rs796052235

chrX-41346376-G-AchrX-41346376-G-C

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_001356.5(DDX3X):c.1463G>A(p.Arg488His) variant causes a missense 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. 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. R488C) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 22)
• Consequence: DDX3X NM_001356.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 9.94

Genes affected

DDX3X (HGNC:2745): (DEAD-box helicase 3 X-linked) The protein encoded by this gene is a member of the large DEAD-box protein family, that is defined by the presence of the conserved Asp-Glu-Ala-Asp (DEAD) motif, and has ATP-dependent RNA helicase activity. This protein has been reported to display a high level of RNA-independent ATPase activity, and unlike most DEAD-box helicases, the ATPase activity is thought to be stimulated by both RNA and DNA. This protein has multiple conserved domains and is thought to play roles in both the nucleus and cytoplasm. Nuclear roles include transcriptional regulation, mRNP assembly, pre-mRNA splicing, and mRNA export. In the cytoplasm, this protein is thought to be involved in translation, cellular signaling, and viral replication. Misregulation of this gene has been implicated in tumorigenesis. This gene has a paralog located in the nonrecombining region of the Y chromosome. Pseudogenes sharing similarity to both this gene and the DDX3Y paralog are found on chromosome 4 and the X chromosome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2014]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_001356.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-41346376-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 1330240.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant where missense usually causes diseases, DDX3X
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.955
• PP5: Variant X-41346376-G-A is Pathogenic according to our data. Variant chrX-41346376-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 207817.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-41346376-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DDX3X	NM_001356.5	c.1463G>A	p.Arg488His	missense_variant	13/17	ENST00000644876.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DDX3X	ENST00000644876.2	c.1463G>A	p.Arg488His	missense_variant	13/17		NM_001356.5	A1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Oct 13, 2023	This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 488 of the DDX3X protein (p.Arg488His). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of DDX3X-related conditions (PMID: 26235985, 33504798). In at least one individual the variant was observed to be de novo. This variant is also known as X:41205629G>A. ClinVar contains an entry for this variant (Variation ID: 207817). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant disrupts the p.Arg488 amino acid residue in DDX3X. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 30734472, 32135084, 33504798). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jun 01, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Sep 23, 2021	Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function This variant is associated with the following publications: (PMID: 26235985) -

Intellectual disability, X-linked 102 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

May 17, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.75
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
Cadd	Pathogenic	29
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.84	D;D;.;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Pathogenic	0.69	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.075	D
MutationAssessor	Uncertain	2.5	M;M;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.82	D
Polyphen		0.91	P;P;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Vest4		0.89, 0.91, 0.89, 0.85
MutPred		0.81		Gain of glycosylation at S489 (P = 0.1053);Gain of glycosylation at S489 (P = 0.1053);Gain of glycosylation at S489 (P = 0.1053);Gain of glycosylation at S489 (P = 0.1053);.;.;Gain of glycosylation at S489 (P = 0.1053);.;Gain of glycosylation at S489 (P = 0.1053);.;.;Gain of glycosylation at S489 (P = 0.1053);.;.;.;.;.;.;.;
MVP		0.96
MPC		2.1
ClinPred		0.99	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.92

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

Other links and lift over

dbSNP: rs796052235; hg19: chrX-41205629; COSMIC: COSV67864331; COSMIC: COSV67864331;