12-102852815-G-C

Position:

• chr12-102852815-G-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The ENST00000553106.6(PAH):​c.842C>G​(p.Pro281Arg) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P281L) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PAH ENST00000553106.6 missense, splice_region
• Scores: Splicing: ADA: 0.8497
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 10.0

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 12 ACMG points.

• PM1: In a hotspot region, there are 14 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 6 uncertain in ENST00000553106.6
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-102852815-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 589.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 12-102852815-G-C is Pathogenic according to our data. Variant chr12-102852815-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 1458269.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr12-102852815-G-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PAH	NM_000277.3	c.842C>G	p.Pro281Arg	missense_variant, splice_region_variant	7/13	ENST00000553106.6	NP_000268.1
PAH	NM_001354304.2	c.842C>G	p.Pro281Arg	missense_variant, splice_region_variant	8/14		NP_001341233.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PAH	ENST00000553106.6	c.842C>G	p.Pro281Arg	missense_variant, splice_region_variant	7/13	1	NM_000277.3	ENSP00000448059	P1
PAH	ENST00000307000.7	c.827C>G	p.Pro276Arg	missense_variant, splice_region_variant	8/14	5		ENSP00000303500
PAH	ENST00000635477.1	c.5C>G	p.Pro2Arg	missense_variant, splice_region_variant	1/6	5		ENSP00000489230
PAH	ENST00000549247.6	n.601C>G		splice_region_variant, non_coding_transcript_exon_variant	1/6	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Phenylketonuria Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 14, 2022

This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 281 of the PAH protein (p.Pro281Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with hyperphenylalaninemia (PMID: 12409276, 21147011, 27264808). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). Experimental studies have shown that this missense change affects PAH function (PMID: 9450897). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.95
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Pathogenic	0.62	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.92	D
MutationAssessor	Pathogenic	4.9	H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.85	D
PROVEAN	Pathogenic	-8.6	D;D
REVEL	Pathogenic	0.99
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.018	D;D
Polyphen		1.0	D;.
Vest4		0.98
MutPred		0.98		Loss of glycosylation at T278 (P = 0.0335);.;
MVP		1.0
MPC		0.25
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.85
dbscSNV1_RF	Benign	0.45
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-103246593;