rs878853107

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PP3_Moderate

The NM_139058.3(ARX):c.91A>C(p.Ser31Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000579 in 1,208,250 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 1 hem., cov: 24)

Exomes 𝑓: 0.0000046 ( 0 hom. 1 hem. )

Consequence

ARX
NM_139058.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 7.04

Variant links:

Genes affected

ARX (HGNC:18060): (aristaless related homeobox) This gene is a homeobox-containing gene expressed during development. The expressed protein contains two conserved domains, a C-peptide (or aristaless domain) and the prd-like class homeobox domain. It is a member of the group-II aristaless-related protein family whose members are expressed primarily in the central and/or peripheral nervous system. This gene is thought to be involved in CNS development. Expansion of a polyalanine tract and other mutations in this gene cause X-linked cognitive disability and epilepsy. [provided by RefSeq, Jul 2016]

ARX links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.86

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ARX	NM_139058.3 linkuse as main transcript	c.91A>C	p.Ser31Arg	missense_variant	1/5	ENST00000379044.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
ARX	ENST00000379044.5 linkuse as main transcript	c.91A>C	p.Ser31Arg	missense_variant	1/5	1	NM_139058.3	P1
ARX	ENST00000636609.1 linkuse as main transcript	n.36-2A>C		splice_acceptor_variant, non_coding_transcript_variant		5
ARX	ENST00000637394.1 linkuse as main transcript	n.68-2A>C		splice_acceptor_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes

AF:

0.0000178

AC:

AN:

112253

Hom.:

Cov.:

AF XY:

0.0000291

AC XY:

AN XY:

34409

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000376

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000456

AC:

AN:

1095997

Hom.:

Cov.:

AF XY:

0.00000277

AC XY:

AN XY:

361591

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000595

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000178

AC:

AN:

112253

Hom.:

Cov.:

AF XY:

0.0000291

AC XY:

AN XY:

34409

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000376

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	May 10, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 01, 2017	A variant of uncertain significance has been identified in the ARX gene. The S31R variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The S31R variant is observed in 2/46,995 alleles from individuals undergoing testing at GeneDx including a hemizygous individual (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The S31R 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, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 21, 2022

The c.91A>C (p.S31R) alteration is located in exon 1 (coding exon 1) of the ARX gene. This alteration results from a A to C substitution at nucleotide position 91, causing the serine (S) at amino acid position 31 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Intellectual disability, X-linked, with or without seizures, arx-related;C3463992:Developmental and epileptic encephalopathy, 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 27, 2023

This sequence change replaces serine, which is neutral and polar, with arginine, which is basic and polar, at codon 31 of the ARX protein (p.Ser31Arg). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with ARX-related conditions. ClinVar contains an entry for this variant (Variation ID: 235754). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ARX protein function. 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

1.0

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.23

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Benign

0.38

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.90

M_CAP

Pathogenic

0.66

MetaRNN

Pathogenic

0.86

MetaSVM

Uncertain

0.68

MutationAssessor

Uncertain

2.0

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.88

PROVEAN

Uncertain

-2.8

REVEL

Pathogenic

0.67

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.79

MutPred

0.29

Gain of MoRF binding (P = 0.0087);

MVP

0.98

MPC

1.3

ClinPred

0.98

GERP RS

5.2

Varity_R

0.94

gMVP

0.79

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over