rs137852490

Positions:

• chrX-134500030-C-G
• chrX-134500030-C-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_000194.3(HPRT1):​c.610C>G​(p.His204Asp) variant causes a missense, splice region 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. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H204R) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 23)
• Consequence: HPRT1 NM_000194.3 missense, splice_region
• Scores: Splicing: ADA: 0.8365
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.22

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM1: In a chain Hypoxanthine-guanine phosphoribosyltransferase (size 216) in uniprot entity HPRT_HUMAN there are 37 pathogenic changes around while only 0 benign (100%) in NM_000194.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant X-134500030-C-G is Pathogenic according to our data. Variant chrX-134500030-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 10047.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HPRT1	NM_000194.3	c.610C>G	p.His204Asp	missense_variant, splice_region_variant	9/9	ENST00000298556.8	NP_000185.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HPRT1	ENST00000298556.8	c.610C>G	p.His204Asp	missense_variant, splice_region_variant	9/9	1	NM_000194.3	ENSP00000298556	P1
HPRT1	ENST00000475720.1	n.567+1346C>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 24

GnomAD4 genome Cov.: 23

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Lesch-Nyhan syndrome;C0268117:Partial hypoxanthine-guanine phosphoribosyltransferase deficiency Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Elsea Laboratory, Baylor College of Medicine

Apr 01, 2020

- -

Lesch-Nyhan syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jun 01, 1990

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.85	D
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	1.4	L
MutationTaster	Benign	1.0	A
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-7.1	D
REVEL	Pathogenic	0.91
Sift	Uncertain	0.018	D
Sift4G	Uncertain	0.021	D
Polyphen		0.75	P
Vest4		0.94
MutPred		0.85		Loss of helix (P = 0.1706);
MVP		1.0
MPC		3.4
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.98
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.84
dbscSNV1_RF	Benign	0.67
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

LitVar

Other links and lift over

dbSNP: rs137852490; hg19: chrX-133634060;