X-43949913-G-T

Position:

• chrX-43949913-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_000266.4(NDP):​c.288C>A​(p.Cys96Ter) variant causes a stop gained change involving the alteration of a non-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 Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: NDP NM_000266.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.83

Genes affected

NDP (HGNC:7678): (norrin cystine knot growth factor NDP) This gene encodes a secreted protein with a cystein-knot motif that activates the Wnt/beta-catenin pathway. The protein forms disulfide-linked oligomers in the extracellular matrix. Mutations in this gene result in Norrie disease and X-linked exudative vitreoretinopathy. [provided by RefSeq, Feb 2009]

NDP-AS1 (HGNC:40395): (NDP antisense RNA 1)

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 16 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-43949913-G-T is Pathogenic according to our data. Variant chrX-43949913-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 1459580.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NDP	NM_000266.4	c.288C>A	p.Cys96Ter	stop_gained	3/3	ENST00000642620.1	NP_000257.1
NDP-AS1	NR_046631.1	n.182G>T		non_coding_transcript_exon_variant	1/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NDP	ENST00000642620.1	c.288C>A	p.Cys96Ter	stop_gained	3/3		NM_000266.4	ENSP00000495972	P1
NDP-AS1	ENST00000435093.1	n.182G>T		non_coding_transcript_exon_variant	1/5	3
NDP	ENST00000647044.1	c.288C>A	p.Cys96Ter	stop_gained	4/4			ENSP00000495811	P1
NDP	ENST00000470584.1	n.332C>A		non_coding_transcript_exon_variant	3/3	2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 18, 2021

For these reasons, this variant has been classified as Pathogenic. This variant disrupts the C-terminus of the NDP protein. Other variant(s) that disrupt this region (p.Cys131*) have been determined to be pathogenic (PMID: 25711638, Invitae). This suggests that variants that disrupt this region of the protein are likely to be causative of disease. This variant has not been reported in the literature in individuals with NDP-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Cys96*) in the NDP gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 38 amino acid(s) of the NDP protein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.67	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	34
DANN	Uncertain	0.99
FATHMM_MKL	Uncertain	0.91	D
MutationTaster	Benign	1.0	D
Vest4		0.91
GERP RS		4.2

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-43809159;