NM_139058.3:c.351C>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2

The NM_139058.3(ARX):c.351C>A(p.Ala117Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000289 in 761,271 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 9 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.000019 ( 0 hom., 1 hem., cov: 22)

Exomes 𝑓: 0.000031 ( 0 hom. 8 hem. )

Consequence

ARX
NM_139058.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 0.789

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

genetic developmental and epileptic encephalopathy
Inheritance: XL, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
intellectual disability, X-linked, with or without seizures, ARX-related
Inheritance: XL Classification: DEFINITIVE, MODERATE Submitted by: Ambry Genetics, G2P
Partington syndrome
Inheritance: XL Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
X-linked complex neurodevelopmental disorder
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
X-linked lissencephaly with abnormal genitalia
Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp
infantile spasms
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
corpus callosum agenesis-abnormal genitalia syndrome
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
infantile epileptic-dyskinetic encephalopathy
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
non-syndromic X-linked intellectual disability
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
X-linked spasticity-intellectual disability-epilepsy syndrome
Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ARX links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -17 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.58).

BP6

Variant X-25013644-G-T is Benign according to our data. Variant chrX-25013644-G-T is described in ClinVar as Likely_benign. ClinVar VariationId is 540223.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.789 with no splicing effect.

BS2

High AC in GnomAdExome4 at 20 AD,XL gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARX	NM_139058.3 link	c.351C>A	p.Ala117Ala	synonymous_variant	Exon 2 of 5	ENST00000379044.5	NP_620689.1	Q96QS3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARX	ENST00000379044.5 link	c.351C>A	p.Ala117Ala	synonymous_variant	Exon 2 of 5	1	NM_139058.3	ENSP00000368332.4		Q96QS3

Frequencies

GnomAD3 genomes

AF:

0.0000188

AC:

AN:

106647

Hom.:

Cov.:

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:

0.0000393

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000306

AC:

AN:

654624

Hom.:

Cov.:

AF XY:

0.0000402

AC XY:

AN XY:

198926

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

12668

American (AMR)

AF:

0.00

AC:

AN:

1137

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

4174

East Asian (EAS)

AF:

0.00

AC:

AN:

3511

South Asian (SAS)

AF:

0.00

AC:

AN:

12790

European-Finnish (FIN)

AF:

0.00

AC:

AN:

1019

Middle Eastern (MID)

AF:

0.00

AC:

AN:

1164

European-Non Finnish (NFE)

AF:

0.0000335

AC:

AN:

596303

Other (OTH)

AF:

0.00

AC:

AN:

21858

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000188

AC:

AN:

106647

Hom.:

Cov.:

AF XY:

0.0000316

AC XY:

AN XY:

31651

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

30196

American (AMR)

AF:

0.00

AC:

AN:

10436

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2575

East Asian (EAS)

AF:

0.00

AC:

AN:

3337

South Asian (SAS)

AF:

0.00

AC:

AN:

2637

European-Finnish (FIN)

AF:

0.00

AC:

AN:

4295

Middle Eastern (MID)

AF:

0.00

AC:

AN:

201

European-Non Finnish (NFE)

AF:

0.0000393

AC:

AN:

50857

Other (OTH)

AF:

0.00

AC:

AN:

1470

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Jun 17, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

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

Benign:1

Apr 26, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.58

CADD

Benign

(source)

DANN

Benign

0.93

PhyloP100

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over