NM_000031.6:c.36C>G

Variant names:

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).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000085 ( 0 hom. )

Consequence

ALAD
NM_000031.6 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:1

Conservation

PhyloP100: 3.88

Variant links:

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]

ALAD links:

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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: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALAD	NM_000031.6 link	c.36C>G	p.Phe12Leu	missense_variant	Exon 2 of 12	ENST00000409155.8	NP_000022.3	P13716-1A0A140VJL9Q6ZMU0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ALAD	ENST00000409155.8 link	c.36C>G	p.Phe12Leu	missense_variant	Exon 2 of 12	1	NM_000031.6	ENSP00000386284.3		P13716-1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000279

AC:

AN:

251014

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135840

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000441

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.0000848

AC:

124

AN:

1461640

Hom.:

Cov.:

AF XY:

0.0000715

AC XY:

AN XY:

727092

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000109

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74378

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000330

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

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

May 25, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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). -

Aug 11, 2023

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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

Jan 01, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.89

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.31

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.74

D;D;T

Eigen

Benign

0.12

Eigen_PC

Benign

0.20

FATHMM_MKL

Uncertain

0.96

LIST_S2

Pathogenic

0.99

D;D;D

M_CAP

Uncertain

0.15

MetaRNN

Uncertain

0.65

D;D;D

MetaSVM

Uncertain

0.19

MutationAssessor

Uncertain

2.8

M;.;.

PrimateAI

Uncertain

0.68

PROVEAN

Uncertain

-2.8

D;D;D

REVEL

Pathogenic

0.66

Sift

Benign

0.69

T;T;T

Sift4G

Benign

0.66

T;.;.

Polyphen

0.025

B;.;.

Vest4

0.82

MutPred

0.48

Gain of helix (P = 0.0117);.;.;

MVP

0.90

MPC

0.77

ClinPred

0.85

GERP RS

3.8

Varity_R

0.34

gMVP

0.76

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over