chrX-107628719-GT-G

Position:

• chrX-107628719-GT-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Strong PM2

The NM_002764.4(PRPS1):​c.92delT​(p.Val31fs) variant causes a frameshift change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: PRPS1 NM_002764.4 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.42

Genes affected

PRPS1 (HGNC:9462): (phosphoribosyl pyrophosphate synthetase 1) This gene encodes an enzyme that catalyzes the phosphoribosylation of ribose 5-phosphate to 5-phosphoribosyl-1-pyrophosphate, which is necessary for purine metabolism and nucleotide biosynthesis. Defects in this gene are a cause of phosphoribosylpyrophosphate synthetase superactivity, Charcot-Marie-Tooth disease X-linked recessive type 5 and Arts Syndrome. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Feb 2011]

PRPS1 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.904 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PRPS1	NM_002764.4	c.92delT	p.Val31fs	frameshift_variant	1/7	ENST00000372435.10	NP_002755.1
PRPS1	NM_001204402.2	c.-113delT		5_prime_UTR_variant	1/4		NP_001191331.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PRPS1	ENST00000372435.10	c.92delT	p.Val31fs	frameshift_variant	1/7	1	NM_002764.4	ENSP00000361512.4

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 29, 2017

The c.92delT variant in the PRPS1 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The c.92delT variant causes a frameshift starting with codon Valine 31, changes this amino acid to a Glycine residue, and creates a premature Stop codon at position 37 of the new reading frame, denoted p.Val31GlyfsX37. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay; however, loss-of-function is not a known mechanism of disease for the PRPS1 gene. The c.92delT variant is not observed in large population cohorts (Lek et al., 2016). -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.19		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: rs1556297591; hg19: chrX-106871949;