X-43949831-G-A

Position:

• chrX-43949831-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_000266.4(NDP):​c.370C>T​(p.Leu124Phe) 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 Pathogenic (★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: NDP NM_000266.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 9.56

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.

• PM1: In a disulfide_bond (size 61) in uniprot entity NDP_HUMAN there are 24 pathogenic changes around while only 0 benign (100%) in NM_000266.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.937
• PP5: Variant X-43949831-G-A is Pathogenic according to our data. Variant chrX-43949831-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 10684.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-43949831-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NDP	NM_000266.4	c.370C>T	p.Leu124Phe	missense_variant	3/3	ENST00000642620.1	NP_000257.1
NDP-AS1	NR_046631.1	n.100G>A		non_coding_transcript_exon_variant	1/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NDP	ENST00000642620.1	c.370C>T	p.Leu124Phe	missense_variant	3/3		NM_000266.4	ENSP00000495972.1
NDP	ENST00000647044.1	c.370C>T	p.Leu124Phe	missense_variant	4/4			ENSP00000495811.1
NDP-AS1	ENST00000435093.1	n.100G>A		non_coding_transcript_exon_variant	1/5	3
NDP	ENST00000470584.1	n.414C>T		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:2

Revision: criteria provided, single submitter

Submissions by phenotype

Exudative vitreoretinopathy 2, X-linked Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 01, 1993

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 27, 2023

For these reasons, this variant has been classified as Pathogenic. 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 NDP protein function. ClinVar contains an entry for this variant (Variation ID: 10684). This missense change has been observed in individual(s) with familial exudative vitreoretinopathy (PMID: 8252044). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 124 of the NDP protein (p.Leu124Phe). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;D;D
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.91	.;.;D
M_CAP	Pathogenic	0.84	D
MetaRNN	Pathogenic	0.94	D;D;D
MetaSVM	Uncertain	0.67	D
MutationAssessor	Benign	0.90	L;L;L
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-1.5	.;N;.
REVEL	Pathogenic	0.85
Sift	Uncertain	0.015	.;D;.
Sift4G	Uncertain	0.051	.;T;.
Polyphen		1.0	D;D;D
Vest4		0.90
MutPred		0.74		Gain of sheet (P = 0.0101);Gain of sheet (P = 0.0101);Gain of sheet (P = 0.0101);
MVP		0.98
MPC		1.5
ClinPred		0.94	D
GERP RS		6.0
Varity_R		0.87
gMVP		0.91

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: rs28933684; hg19: chrX-43809077; COSMIC: COSV65203741;