rs62508695

Positions:

• chr12-102894875-C-G
• chr12-102894875-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PM5 PP3 PP5_Moderate

The NM_000277.3(PAH):​c.212G>C​(p.Arg71Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R71H) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PAH NM_000277.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.36

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-102894875-C-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.84
• PP5: Variant 12-102894875-C-G is Pathogenic according to our data. Variant chr12-102894875-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1480944.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PAH	NM_000277.3	c.212G>C	p.Arg71Pro	missense_variant	3/13	ENST00000553106.6	NP_000268.1
PAH	NM_001354304.2	c.212G>C	p.Arg71Pro	missense_variant	4/14		NP_001341233.1
PAH	XM_017019370.2	c.212G>C	p.Arg71Pro	missense_variant	3/7		XP_016874859.1
LOC124902999	XR_007063428.1	n.863-9823C>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PAH	ENST00000553106.6	c.212G>C	p.Arg71Pro	missense_variant	3/13	1	NM_000277.3	ENSP00000448059.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Phenylketonuria Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 13, 2022

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Arg71 amino acid residue in PAH. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 10495930, 29390883). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt PAH protein function. ClinVar contains an entry for this variant (Variation ID: 1480944). This missense change has been observed in individual(s) with clinical features of PAH-related conditions (PMID: 32668217; BIOPKU http://www.biopku.org). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 71 of the PAH protein (p.Arg71Pro). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.91	D;D;D;D
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Pathogenic	0.48	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Benign	1.8	L;.;.;.
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-2.6	D;D;D;D
REVEL	Pathogenic	0.74
Sift	Benign	0.067	T;T;T;D
Sift4G	Benign	0.069	T;T;D;.
Polyphen		0.82	P;.;.;.
Vest4		0.72
MutPred		0.59		Gain of glycosylation at R71 (P = 0.0225);.;Gain of glycosylation at R71 (P = 0.0225);Gain of glycosylation at R71 (P = 0.0225);
MVP		0.99
MPC		0.14
ClinPred		0.98	D
GERP RS		4.2
Varity_R		0.85
gMVP		0.85

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-103288653;