NM_000277.3:c.814G>T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1PM2PP4

This summary comes from the ClinGen Evidence Repository: PAH-specific ACMG/AMP criteria applied: PM2: Absent from 1000G, ESP. Extrememly low frequency in ExAC, gnomAD (MAF= 0.00006, 0.0003093); PVS1: Nonsense variant. Predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay.; PP4: G272X found on one allele of a patient with classic PKU (PMID:1975559). In summary this variant meets criteria to be classified as pathogenic for phenylketonuria in an autosomal recessive manner based on the ACMG/AMP criteria applied as specified by the PAH Expert Panel: (PM2, PVS1, PP4). LINK:https://erepo.genome.network/evrepo/ui/classification/CA251532/MONDO:0009861/006

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000052 ( 0 hom. )

Consequence

PAH
NM_000277.3 stop_gained

Scores

Clinical Significance

Pathogenic reviewed by expert panel P:18O:1

Conservation

PhyloP100: 0.394

Variant links:

Genes affected

PAH (HGNC:8582): (phenylalanine hydroxylase) This gene encodes a member of the biopterin-dependent aromatic amino acid hydroxylase protein family. The encoded phenylalanine hydroxylase enzyme hydroxylates phenylalanine to tyrosine and is the rate-limiting step in phenylalanine catabolism. Deficiency of this enzyme activity results in the autosomal recessive disorder phenylketonuria. [provided by RefSeq, Aug 2017]

PAH links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PVS1

For more information check the summary or visit ClinGen Evidence Repository.

PM2

For more information check the summary or visit ClinGen Evidence Repository.

PP4

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PAH	NM_000277.3 link	c.814G>T	p.Gly272*	stop_gained	Exon 7 of 13	ENST00000553106.6	NP_000268.1	P00439A0A024RBG4
PAH	NM_001354304.2 link	c.814G>T	p.Gly272*	stop_gained	Exon 8 of 14		NP_001341233.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
PAH	ENST00000553106.6 link	c.814G>T	p.Gly272*	stop_gained	Exon 7 of 13	1	NM_000277.3	ENSP00000448059.1	P00439
PAH	ENST00000307000.7 link	c.799G>T	p.Gly267*	stop_gained	Exon 8 of 14	5		ENSP00000303500.2	J3KND8
PAH	ENST00000549247.6 link	n.573G>T		non_coding_transcript_exon_variant	Exon 1 of 6	2
PAH	ENST00000635477.1 link	c.-27G>T		upstream_gene_variant		5		ENSP00000489230.1	A0A0U1RQY4

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152096

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251358

Hom.:

AF XY:

0.0000368

AC XY:

AN XY:

135838

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000704

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000520

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.0000495

AC XY:

AN XY:

727216

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000674

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000592

AC:

AN:

152096

Hom.:

Cov.:

AF XY:

0.0000808

AC XY:

AN XY:

74294

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:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000978

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:18Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Phenylketonuria

Pathogenic:10

Jan 28, 2021

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 10, 2018

ClinGen PAH Variant Curation Expert Panel

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

PAH-specific ACMG/AMP criteria applied: PM2: Absent from 1000G, ESP. Extrememly low frequency in ExAC, gnomAD (MAF= 0.00006, 0.0003093); PVS1: Nonsense variant. Predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay.; PP4: G272X found on one allele of a patient with classic PKU (PMID:1975559). In summary this variant meets criteria to be classified as pathogenic for phenylketonuria in an autosomal recessive manner based on the ACMG/AMP criteria applied as specified by the PAH Expert Panel: (PM2, PVS1, PP4). -

Dec 09, 2019

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NM_000277.1(PAH):c.814G>T(G272*) is classified as pathogenic in the context of phenylalanine hydroxylase deficiency and is associated with the classic form of disease. Sources cited for classification include the following: PMID 1671881, 24350308, 1978553, 10471838, 1975559 and 12655550. Classification of NM_000277.1(PAH):c.814G>T(G272*) is based on the following criteria: The variant causes a premature termination codon that is expected to be targeted by nonsense-mediated mRNA decay and is reported in individuals with the relevant phenotype. Please note: this variant was assessed in the context of healthy population screening. -

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 18, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Gly272*) in the PAH gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PAH are known to be pathogenic (PMID: 1301187, 9634518). This variant is present in population databases (rs62514952, gnomAD 0.009%). This premature translational stop signal has been observed in individual(s) with PKU (PMID: 1975559, 10471838). ClinVar contains an entry for this variant (Variation ID: 596). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Mar 26, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

UNC Molecular Genetics Laboratory, University of North Carolina at Chapel Hill

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

The PAH c.814G>T (p.G272*) nonsense variant is predicted to result in premature termination of the PAH protein and/or nonsense-mediated decay. This variant has been previously reported as pathogenic in individuals with phenylketonuria (PMID: 8370573; 1975559; 1978553; 17935162; 10471838; 12655550). -

Sep 01, 1993

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 31, 2018

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PAH c.814G>T (p.Gly272X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 5.1e-05 in 277088 control chromosomes (gnomAD). This frequency is not higher than expected for a pathogenic variant in PAH causing Phenylalanine Hydroxylase Deficiency (Phenylketonuria) (5.1e-05 vs 0.0079), allowing no conclusion about variant significance. c.814G>T has been reported in the literature in multiple individuals affected with Phenylalanine Hydroxylase Deficiency (Phenylketonuria)(Jeannesson-Thivisol_2015, Aldamiz-Echevarria_2016). These data indicate that the variant is very likely to be associated with disease. The variant was found to cause a loss of enzyme activity via functional studies (Aldamiz-Echevarria_2016). Three ClinVar submissions from other clinical diagnostic laboratories (evaluation after 2014) cite the variant as "pathogenic." Based on the evidence outlined above, the variant was classified as pathogenic. -

Feb 01, 2024

Laboratory of Medical Genetics, National & Kapodistrian University of Athens

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

- -

not provided

Pathogenic:7Other:1

Sep 02, 2021

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported in multiple patients with classic PKU, and one patient with mild PKU, in the presence of a second variant; also reported in a patient with classic PKU in the homozygous state (Svensson et al., 1990; Jeannesson-Thivisol et al., 2015; Williams et al., 2015); Associated with approximately 6%-7% residual activity compared to wild-type (Ho et al., 2013); Not observed at significant frequency in large population cohorts (gnomAD); Nonsense variant predicted to result in protein truncation in a gene for which loss-of-function is a known mechanism of disease; Classified as not responsive to BH4 therapy (Zurfluh et al. 2008); This variant is associated with the following publications: (PMID: 8444221, 10471838, 17935162, 22975760, 25525159, 23532445, 1975559, 25551302, 8889583, 29555771, 29431110, 31980526, 32668217, 33101986, 8188310, 32853555, 31589614, 26666653, 33375644, 27535533) -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

May 15, 2018

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 05, 2020

Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

DeBelle Laboratory for Biochemical Genetics, MUHC/MCH RESEARCH INSTITUTE

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Apr 07, 2024

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP4, PM2_moderate, PM3, PVS1 -

PAH-related disorder

Pathogenic:1

Feb 13, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The PAH c.814G>T variant is predicted to result in premature protein termination (p.Gly272*). This variant has been reported in the homozygous state or with a second pathogenic PAH variant in many patients with phenylalanine hydroxylase deficiency (for example, see Table S3 in Hillert A et al 2020. PubMed ID: 32668217). This variant and has been reported to essentially abolish PAH enzyme activity, and patients with this variant have been reported to be non-responsive to tetrahydrobiopterin (BH4) (Zurflüh et al. 2008. PubMed ID: 17935162). (Zurflüh et al. 2008. PubMed ID: 17935162). In the homozygous state, the c.814G>T variant has been associated with classical phenylketonuria (PKU) (Ellingsen et al. 1999. PubMed ID: 10471838). The ClinGen PAH Curation Expert Panel and multiple other outside laboratories classify this variant as pathogenic (https://www.ncbi.nlm.nih.gov/clinvar/variation/596/). Nonsense variants in PAH are expected to be pathogenic. Based on these observations, we also interpret this variant as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.50

BayesDel_noAF

Pathogenic

0.60

CADD

Pathogenic

DANN

Uncertain

0.99

Eigen

Pathogenic

0.73

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Benign

0.39

Vest4

0.80

GERP RS

5.7

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.10

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