rs199475671

Positions:

• chr12-102855307-A-G
• chr12-102855307-A-T

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PP3 PM3_Strong PM2 PP4_Moderate

This summary comes from the ClinGen Evidence Repository: The c.535T>C (p.Tyr179His) variant in PAH has been reported in multiple individuals with PKU, including in patients with classic PKU in whom BH4 deficiency has been excluded (PMID:29997390, PMID:16256386, PMID:20920871, PMID:32668217, PMID:30389586). p.Tyr179His has been detected with multiple variants classified as likely pathogenic or pathogenic by PAH VCEP, including p.Arg176*, c.1066-11G>A, c.1199+1G>C, p.Ala403Val, p.Ile406Met, p.Arg408Trp, p.Val230Ile (PMID:32668217). This variant is absent from population databases. Multiple lines of computational evidence support a deleterious effect. In summary, this variant meets criteria to be classified as likely pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM3_Strong, PM2, PP4_Moderate, PP3. LINK:https://erepo.genome.network/evrepo/ui/classification/CA229615/MONDO:0009861/006

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: PAH NM_000277.3 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2 O:1
• Conservation: PhyloP100: 9.32

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PAH	NM_000277.3	c.535T>C	p.Tyr179His	missense_variant	6/13	ENST00000553106.6
PAH	NM_001354304.2	c.535T>C	p.Tyr179His	missense_variant	7/14
PAH	XM_017019370.2	c.535T>C	p.Tyr179His	missense_variant	6/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PAH	ENST00000553106.6	c.535T>C	p.Tyr179His	missense_variant	6/13	1	NM_000277.3	P1
PAH	ENST00000549111.5	n.631T>C		non_coding_transcript_exon_variant	6/6	1
PAH	ENST00000307000.7	c.520T>C	p.Tyr174His	missense_variant	7/14	5
PAH	ENST00000551988.5	n.556T>C		non_coding_transcript_exon_variant	5/5	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461836 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 727228

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Phenylketonuria Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Oct 08, 2021	Variant summary: PAH c.535T>C (p.Tyr179His) results in a conservative amino acid change located in the Aromatic amino acid hydroxylase, C-terminal domain (IPR019774) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251232 control chromosomes (gnomAD). c.535T>C has been reported in the literature in multiple individuals affected with Phenylalanine Hydroxylase Deficiency (Phenylketonuria) (e.g. Song_2006, Zare-Karizi_2011, Sarkissian_2012, Shirzadeh_2018). These data indicate that the variant is very likely to be associated with disease. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as pathogenic. -
Likely pathogenic, reviewed by expert panel	curation	ClinGen PAH Variant Curation Expert Panel	Dec 09, 2022	The c.535T>C (p.Tyr179His) variant in PAH has been reported in multiple individuals with PKU, including in patients with classic PKU in whom BH4 deficiency has been excluded (PMID: 29997390, PMID: 16256386, PMID: 20920871, PMID: 32668217, PMID: 30389586). p.Tyr179His has been detected with multiple variants classified as likely pathogenic or pathogenic by PAH VCEP, including p.Arg176*, c.1066-11G>A, c.1199+1G>C, p.Ala403Val, p.Ile406Met, p.Arg408Trp, p.Val230Ile (PMID: 32668217). This variant is absent from population databases. Multiple lines of computational evidence support a deleterious effect. In summary, this variant meets criteria to be classified as likely pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM3_Strong, PM2, PP4_Moderate, PP3. -

not provided Other:1

not provided, no classification provided

literature only

DeBelle Laboratory for Biochemical Genetics, MUHC/MCH RESEARCH INSTITUTE

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	1.0	D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.95
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D;D
M_CAP	Pathogenic	0.81	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Pathogenic	4.8	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-4.8	D;D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.013	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.97
MutPred		0.91		Loss of phosphorylation at Y179 (P = 0.0123);.;
MVP		0.99
MPC		0.26
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.96
gMVP		0.98

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: rs199475671; hg19: chr12-103249085;