NM_000317.3:c.200C>T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM1PM2PP3_ModeratePP5_Very_Strong

The NM_000317.3(PTS):c.200C>T(p.Thr67Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000497 in 1,610,406 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000053 ( 0 hom. )

Consequence

PTS
NM_000317.3 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:12

Conservation

PhyloP100: 6.38

Variant links:

Genes affected

PTS (HGNC:9689): (6-pyruvoyltetrahydropterin synthase) The enzyme encoded by this gene catalyzes the elimination of inorganic triphosphate from dihydroneopterin triphosphate, which is the second and irreversible step in the biosynthesis of tetrahydrobiopterin from GTP. Tetrahydrobiopterin, also known as BH(4), is an essential cofactor and regulator of various enzyme activities, including enzymes involved in serotonin biosynthesis and NO synthase activity. Mutations in this gene result in hyperphenylalaninemia. [provided by RefSeq, Oct 2008]

PTS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM1

In a chain 6-pyruvoyl tetrahydrobiopterin synthase (size 144) in uniprot entity PTPS_HUMAN there are 10 pathogenic changes around while only 0 benign (100%) in NM_000317.3

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.926

PP5

Variant 11-112230639-C-T is Pathogenic according to our data. Variant chr11-112230639-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 463151.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-112230639-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTS	NM_000317.3 link	c.200C>T	p.Thr67Met	missense_variant	Exon 4 of 6	ENST00000280362.8	NP_000308.1	Q03393

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTS	ENST00000280362.8 link	c.200C>T	p.Thr67Met	missense_variant	Exon 4 of 6	1	NM_000317.3	ENSP00000280362.3		Q03393

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000944

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000676

AC:

AN:

251424

Hom.:

AF XY:

0.0000736

AC XY:

AN XY:

135892

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000231

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000535

AC:

AN:

1458268

Hom.:

Cov.:

AF XY:

0.0000648

AC XY:

AN XY:

725706

show subpopulations

Gnomad4 AFR exome

AF:

0.000150

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.000187

Gnomad4 NFE exome

AF:

0.0000469

Gnomad4 OTH exome

AF:

0.0000332

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000944

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000464

Hom.:

Bravo

AF:

0.0000264

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000741

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:12

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

6-Pyruvoyl-tetrahydrobiopterin synthase deficiency

Pathogenic:10

Mar 30, 2024

Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A heterozygous missense variation in exon 4 of the PTS gene that results in the amino acid substitution of Methionine for Threonine at codon 67 was detected. The observed variant c.200C>T (p.Thr67Met) has not been found in 1000 genomes database and has a minor allele frequency of 0.05% and 0.0026% in the gnomAD and Topmed databases. The in silico prediction of the variant is pathogenic by FATHMM, SIFT, Revel and MutationTaster. The reference codon is conserved across species. In summary, the variant meets our criteria to be classified as a pathogenic. -

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The PTS c.200C>T; p.Thr67Met variant has previously been reported in the homozygous and compound heterozygous state in several individuals affected with hyperphenylalaninemia (Oppliger T et. al.; Dudesek A et. al.). Experimental studies have shown that this missense change reduces PTS enzymatic activity (Oppliger T et. al.; Dudesek A et. al.). The p.Thr67Met variant is novel (not in any individuals) in 1000 Genomes and has a frequency of 0.007% in the gnomAD database. This variant has been reported to the ClinVar database as Pathogenic. The amino acid Thr at position 67 is changed to a Met changing protein sequence and it might alter its composition and physico-chemical properties. The variant is predicted to be damaging by both SIFT and PolyPhen2. The residue is conserved across species. The amino acid change p.Thr67Met in PTS is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Pathogenic -

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 67 of the PTS protein (p.Thr67Met). This variant is present in population databases (rs370340361, gnomAD 0.02%). This missense change has been observed in individual(s) with hyperphenylalaninemia (PMID: 9222757, 11388593, 11438997, 11694255, 16850690, 22237589, 25758715). ClinVar contains an entry for this variant (Variation ID: 463151). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Experimental studies have shown that this missense change affects PTS function (PMID: 9222757, 11388593). For these reasons, this variant has been classified as Pathogenic. -

Mar 17, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Aug 15, 2017

Counsyl

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Dec 23, 2021

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jul 13, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 26, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 19, 2022

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PTS c.200C>T (p.Thr67Met) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 6.8e-05 in 251424 control chromosomes. This frequency is not significantly higher than expected for a pathogenic variant in PTS causing 6-Pyruvoyl-Tetrahydropterin Synthase Deficiency (6.8e-05 vs 0.0011), allowing no conclusion about variant significance. c.200C>T has been reported in the literature in multiple individuals affected with 6-Pyruvoyl-Tetrahydropterin Synthase Deficiency (ie. Oppliger_1997, Cordeiro_2018, Almannai_2019, etc). PTPS activity in homozygous patients fibroblasts was <10% that of wild-type (Oppliger_1997). Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Oct 11, 2024

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.5, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with hyperphenylalaninemia, BH4-deficient, A, (MIM#261640). (I) 0106 - This gene is associated with autosomal recessive disease. (I) 0200 - Variant is predicted to result in a missense amino acid change from threonine to methionine. (I) 0251 - This variant is heterozygous. (I) 0304 - Variant is present in gnomAD (v4) <0.01 for a recessive condition (80 heterozygotes, 0 homozygotes). (SP) 0501 - Missense variant consistently predicted to be damaging by multiple in silico tools or highly conserved with a major amino acid change. (SP) 0600 - Variant is located in the annotated 6-pyruvoyl tetrahydropterin synthase (DECIPHER). (I) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been classified as pathogenic by multiple clinical laboratories and has been reported in homozygous and compound heterozygous individuals with BH4 deficiency or hyperphenylalaninemia (PMIDs: 32651154, 32905092). (SP) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

not provided

Pathogenic:2

Jul 07, 2021

Genetics and Genomic Medicine Centre, NeuroGen Healthcare, NeuroGen Healthcare

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 30, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Western blot analysis of fibroblasts from a patient who was compound heterozygous for T67M and a second missense variant demonstrate no PTPS protein (Oppliger et al., 1997); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25758715, 16917893, 22237589, 16850690, 9222757, 25087612, 11388593, 25525159, 19830588, 10585341, 20059486, 9222755, 11694255, 11438997, 25456745, 30275481, 31589614, 32905092, 30109838, 32651154, 33234470, 36004034, 33101986, 32778825, 33977029, 30926181, 34214291, 35098520, 32202960) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.30

BayesDel_addAF

Pathogenic

0.37

BayesDel_noAF

Pathogenic

0.51

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.98

Eigen

Pathogenic

0.87

Eigen_PC

Pathogenic

0.82

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

M_CAP

Pathogenic

0.58

MetaRNN

Pathogenic

0.93

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.3

PrimateAI

Uncertain

0.54

PROVEAN

Pathogenic

-5.6

REVEL

Pathogenic

0.94

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0010

Polyphen

1.0

Vest4

0.62

MVP

1.0

MPC

1.0

ClinPred

0.79

GERP RS

5.4

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.0

Varity_R

0.83

gMVP

0.83

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over