Genetic Variant ALAS1:p.Val5Ile (chr3-52199254-G-A) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_000688.6(ALAS1):c.13G>A(p.Val5Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000158 in 1,614,040 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

ALAS1
NM_000688.6 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.60

Variant links:

Genes affected

ALAS1 (HGNC:396): (5'-aminolevulinate synthase 1) This gene encodes the mitochondrial enzyme which is catalyzes the rate-limiting step in heme (iron-protoporphyrin) biosynthesis. The enzyme encoded by this gene is the housekeeping enzyme; a separate gene encodes a form of the enzyme that is specific for erythroid tissue. The level of the mature encoded protein is regulated by heme: high levels of heme down-regulate the mature enzyme in mitochondria while low heme levels up-regulate. A pseudogene of this gene is located on chromosome 12. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jan 2015]

ALAS1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.23593172).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ALAS1	NM_000688.6 link	c.13G>A	p.Val5Ile	missense_variant	Exon 3 of 12	ENST00000484952.6	NP_000679.1	P13196-1Q5JAM2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ALAS1	ENST00000484952.6 link	c.13G>A	p.Val5Ile	missense_variant	Exon 3 of 12	1	NM_000688.6	ENSP00000418779.1	P13196-1
ALAS1	ENST00000310271.6 link	c.13G>A	p.Val5Ile	missense_variant	Exon 2 of 11	1		ENSP00000309259.2	P13196-1
ALAS1	ENST00000469224.5 link	c.13G>A	p.Val5Ile	missense_variant	Exon 2 of 11	1		ENSP00000417719.1	P13196-1
ALAS1	ENST00000394965.6 link	c.13G>A	p.Val5Ile	missense_variant	Exon 3 of 12	2		ENSP00000378416.2	P13196-1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.000162

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000119

AC:

AN:

251482

Hom.:

AF XY:

0.0000956

AC XY:

AN XY:

135914

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:

0.000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000166

AC:

243

AN:

1461888

Hom.:

Cov.:

AF XY:

0.000142

AC XY:

103

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.00

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:

0.0000936

Gnomad4 NFE exome

AF:

0.000206

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.0000789

AC:

AN:

152152

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74320

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000201

Hom.:

Bravo

AF:

0.0000529

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000173

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 08, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.13G>A (p.V5I) alteration is located in exon 3 (coding exon 1) of the ALAS1 gene. This alteration results from a G to A substitution at nucleotide position 13, causing the valine (V) at amino acid position 5 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.091

BayesDel_addAF

Benign

-0.085

BayesDel_noAF

Uncertain

-0.050

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.23

T;T;T;T

Eigen

Benign

-0.080

Eigen_PC

Benign

0.11

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.86

.;.;.;D

M_CAP

Uncertain

0.089

MetaRNN

Benign

0.24

T;T;T;T

MetaSVM

Uncertain

0.56

MutationAssessor

Benign

1.7

L;L;L;L

PrimateAI

Uncertain

0.74

PROVEAN

Benign

0.020

N;N;N;N

REVEL

Uncertain

0.31

Sift

Benign

0.26

T;T;T;T

Sift4G

Benign

0.38

T;T;T;T

Polyphen

0.0020

B;B;B;B

Vest4

0.21

MVP

0.63

MPC

0.22

ClinPred

0.13

GERP RS

4.9

Varity_R

0.091

gMVP

0.22

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