9-113393524-G-C
Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP5
The NM_000031.6(ALAD):c.36C>G(p.Phe12Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000812 in 1,613,876 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. F12F) has been classified as Likely benign.
Frequency
Genomes: 𝑓 0.000046 ( 0 hom., cov: 31)
Exomes 𝑓: 0.000085 ( 0 hom. )
Consequence
ALAD
NM_000031.6 missense
NM_000031.6 missense
Scores
5
9
5
Clinical Significance
Conservation
PhyloP100: 3.88
Genes affected
ALAD (HGNC:395): (aminolevulinate dehydratase) The ALAD enzyme is composed of 8 identical subunits and catalyzes the condensation of 2 molecules of delta-aminolevulinate to form porphobilinogen (a precursor of heme, cytochromes and other hemoproteins). ALAD catalyzes the second step in the porphyrin and heme biosynthetic pathway; zinc is essential for enzymatic activity. ALAD enzymatic activity is inhibited by lead and a defect in the ALAD structural gene can cause increased sensitivity to lead poisoning and acute hepatic porphyria. Alternative splicing of this gene results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Dec 2015]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 3 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 9-113393524-G-C is Pathogenic according to our data. Variant chr9-113393524-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 16867.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
ALAD | NM_000031.6 | c.36C>G | p.Phe12Leu | missense_variant | 2/12 | ENST00000409155.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
ALAD | ENST00000409155.8 | c.36C>G | p.Phe12Leu | missense_variant | 2/12 | 1 | NM_000031.6 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000460 AC: 7AN: 152236Hom.: 0 Cov.: 31
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GnomAD3 exomes AF: 0.0000279 AC: 7AN: 251014Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135840
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:2Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
not provided Pathogenic:1Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | May 25, 2022 | This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 12 of the ALAD protein (p.Phe12Leu). This variant is present in population databases (rs121912984, gnomAD 0.006%). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies have shown that this missense change affects ALAD function (PMID: 10519994, 17236137). 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: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 16867). This missense change has been observed in individual(s) with ALAD-related conditions (PMID: 10519994, 16398658; Invitae). - |
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Aug 11, 2023 | Published functional studies demonstrate that the p.(F12L) variant results in ALAD protein without significant enzyme activity (Maruno et al., 2001; Akagi et al., 1999; Inoue et al., 2008; Akagi et al., 2006); Variant was identified in the heterozygous state in several individuals from the same family with ALAD deficiency (Akagi et al., 1999); This variant is associated with the following publications: (PMID: 19015748, 17236137, 16398658, 11342419, 10519994) - |
Porphyria, acute hepatic, digenic Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Jan 01, 2006 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Benign
Dann
Uncertain
DEOGEN2
Uncertain
D;D;T
Eigen
Benign
Eigen_PC
Benign
FATHMM_MKL
Uncertain
D
LIST_S2
Pathogenic
D;D;D
M_CAP
Uncertain
D
MetaRNN
Uncertain
D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
M;.;.
MutationTaster
Benign
A;A
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D;D
REVEL
Pathogenic
Sift
Benign
T;T;T
Sift4G
Benign
T;.;.
Polyphen
B;.;.
Vest4
MutPred
Gain of helix (P = 0.0117);.;.;
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at