X-107628697-G-T

Variant names:

• chrX-107628697-G-T
• rs1925240689
• NM_002764.4:c.69G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001204402.2(PRPS1):​c.-136G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 22)
• Consequence: PRPS1 NM_001204402.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.773
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Arts syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• Charcot-Marie-Tooth disease X-linked recessive 5

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, PanelApp Australia, G2P
• hearing loss, X-linked 1

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia
• phosphoribosylpyrophosphate synthetase superactivity

  Inheritance: XL Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen
• PRPS1 deficiency disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• mild phosphoribosylpyrophosphate synthetase superactivity

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• severe phosphoribosylpyrophosphate synthetase superactivity

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• X-linked intellectual disability-limb spasticity-retinal dystrophy-diabetes insipidus syndrome

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• X-linked nonsyndromic hearing loss

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000294392 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.37).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001204402.2. 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
	PRPS1	NM_002764.4	MANE Select	c.69G>T	p.Leu23Leu	synonymous	Exon 1 of 7	NP_002755.1	P60891-1
	PRPS1	NM_001204402.2		c.-136G>T		5_prime_UTR_premature_start_codon_gain	Exon 1 of 4	NP_001191331.1	B7ZB02
	PRPS1	NM_001204402.2		c.-136G>T		5_prime_UTR	Exon 1 of 4	NP_001191331.1	B7ZB02

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRPS1	ENST00000372435.10	TSL:1 MANE Select	c.69G>T	p.Leu23Leu	synonymous	Exon 1 of 7	ENSP00000361512.4	P60891-1
	PRPS1	ENST00000643795.2		c.69G>T	p.Leu23Leu	synonymous	Exon 1 of 7	ENSP00000496286.1	A0A2R8Y7H4
	PRPS1	ENST00000372418.4	TSL:3	c.69G>T	p.Leu23Leu	synonymous	Exon 1 of 6	ENSP00000361495.2	B1ALA9

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.37
CADD	Benign	12
DANN	Benign	0.93
PhyloP100		0.77
PromoterAI		-0.092	Neutral

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

Other links and lift over

dbSNP: rs1925240689; hg19: chrX-106871927;