X-134475197-C-T

Variant names:

• chrX-134475197-C-T
• rs137852494
• NM_000194.3:c.151C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000194.3(HPRT1):​c.151C>T​(p.Arg51*) variant causes a stop gained 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 (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 0.0 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: HPRT1 NM_000194.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6 U:1 O:1
• Conservation: PhyloP100: 3.75
• Publications: 19 publications found

Genes affected

HPRT1 (HGNC:5157): (hypoxanthine phosphoribosyltransferase 1) The protein encoded by this gene is a transferase, which catalyzes conversion of hypoxanthine to inosine monophosphate and guanine to guanosine monophosphate via transfer of the 5-phosphoribosyl group from 5-phosphoribosyl 1-pyrophosphate. This enzyme plays a central role in the generation of purine nucleotides through the purine salvage pathway. Mutations in this gene result in Lesch-Nyhan syndrome or gout.[provided by RefSeq, Jun 2009]

HPRT1 Gene-Disease associations (from GenCC):

• Lesch-Nyhan syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• hypoxanthine guanine phosphoribosyltransferase partial deficiency

  Inheritance: XL Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-134475197-C-T is Pathogenic according to our data. Variant chrX-134475197-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 10060.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000194.3. 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
	HPRT1	NM_000194.3	MANE Select	c.151C>T	p.Arg51*	stop_gained	Exon 3 of 9	NP_000185.1	A0A140VJL3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HPRT1	ENST00000298556.8	TSL:1 MANE Select	c.151C>T	p.Arg51*	stop_gained	Exon 3 of 9	ENSP00000298556.7	P00492
	HPRT1	ENST00000969780.1		c.196C>T	p.Arg66*	stop_gained	Exon 4 of 10	ENSP00000639839.1
	HPRT1	ENST00000969779.1		c.151C>T	p.Arg51*	stop_gained	Exon 3 of 10	ENSP00000639838.1

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1090652 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 356590

African (AFR) AF: 0.00 AC: 0 AN: 26241

American (AMR) AF: 0.00 AC: 0 AN: 35200

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19329

East Asian (EAS) AF: 0.00 AC: 0 AN: 30178

South Asian (SAS) AF: 0.00 AC: 0 AN: 53978

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40514

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4106

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 835257

Other (OTH) AF: 0.00 AC: 0 AN: 45849

GnomAD4 genome Cov.: 22

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Lesch-Nyhan syndrome (3)
2	-	-	not provided (2)
1	-	-	Lesch-Nyhan syndrome;C0268117:Partial hypoxanthine-guanine phosphoribosyltransferase deficiency (1)
-	1	-	Microcephaly (1)
-	-	-	HPRT FUJIMI (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	36
DANN	Uncertain	1.0
FATHMM_MKL	Uncertain	0.89	D
PhyloP100		3.7
Vest4		0.97
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=1/199	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: rs137852494; hg19: chrX-133609227;