Genetic Variant IVD:p.Gln136His (chr15-40410749-G-C) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_002225.5(IVD):c.408G>C(p.Gln136His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000291 in 1,614,212 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00019 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

IVD
NM_002225.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.88

Variant links:

Genes affected

IVD (HGNC:6186): (isovaleryl-CoA dehydrogenase) Isovaleryl-CoA dehydrogenase (IVD) is a mitochondrial matrix enzyme that catalyzes the third step in leucine catabolism. The genetic deficiency of IVD results in an accumulation of isovaleric acid, which is toxic to the central nervous system and leads to isovaleric acidemia. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2017]

IVD links:

Genome browser will be placed here

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;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.776

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IVD	NM_002225.5 link	c.408G>C	p.Gln136His	missense_variant	Exon 4 of 12	ENST00000487418.8	NP_002216.3	P26440A0A0A0MT83

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IVD	ENST00000487418.8 link	c.408G>C	p.Gln136His	missense_variant	Exon 4 of 12	1	NM_002225.5	ENSP00000418397.3		A0A0A0MT83

Frequencies

GnomAD3 genomes

AF:

0.000191

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000627

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:

0.00

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.0000278

AC:

AN:

251450

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135910

show subpopulations

Gnomad AFR exome

AF:

0.000431

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000123

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.000538

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000190

AC:

AN:

152320

Hom.:

Cov.:

AF XY:

0.000201

AC XY:

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.000625

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:

0.00

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.000204

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Isovaleryl-CoA dehydrogenase deficiency

Uncertain:2

Sep 08, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamine with histidine at codon 139 of the IVD protein (p.Gln139His). The glutamine residue is highly conserved and there is a small physicochemical difference between glutamine and histidine. This variant is present in population databases (rs569537063, ExAC 0.04%). This variant has not been reported in the literature in individuals affected with IVD-related conditions. ClinVar contains an entry for this variant (Variation ID: 459928). 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: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). 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. -

Jun 19, 2018

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Inborn genetic diseases

Uncertain:1

Aug 12, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.417G>C (p.Q139H) alteration is located in exon 4 (coding exon 4) of the IVD gene. This alteration results from a G to C substitution at nucleotide position 417, causing the glutamine (Q) at amino acid position 139 to be replaced by a histidine (H). 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

Pathogenic

0.87

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Pathogenic

0.38

CADD

Benign

DANN

Uncertain

1.0

Eigen

Benign

0.080

Eigen_PC

Benign

0.095

FATHMM_MKL

Uncertain

0.96

LIST_S2

Pathogenic

0.99

.;D;D;D

M_CAP

Uncertain

0.13

MetaRNN

Pathogenic

0.78

D;D;D;D

MetaSVM

Benign

-0.87

PrimateAI

Uncertain

0.63

PROVEAN

Pathogenic

-4.7

.;D;D;D

REVEL

Pathogenic

0.80

Sift

Pathogenic

0.0

.;D;D;D

Sift4G

Uncertain

0.020

D;T;T;D

Vest4

0.81, 0.76

MVP

0.95

MPC

0.56

ClinPred

0.55

GERP RS

1.9

Varity_R

0.80

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