rs1555198513

chr11-112233546-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000317.3(PTS):c.429A>C(p.Lys143Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTS NM_000317.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.254

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain 6-pyruvoyl tetrahydrobiopterin synthase (size 144) in uniprot entity PTPS_HUMAN there are 57 pathogenic changes around while only 2 benign (97%) in NM_000317.3
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTS	NM_000317.3	c.429A>C	p.Lys143Asn	missense_variant	6/6	ENST00000280362.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTS	ENST00000280362.8	c.429A>C	p.Lys143Asn	missense_variant	6/6	1	NM_000317.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

6-Pyruvoyl-tetrahydrobiopterin synthase deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Nov 10, 2016

This sequence change replaces lysine with asparagine at codon 143 of the PTS protein (p.Lys143Asn). The lysine residue is moderately conserved and there is a moderate physicochemical difference between lysine and asparagine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a PTS-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive, but these predictions have not been confirmed by published functional studies. In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.50
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
Cadd	Benign	22
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.88	D;D
Eigen	Benign	-0.086
Eigen_PC	Benign	-0.079
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Pathogenic	0.60	D
MetaRNN	Uncertain	0.54	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Benign	1.8	L;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-2.4	N;N
REVEL	Uncertain	0.60
Sift	Uncertain	0.010	D;D
Sift4G	Uncertain	0.019	D;D
Polyphen		0.82	P;.
Vest4		0.17
MutPred		0.53		Loss of methylation at K143 (P = 0.0051);.;
MVP		0.98
MPC		0.91
ClinPred		0.90	D
GERP RS		2.4
Varity_R		0.70
gMVP		0.78

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

Other links and lift over

dbSNP: rs1555198513; hg19: chr11-112104269;