rs199475677

Positions:

chr12-102912798-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PP4_ModeratePM2PP3PM3

This summary comes from the ClinGen Evidence Repository: The c.161T>C (p.Leu54Ser) variant in PAH is a missense variant that is predicted to be deleterious in multiple lines of computational evidence. This variant was reported in a Spanish patient with mild/moderate PKU. A defect in the synthesis or regeneration pathways of 6R-BH4 was ruled out by analyzing urinary pterin levels and measuring the dihydropteridine reductase activity (PMID:27121329). This variant was detected in trans with pathogenic variant c.912+1G>A. It was found in extremely low frequency in gnomAD (MAF=0.00006). In summary, this variant meets criteria to be classified as likely pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM2, PP4 moderate, PM3, and PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA229448/MONDO:0009861/006

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

PAH
NM_000277.3 missense

Scores

Clinical Significance

Likely pathogenic reviewed by expert panel P:1U:2O:1

Conservation

PhyloP100: 3.41

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 Likely_pathogenic. Variant got 7 ACMG points.

PM2

PM3

PP3

PP4

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
PAH	NM_000277.3 linkuse as main transcript	c.161T>C	p.Leu54Ser	missense_variant	2/13	ENST00000553106.6
PAH	NM_001354304.2 linkuse as main transcript	c.161T>C	p.Leu54Ser	missense_variant	3/14
PAH	XM_017019370.2 linkuse as main transcript	c.161T>C	p.Leu54Ser	missense_variant	2/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PAH	ENST00000553106.6 linkuse as main transcript	c.161T>C	p.Leu54Ser	missense_variant	2/13	1	NM_000277.3	P1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152218

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251396

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135860

show subpopulations

Gnomad AFR exome

AF:

0.0000615

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.87e-7

AC:

AN:

1455254

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

724538

show subpopulations

Gnomad4 AFR exome

AF:

0.0000300

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152218

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1Uncertain:2Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Phenylketonuria

Pathogenic:1Uncertain:1

Likely pathogenic, reviewed by expert panel	curation	ClinGen PAH Variant Curation Expert Panel	Jul 23, 2020	The c.161T>C (p.Leu54Ser) variant in PAH is a missense variant that is predicted to be deleterious in multiple lines of computational evidence. This variant was reported in a Spanish patient with mild/moderate PKU. A defect in the synthesis or regeneration pathways of 6R-BH4 was ruled out by analyzing urinary pterin levels and measuring the dihydropteridine reductase activity (PMID: 27121329). This variant was detected in trans with pathogenic variant c.912+1G>A. It was found in extremely low frequency in gnomAD (MAF=0.00006). In summary, this variant meets criteria to be classified as likely pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM2, PP4 moderate, PM3, and PP3. -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Nov 14, 2017	- -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Apr 19, 2024

Variant summary: PAH c.161T>C (p.Leu54Ser) results in a non-conservative amino acid change located in the ACT domain (IPR002912) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 251396 control chromosomes. c.161T>C has been reported in the literature as a biallelic compound heterozygous genotye in at-least one individual with moderate Phenylketonuria (PKU) who was also non-responsive on the BH4 loading test (examle, Aldamiz-Echevarria_2016, Hillert_2020). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 27121329, 32668217). ClinVar contains an entry for this variant (Variation ID: 102602) with the ClinGen PAH Variant Curation Expert Panel classification as Likely Pathogenic citing overlapping evidence utilized in the context of this evaluation. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

not provided

Other:1

not provided, no classification provided

literature only

DeBelle Laboratory for Biochemical Genetics, MUHC/MCH RESEARCH INSTITUTE

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.45

BayesDel_addAF

Pathogenic

0.35

BayesDel_noAF

Pathogenic

0.45

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.93

D;D;D;D

Eigen

Uncertain

0.55

Eigen_PC

Uncertain

0.54

FATHMM_MKL

Uncertain

0.89

LIST_S2

Uncertain

0.94

D;D;D;D

M_CAP

Pathogenic

0.60

MetaRNN

Pathogenic

0.97

D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

1.7

L;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.56

PROVEAN

Uncertain

-3.5

D;D;D;D

REVEL

Pathogenic

0.88

Sift

Uncertain

0.0030

D;D;D;D

Sift4G

Benign

0.13

T;T;D;.

Polyphen

0.99

D;.;.;.

Vest4

0.72

MutPred

0.84

Loss of stability (P = 0.0084);.;Loss of stability (P = 0.0084);Loss of stability (P = 0.0084);

MVP

0.98

MPC

0.25

ClinPred

0.93

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.80

gMVP

0.75

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