X-43949931-AC-GG

Variant names:

• chrX-43949931-AC-GG
• NM_000266.4:c.269_270delGTinsCC
• NDP p.Arg90Pro

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM5 PP2

The NM_000266.4(NDP):​c.269_270delGTinsCC​(p.Arg90Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R90H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: NDP NM_000266.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.70
• Publications: 0 publications found

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

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_000266.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-43949933-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 373948.Status of the report is criteria_provided_single_submitter, 1 stars.
• 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, exudative vitreoretinopathy 2, X-linked, persistent hyperplastic primary vitreous.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000266.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDP	NM_000266.4	MANE Select	c.269_270delGTinsCC	p.Arg90Pro	missense	N/A	NP_000257.1	Q00604
	NDP-AS1	NR_046631.1		n.200_201delACinsGG		non_coding_transcript_exon	Exon 1 of 6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDP	ENST00000642620.1	MANE Select	c.269_270delGTinsCC	p.Arg90Pro	missense	N/A	ENSP00000495972.1	Q00604
	NDP	ENST00000647044.1		c.269_270delGTinsCC	p.Arg90Pro	missense	N/A	ENSP00000495811.1	Q00604
	NDP	ENST00000868527.1		c.269_270delGTinsCC	p.Arg90Pro	missense	N/A	ENSP00000538586.1

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.7

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chrX-43809177;