rs199475567

Positions:

• chr12-102912791-C-A
• chr12-102912791-C-T

Variant summary

Our verdict is Pathogenic. Variant got 6 ACMG points: 6P and 0B. PM3 PM2 PP4_Moderate

This summary comes from the ClinGen Evidence Repository: The c.168G>T (p.Glu56Asp) variant in PAH has been reported in multiple individuals with mild and classic PKU (BH4 deficiency excluded) (PMID:21147011, 23932990, 30050108). This variant is absent in population databases. This variant was detected with multiple pathogenic variants: R243Q (PMID:8019568); R408W and T356X (PMID:21147011); p.V399V, c.442-1G>A, p.I65T, p.R261Q (PMID:30050108). Computational prediction tools and conservation analysis do not agree on the impact to the protein. In summary, this variant meets criteria to be classified as pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM3_very-strong, PM2, PP4_Moderate. LINK:https://erepo.genome.network/evrepo/ui/classification/CA229459/MONDO:0009861/006

• Frequency: Genomes: not found (cov: 32)
• Consequence: PAH NM_000277.3 missense, splice_region
• Scores: Splicing: ADA: 0.9997
• Clinical Significance: Pathogenic reviewed by expert panel P:2 O:1
• Conservation: PhyloP100: 2.59

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 Pathogenic. Variant got 6 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PAH	NM_000277.3	c.168G>T	p.Glu56Asp	missense_variant, splice_region_variant	2/13	ENST00000553106.6
PAH	NM_001354304.2	c.168G>T	p.Glu56Asp	missense_variant, splice_region_variant	3/14
PAH	XM_017019370.2	c.168G>T	p.Glu56Asp	missense_variant, splice_region_variant	2/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PAH	ENST00000553106.6	c.168G>T	p.Glu56Asp	missense_variant, splice_region_variant	2/13	1	NM_000277.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: 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	Invitae	Feb 01, 2023	For these reasons, this variant has been classified as Pathogenic. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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 tolerated. ClinVar contains an entry for this variant (Variation ID: 102610). This missense change has been observed in individual(s) with phenylketonuria (PMID: 32668217). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 56 of the PAH protein (p.Glu56Asp). This variant also falls at the last nucleotide of exon 2, which is part of the consensus splice site for this exon. -
Pathogenic, reviewed by expert panel	curation	ClinGen PAH Variant Curation Expert Panel	Jun 29, 2020	The c.168G>T (p.Glu56Asp) variant in PAH has been reported in multiple individuals with mild and classic PKU (BH4 deficiency excluded) (PMID: 21147011, 23932990, 30050108). This variant is absent in population databases. This variant was detected with multiple pathogenic variants: R243Q (PMID: 8019568); R408W and T356X (PMID: 21147011); p.V399V, c.442-1G>A, p.I65T, p.R261Q (PMID: 30050108). Computational prediction tools and conservation analysis do not agree on the impact to the protein. In summary, this variant meets criteria to be classified as pathogenic for PAH. PAH-specific ACMG/AMP criteria applied: PM3_very-strong, PM2, PP4_Moderate. -

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	0.75
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.88	D;D;D;D
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.075
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Uncertain	0.92	D;D;D;T
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Uncertain	0.71	D
MutationAssessor	Benign	1.8	L;.;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.9	N;N;N;N
REVEL	Uncertain	0.63
Sift	Benign	0.044	D;T;T;D
Sift4G	Benign	0.11	T;T;T;.
Polyphen		0.0	B;.;.;.
Vest4		0.72
MutPred		0.78		Gain of catalytic residue at N61 (P = 0.1479);.;Gain of catalytic residue at N61 (P = 0.1479);Gain of catalytic residue at N61 (P = 0.1479);
MVP		0.94
MPC		0.029
ClinPred		0.67	D
GERP RS		2.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.74
gMVP		0.72

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		0.94		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.94		Position offset: 0

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs199475567; hg19: chr12-103306569;