rs556400964

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_001182.5(ALDH7A1):c.1513G>C(p.Gly505Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00013 in 1,614,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. G505G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

ALDH7A1
NM_001182.5 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.51

Variant links:

Genes affected

ALDH7A1 (HGNC:877): (aldehyde dehydrogenase 7 family member A1) The protein encoded by this gene is a member of subfamily 7 in the aldehyde dehydrogenase gene family. These enzymes are thought to play a major role in the detoxification of aldehydes generated by alcohol metabolism and lipid peroxidation. This particular member has homology to a previously described protein from the green garden pea, the 26g pea turgor protein. It is also involved in lysine catabolism that is known to occur in the mitochondrial matrix. Recent reports show that this protein is found both in the cytosol and the mitochondria, and the two forms likely arise from the use of alternative translation initiation sites. An additional variant encoding a different isoform has also been found for this gene. Mutations in this gene are associated with pyridoxine-dependent epilepsy. Several related pseudogenes have also been identified. [provided by RefSeq, Jan 2011]

ALDH7A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.939

PP5

Variant 5-126546376-C-G is Pathogenic according to our data. Variant chr5-126546376-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 204852.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-126546376-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
ALDH7A1	NM_001182.5 linkuse as main transcript	c.1513G>C	p.Gly505Arg	missense_variant	17/18	ENST00000409134.8
ALDH7A1	NM_001201377.2 linkuse as main transcript	c.1429G>C	p.Gly477Arg	missense_variant	17/18
ALDH7A1	NM_001202404.2 linkuse as main transcript	c.1321G>C	p.Gly441Arg	missense_variant	15/16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALDH7A1	ENST00000409134.8 linkuse as main transcript	c.1513G>C	p.Gly505Arg	missense_variant	17/18	1	NM_001182.5	P4	P49419-1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152186

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000875

AC:

AN:

251310

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135810

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000376

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:

0.0000616

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000140

AC:

204

AN:

1461866

Hom.:

Cov.:

AF XY:

0.000132

AC XY:

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000425

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:

0.000162

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000170

Hom.:

Bravo

AF:

0.0000793

ExAC

AF:

0.0000906

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Pyridoxine-dependent epilepsy

Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Mar 07, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 03, 2022	Variant summary: ALDH7A1 c.1513G>C (p.Gly505Arg, also reported as p.Gly477Arg) results in a non-conservative amino acid change located in the Aldehyde dehydrogenase domain (IPR015590) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8.8e-05 in 251310 control chromosomes (gnomAD). This frequency is not significantly higher than expected for a pathogenic variant in ALDH7A1 causing Pyridoxine-Dependent Epilepsy (8.8e-05 vs 0.0018), allowing no conclusion about variant significance. c.1513G>C has been reported in the literature in multiple compound heterozygous individuals affected with Pyridoxine-Dependent Epilepsy (e.g. Bennett_2009, Alfadhel_2012, Perez_2013, Kava_2020) and at least one homozygous individual (Perez_2013). These data indicate that the variant is very likely to be associated with disease. One publication using an E.coli expression system found that ALDH7A1 protein with the variant had less than 3% enzymatic activity (Coulter-Mackie_2012). Four ClinVar submitters have assessed the variant since 2014: all four classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Apr 11, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 27, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 505 of the ALDH7A1 protein (p.Gly505Arg). This variant is present in population databases (rs556400964, gnomAD 0.03%). This missense change has been observed in individual(s) with pyridoxine-dependent epilepsy (PMID: 19128417, 20554659, 20814824, 23350806, 24942048). This variant is also known as c.1429G>C, p.Gly477Arg. ClinVar contains an entry for this variant (Variation ID: 204852). 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 ALDH7A1 protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects ALDH7A1 function (PMID: 22784480). For these reasons, this variant has been classified as Pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Mar 21, 2023

Published functional studies demonstrate this variant abolishes ATQ enzyme activity (Coulter-Mackie et al., 2014); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31440721, 22784480, 19128417, 22728861, 30043187, 31980526, 32685344, 31589614, 24613284, 23350806, 20814824) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Pathogenic

0.25

BayesDel_noAF

Pathogenic

0.44

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.50

D;D;T;.;T;.;.;.

Eigen

Pathogenic

0.89

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

1.0

D;D;D;D;D;D;D;D

M_CAP

Pathogenic

0.34

MetaRNN

Pathogenic

0.94

D;D;D;D;D;D;D;D

MetaSVM

Pathogenic

1.0

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.86

Polyphen

1.0

.;D;.;.;.;.;.;.

Vest4

0.97, 0.97

MVP

0.98

MPC

0.72

ClinPred

0.99

GERP RS

4.0

Varity_R

0.99

gMVP

0.93

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