Submissions for variant NM_152296.5(ATP1A3):c.2401G>A (p.Asp801Asn) (rs80356537)

Total submissions: 11

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Ambry Genetics	RCV000624579	SCV000742201	pathogenic	Inborn genetic diseases	2017-04-28	criteria provided, single submitter	clinical testing	Lines of evidence used in support of classification: POSITIVE: Relevant Alteration(s) Detected
Baylor Genetics	RCV000030749	SCV000245456	pathogenic	Alternating hemiplegia of childhood 2	2015-01-06	criteria provided, single submitter	clinical testing	This variant has been previously reported as disease-causing and was found twice in our laboratory as a de novo finding in affected individuals. Once in a 10-month-old female with epilepsy, developmental delay, hypotonia. Once in a 28-year-old femle with hemiplegic cerebral palsy, seizures, scoliosis, GI problems, intellectual disability.
Courtagen Diagnostics Laboratory,Courtagen Life Sciences	RCV000030749	SCV000236542	pathogenic	Alternating hemiplegia of childhood 2	2015-03-09	criteria provided, single submitter	clinical testing
EGL Genetic Diagnostics,Eurofins Clinical Diagnostics	RCV000413511	SCV000336178	pathogenic	not provided	2015-10-05	criteria provided, single submitter	clinical testing
Fulgent Genetics,Fulgent Genetics	RCV000515424	SCV000611249	pathogenic	Cerebellar ataxia, areflexia, pes cavus, optic atrophy and sensorinural hearing loss; Dystonia 12; Alternating hemiplegia of childhood 2	2017-05-18	criteria provided, single submitter	clinical testing
GeneDx	RCV000413511	SCV000490416	pathogenic	not provided	2018-12-03	criteria provided, single submitter	clinical testing	The D801N variant in the ATP1A3 gene has been reported previously in patients with alternating hemiplegia of childhood (Rosewich et al., 2012; Heinzen et al., 2012; Yang et al., 2014). In all cases in which family studies were performed, the D801N variant was shown to arise de novo. D801N is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The D801N variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position that is conserved across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. The D801N variant is suggested to affect the activity of the Na+/K+ ATPase pump and the substitution of an Aspartic acid for an Asparagine at position 801 is predicted to prevent the normal binding of potassium ions (Heinzen et al., 2012). We interpret D801N as a pathogenic variant.
GeneReviews	RCV000030749	SCV000195709	pathogenic	Alternating hemiplegia of childhood 2	2014-05-04	no assertion criteria provided	literature only
Genetic Services Laboratory, University of Chicago	RCV000030749	SCV000246631	pathogenic	Alternating hemiplegia of childhood 2	2014-10-10	criteria provided, single submitter	clinical testing
Invitae	RCV000644928	SCV000766650	pathogenic	Dystonia 12	2018-12-12	criteria provided, single submitter	clinical testing	This sequence change replaces aspartic acid with asparagine at codon 801 of the ATP1A3 protein (p.Asp801Asn). The aspartic acid residue is moderately conserved and there is a small physicochemical difference between aspartic acid and asparagine. This variant is not present in population databases (ExAC no frequency). This variant has been reported to be de novo in multiple individuals affected with alternating hemiplegia of childhood (PMID: 22842232, 22850527, 23409136, 24842602, 24431296. ClinVar contains an entry for this variant (Variation ID: 37107). Experimental studies have shown that this missense change p.Asp801Asn causes reduced ATPase enzyme activity (PMID: 22842232), loss of potassium binding (PMID: 24631656), reduced forward cycling and dominant negativity (PMID: 25681536), and spontaneous recurrent seizures in mice (PMID: 25523819). Multiple missense substitutions at this codon (p.D801E ; p.D801V) have been reported in patients with alternating hemiplegia of childhood (PMID: 24100174, PMID: 26410222). This suggests that the aspartic acid residue is critical for ATP1A3 protein function. For these reasons, this variant has been classified as Pathogenic.
OMIM	RCV000030749	SCV000053410	pathogenic	Alternating hemiplegia of childhood 2	2014-01-01	no assertion criteria provided	literature only
SIB Swiss Institute of Bioinformatics	RCV000030749	SCV000803614	pathogenic	Alternating hemiplegia of childhood 2	2018-05-31	criteria provided, single submitter	curation	This variant is interpreted as a Pathogenic, for Alternating hemiplegia of childhood-2, in Autosomal Dominant manner. The following ACMG Tag(s) were applied: PP3 => Multiple lines of computational evidence support a deleterious effect on the gene or gene product. PS3 => Well-established functional studies show a deleterious effect (PMID:22842232). PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PS4-Moderate => PS4 downgraded in strength to Moderate (PMID:23409136) (PMID:22842232). PS2 => De novo (paternity and maternity confirmed) (PMID:23409136) (PMID:22842232).