arg	missense_variant, splice_region_variant	17/23		XP_047294818.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATP1A3	ENST00000648268.1	c.2417T>G	p.Met806Arg	missense_variant, splice_region_variant	17/23		NM_152296.5	ENSP00000498113.1
ENSG00000285505	ENST00000644613.1	n.2417T>G		splice_region_variant, non_coding_transcript_exon_variant	17/25			ENSP00000494711.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dystonia 12 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 08, 2017

This sequence change replaces methionine with arginine at codon 806 of the ATP1A3 protein (p.Met806Arg). The methionine residue is moderately conserved and there is a moderate physicochemical difference between methionine and arginine. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This missense change is located in a region of the ATP1A3 protein where a significant number of previously reported ATP1A3 missense mutations are found (PMID: 24523486). These observations suggest that a previously unreported missense substitution within this region may affect protein function, but experiments have not been done to test this possibility. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). This variant has been reported in several individuals affected with alternating hemiplegia of childhood (PMID: 22842232, 26410222). ClinVar contains an entry for this variant (Variation ID: 161142). This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	28
DANN	Uncertain	0.98
DEOGEN2	Pathogenic	0.93	D;D;D;.;.
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.95	.;D;D;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.8	H;H;.;.;.
PrimateAI	Pathogenic	0.85	D
PROVEAN	Uncertain	-3.8	.;D;.;D;D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	.;D;.;D;D
Sift4G	Pathogenic	0.0010	.;D;D;D;D
Polyphen		0.43	B;B;.;.;.
Vest4		0.93, 0.95, 0.93
MutPred		0.80		Gain of methylation at M806 (P = 0.0676);Gain of methylation at M806 (P = 0.0676);.;.;.;
MVP		1.0
MPC		2.0
ClinPred		1.0	D
GERP RS		3.8
Varity_R		0.98
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.44
dbscSNV1_RF	Benign	0.56
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: rs549006436; hg19: chr19-42474541;