NM_002764.4:c.362C>G

Variant names:

• chrX-107640957-C-G
• rs587777150
• NM_002764.4:c.362C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3 PP5

The NM_002764.4(PRPS1):​c.362C>G​(p.Ala121Gly) variant causes a missense change involving the alteration of a conserved nucleotide. 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 (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A121E) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 23)
• Consequence: PRPS1 NM_002764.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 7.48
• Publications: 10 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: Labcorp Genetics (formerly Invitae), G2P, Orphanet
• Charcot-Marie-Tooth disease X-linked recessive 5

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

  Inheritance: XL Classification: DEFINITIVE Submitted by: G2P
• phosphoribosylpyrophosphate synthetase superactivity

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

  Inheritance: XL Classification: DEFINITIVE Submitted by: Illumina, ClinGen
• 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

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_002764.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-107640956-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 245839.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.812
• PP5: Variant X-107640957-C-G is Pathogenic according to our data. Variant chrX-107640957-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 100767.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002764.4. 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
	PRPS1	NM_002764.4	MANE Select	c.362C>G	p.Ala121Gly	missense	Exon 3 of 7	NP_002755.1	P60891-1
	PRPS1	NM_001204402.2		c.-82-4220C>G		intron	N/A	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.362C>G	p.Ala121Gly	missense	Exon 3 of 7	ENSP00000361512.4	P60891-1
	PRPS1	ENST00000643795.2		c.362C>G	p.Ala121Gly	missense	Exon 3 of 7	ENSP00000496286.1	A0A2R8Y7H4
	PRPS1	ENST00000372419.3	TSL:2	c.362C>G	p.Ala121Gly	missense	Exon 3 of 3	ENSP00000361496.3	B1ALA7

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Charcot-Marie-Tooth disease X-linked recessive 5 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D
M_CAP	Pathogenic	0.85	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Pathogenic	0.95	D
MutationAssessor	Pathogenic	4.2	H
PhyloP100		7.5
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-3.4	D
REVEL	Pathogenic	0.71
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.88	P
Vest4		0.59
MutPred		0.47		Loss of sheet (P = 0.1501)
MVP		0.98
MPC		2.1
ClinPred		1.0	D
GERP RS		3.9
Varity_R		0.98
gMVP		0.99
Mutation Taster		=4/96	disease causing (ClinVar)

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: rs587777150; hg19: chrX-106884187;