rs62508721
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong
The NM_000277.3(PAH):c.620A>G(p.Asn207Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. N207D) has been classified as Uncertain significance.
Frequency
Consequence
NM_000277.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 18 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
PAH | NM_000277.3 | c.620A>G | p.Asn207Ser | missense_variant | 6/13 | ENST00000553106.6 | |
PAH | NM_001354304.2 | c.620A>G | p.Asn207Ser | missense_variant | 7/14 | ||
PAH | XM_017019370.2 | c.620A>G | p.Asn207Ser | missense_variant | 6/7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
PAH | ENST00000553106.6 | c.620A>G | p.Asn207Ser | missense_variant | 6/13 | 1 | NM_000277.3 | P1 | |
PAH | ENST00000549111.5 | n.716A>G | non_coding_transcript_exon_variant | 6/6 | 1 | ||||
PAH | ENST00000307000.7 | c.605A>G | p.Asn202Ser | missense_variant | 7/14 | 5 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461804Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2AN XY: 727204
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Phenylketonuria Pathogenic:3Uncertain:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Mar 29, 2022 | For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Asn207 amino acid residue in PAH. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 9452061, 12554741). 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 expected to disrupt PAH protein function. ClinVar contains an entry for this variant (Variation ID: 102765). This missense change has been observed in individual(s) with hyperphenylalaninemia (PMID: 9048935, 17096675, 31332730). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 207 of the PAH protein (p.Asn207Ser). - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Jul 22, 2021 | - - |
Likely pathogenic, reviewed by expert panel | curation | ClinGen PAH Variant Curation Expert Panel | Jul 23, 2023 | The NM_000277.3:c.620A>G variant in PAH is a missense variant predicted to cause substitution of asparagine by serine at amino acid 207 (p.Asn207Ser). This variant has been detected in at least 5 unrelated individuals with PAH deficiency (PMID: 32668217, PMID: 9048935). Of these individuals, one was a compound heterozygote for the variant and a likely pathogenic variant, p.Pro281Leu, in trans (phase confirmed by parental testing) (PMID: 9048935), and four were compound heterozygotes for the variant and pathogenic variants, p.Ala300Ser, p.Ala403Val, p.Glu390Gly, p.Arg252Gln, in unknown phase (PMID: 32668217) (3pts total, PM3_Strong). One of these individuals had plasma phenylalanine >120 μmol/L without the exclusion of a defect of BH4 cofactor metabolism (PMID: 9048935) (PP4). This variant is absent in gnomAD v2.1.1 (PM2_Supporting). The computational predictor REVEL gives a score of 0.77 which is above the threshold of 0.75, evidence that correlates with impact to PAH function (PP3). There is a ClinVar entry for this variant (Variation ID: 102765, 1 star review status) with one submitter classifying the variant as pathogenic, one submitter classifying the variant as likely pathogenic, and one submitter classifying the variant as a variant of uncertain significance. In summary, this variant meets the criteria to be classified as likely pathogenic for PAH deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen PAH Variant Curation Expert Panel (Specifications Version 2.0): PM2_Supporting, PM3_Strong, PP3, PP4. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Counsyl | Aug 22, 2017 | - - |
not provided Other:1
not provided, no classification provided | literature only | DeBelle Laboratory for Biochemical Genetics, MUHC/MCH RESEARCH INSTITUTE | - | - - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at