rs1553597653

Positions:

• chr2-178444441-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_003690.5(PRKRA):​c.377A>G​(p.Asn126Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 35)
• Consequence: PRKRA NM_003690.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.69

Genes affected

PRKRA (HGNC:9438): (protein activator of interferon induced protein kinase EIF2AK2) This gene encodes a protein kinase activated by double-stranded RNA which mediates the effects of interferon in response to viral infection. Mutations in this gene have been associated with dystonia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2008]

PRKRA (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PRKRA	NM_003690.5	c.377A>G	p.Asn126Ser	missense_variant	4/8	ENST00000325748.9	NP_003681.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PRKRA	ENST00000325748.9	c.377A>G	p.Asn126Ser	missense_variant	4/8	1	NM_003690.5	ENSP00000318176.4

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD4 exome Cov.: 41

GnomAD4 genome Cov.: 35

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dystonia 16 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 22, 2018

This sequence change replaces asparagine with serine at codon 126 of the PRKRA protein (p.Asn126Ser). The asparagine residue is highly conserved and there is a small physicochemical difference between asparagine and serine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with PRKRA-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.73
BayesDel_addAF	Benign	-0.027	T
BayesDel_noAF	Benign	-0.28
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.56	D;.;.
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.81	T;T;T
M_CAP	Benign	0.037	D
MetaRNN	Uncertain	0.69	D;D;D
MetaSVM	Uncertain	0.072	D
MutationAssessor	Uncertain	2.3	M;.;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Uncertain	-4.3	D;D;D
REVEL	Uncertain	0.50
Sift	Uncertain	0.029	D;D;D
Sift4G	Benign	0.12	T;T;T
Polyphen		0.86	P;.;D
Vest4		0.58
MutPred		0.55		Gain of glycosylation at N126 (P = 0.0477);.;.;
MVP		0.83
MPC		1.1
ClinPred		0.99	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.15
gMVP		0.78

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

Publications

LitVar

Other links and lift over

dbSNP: rs1553597653; hg19: chr2-179309168;