chrX-43949833-A-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1PM2PP2PP3_StrongPP5_Moderate

The NM_000266.4(NDP):c.368T>A(p.Ile123Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000933 in 1,071,578 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: not found (cov: 22)

Exomes 𝑓: 9.3e-7 ( 0 hom. 1 hem. )

Consequence

NDP
NM_000266.4 missense

Scores

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 8.91

Publications

0 publications found

Variant links:

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 links:

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

NDP-AS1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 11 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 uncertain in NM_000266.4

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 32 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to Norrie disease, exudative vitreoretinopathy 2, X-linked, exudative vitreoretinopathy, persistent hyperplastic primary vitreous.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.977

PP5

Variant X-43949833-A-T is Pathogenic according to our data. Variant chrX-43949833-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2737210.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NDP	NM_000266.4 link	c.368T>A	p.Ile123Asn	missense_variant	Exon 3 of 3	ENST00000642620.1	NP_000257.1	Q00604
NDP-AS1	NR_046631.1 link	n.102A>T		non_coding_transcript_exon_variant	Exon 1 of 6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
NDP	ENST00000642620.1 link	c.368T>A	p.Ile123Asn	missense_variant	Exon 3 of 3		NM_000266.4	ENSP00000495972.1	Q00604
NDP	ENST00000647044.1 link	c.368T>A	p.Ile123Asn	missense_variant	Exon 4 of 4			ENSP00000495811.1	Q00604
NDP-AS1	ENST00000435093.1 link	n.102A>T		non_coding_transcript_exon_variant	Exon 1 of 5	3
NDP	ENST00000470584.1 link	n.412T>A		non_coding_transcript_exon_variant	Exon 3 of 3	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

9.33e-7

AC:

AN:

1071578

Hom.:

Cov.:

AF XY:

0.00000286

AC XY:

AN XY:

349288

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

25790

American (AMR)

AF:

0.00

AC:

AN:

30782

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

18856

East Asian (EAS)

AF:

0.00

AC:

AN:

28635

South Asian (SAS)

AF:

0.00

AC:

AN:

50844

European-Finnish (FIN)

AF:

0.00

AC:

AN:

38784

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4106

European-Non Finnish (NFE)

AF:

0.00000121

AC:

AN:

828630

Other (OTH)

AF:

0.00

AC:

AN:

45151

GnomAD4 genome

Cov.:

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Oct 22, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with asparagine, which is neutral and polar, at codon 123 of the NDP protein (p.Ile123Asn). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Norrie disease (PMID: 7627181; Invitae). 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. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.40

BayesDel_noAF

Pathogenic

0.33

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.95

D;D;D

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.94

.;.;D

M_CAP

Pathogenic

0.91

MetaRNN

Pathogenic

0.98

D;D;D

MetaSVM

Uncertain

0.75

MutationAssessor

Benign

0.97

L;L;L

PhyloP100

8.9

PrimateAI

Pathogenic

0.86

PROVEAN

Pathogenic

-6.1

.;D;.

REVEL

Pathogenic

0.85

Sift

Pathogenic

0.0

.;D;.

Sift4G

Pathogenic

0.0

.;D;.

Polyphen

1.0

D;D;D

Vest4

0.93

MutPred

0.84

Gain of disorder (P = 0.0014);Gain of disorder (P = 0.0014);Gain of disorder (P = 0.0014);

MVP

0.98

MPC

1.9

ClinPred

1.0

GERP RS

6.0

Varity_R

0.98

gMVP

0.99

Mutation Taster

=6/94

disease causing

(source)

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over