X-22033006-A-T

Variant names:

• chrX-22033006-A-T
• NM_000444.6:c.1A>T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_000444.6(PHEX):​c.1A>T​(p.Met1?) variant causes a initiator codon change. 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: 22)
• Consequence: PHEX NM_000444.6 initiator_codon
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.75

Genes affected

PHEX (HGNC:8918): (phosphate regulating endopeptidase X-linked) The protein encoded by this gene is a transmembrane endopeptidase that belongs to the type II integral membrane zinc-dependent endopeptidase family. The protein is thought to be involved in bone and dentin mineralization and renal phosphate reabsorption. Mutations in this gene cause X-linked hypophosphatemic rickets. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 3 pathogenic variants. Next in-frame start position is after 98 codons. Genomic position: 22047154. Lost 0.130 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-22033006-A-T is Pathogenic according to our data. Variant chrX-22033006-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 2012752.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHEX	NM_000444.6	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 22	ENST00000379374.5	NP_000435.3
PHEX	NM_001282754.2	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 21		NP_001269683.1
PHEX	XM_047442159.1	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 13		XP_047298115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PHEX	ENST00000379374.5	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 22	1	NM_000444.6	ENSP00000368682.4
PHEX	ENST00000684143.1	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 11			ENSP00000508264.1
PHEX	ENST00000475778.2	n.427A>T		non_coding_transcript_exon_variant	Exon 1 of 9	5
PHEX	ENST00000683214.1	n.427A>T		non_coding_transcript_exon_variant	Exon 1 of 2

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Jul 18, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Disruption of the initiator codon has been observed in individual(s) with X-linked hypophosphatemia (PMID: 30682568; Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the PHEX mRNA. The next in-frame methionine is located at codon 98. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Benign	19
DANN	Benign	0.96
DEOGEN2	Benign	0.24	T
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Uncertain	-0.062	T
PROVEAN	Benign	-0.26	N
REVEL	Uncertain	0.50
Sift	Benign	0.19	T
Sift4G	Pathogenic	0.0	D
Polyphen		0.17	B
Vest4		0.85
MutPred		0.61		Gain of stability (P = 0.2886);
MVP		0.98
ClinPred		0.97	D
GERP RS		5.3
Varity_R		0.36
gMVP		0.81

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-22051124;