rs1555953796

Positions:

• chrX-41345187-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001356.5(DDX3X):​c.1033G>C​(p.Val345Leu) 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 other (no stars).

• Frequency: Genomes: not found (cov: 23)
• Consequence: DDX3X NM_001356.5 missense
• Clinical Significance: other no assertion criteria provided O:1
• Conservation: PhyloP100: 8.08

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 Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), DDX3X. . Gene score misZ 4.3295 (greater than the threshold 3.09). GenCC has associacion of gene with X-linked intellectual disability-hypotonia-movement disorder syndrome, Toriello-Carey syndrome, intellectual disability, X-linked 102, X-linked syndromic intellectual disability.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.887

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DDX3X	NM_001356.5	c.1033G>C	p.Val345Leu	missense_variant	11/17	ENST00000644876.2	NP_001347.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DDX3X	ENST00000644876.2	c.1033G>C	p.Val345Leu	missense_variant	11/17		NM_001356.5	ENSP00000494040	A1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: other

Submissions summary: Other:1

Revision: no assertion criteria provided

Submissions by phenotype

Medulloblastoma Other:1

other, no assertion criteria provided

clinical testing

Donald Williams Parsons Laboratory, Baylor College of Medicine

May 01, 2016

- 3: Mutations in other consensus cancer genes, not currently considered targetable

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.38	T;T;.;T;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.95	.;.;D;D;D;D;D;D;D;D;D;D;D;.;.;D;.;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.89	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.0094	D
MutationAssessor	Pathogenic	3.7	H;H;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-2.6	.;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.
REVEL	Uncertain	0.40
Sift	Uncertain	0.0010	.;.;.;.;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Sift4G	Uncertain	0.0060	.;D;D;D;D;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Polyphen		0.93	P;P;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.;.
Vest4		0.59, 0.58, 0.59, 0.59
MutPred		0.81		Loss of methylation at K342 (P = 0.0876);Loss of methylation at K342 (P = 0.0876);Loss of methylation at K342 (P = 0.0876);Loss of methylation at K342 (P = 0.0876);.;.;Loss of methylation at K342 (P = 0.0876);.;Loss of methylation at K342 (P = 0.0876);.;.;Loss of methylation at K342 (P = 0.0876);.;.;.;.;.;.;.;
MVP		0.89
MPC		2.5
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		0.99

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: rs1555953796; hg19: chrX-41204440; COSMIC: COSV67864211; COSMIC: COSV67864211;