rs727503963

Positions:

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The NM_000191.3(HMGCL):c.698A>G(p.His233Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000508 in 1,613,934 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000051 ( 0 hom. )

Consequence

HMGCL
NM_000191.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10

Conservation

PhyloP100: 7.95

Variant links:

Genes affected

HMGCL (HGNC:5005): (3-hydroxy-3-methylglutaryl-CoA lyase) The protein encoded by this gene belongs to the HMG-CoA lyase family. It is a mitochondrial enzyme that catalyzes the final step of leucine degradation and plays a key role in ketone body formation. Mutations in this gene are associated with HMG-CoA lyase deficiency. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

HMGCL links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a mutagenesis_site Loss of activity, and reduced proton exchange rate. (size 0) in uniprot entity HMGCL_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.992

PP5

Variant 1-23808187-T-C is Pathogenic according to our data. Variant chr1-23808187-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 167180.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HMGCL	NM_000191.3 linkuse as main transcript	c.698A>G	p.His233Arg	missense_variant	7/9	ENST00000374490.8	NP_000182.2
HMGCL	NM_001166059.2 linkuse as main transcript	c.485A>G	p.His162Arg	missense_variant	5/7		NP_001159531.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HMGCL	ENST00000374490.8 linkuse as main transcript	c.698A>G	p.His233Arg	missense_variant	7/9	1	NM_000191.3	ENSP00000363614	P1	P35914-1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152108

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.000103

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251412

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135876

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000513

AC:

AN:

1461826

Hom.:

Cov.:

AF XY:

0.0000481

AC XY:

AN XY:

727208

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:

0.00

Gnomad4 NFE exome

AF:

0.0000638

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152108

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74312

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.000103

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000987

Hom.:

Bravo

AF:

0.0000529

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Deficiency of hydroxymethylglutaryl-CoA lyase

Pathogenic:6

Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Apr 11, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 04, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Feb 07, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 15, 2018	Variant summary: The HMGCL c.698A>G (p.His233Arg) variant involves the alteration of a conserved nucleotide that is located in the Pyruvate carboxyltransferase (InterPro) and is found in the active site required for Mg2+ binding (Fu_2006). 5/5 in silico tools predict a damaging outcome for this variant. This variant was found in 3/277164 control chromosomes at a frequency of 0.0000108, which does not exceed the estimated maximal expected allele frequency of a pathogenic HMGCL variant (0.0007071). The variant is reported in the literature as a homozygous and compound heterozygous allele in multiple patients, and functional studies show undetectable enzyme activity in the fibroblasts and lymphocytes of patients (Roberts_1996, Pospisilova_2003). In addition, one clinical diagnostic laboratory classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 27, 2023	This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 233 of the HMGCL protein (p.His233Arg). This variant is present in population databases (rs727503963, gnomAD 0.002%). This missense change has been observed in individual(s) with 3-hydroxy-3-methylglutaryl-CoA lyase deficiency (PMID: 9784232, 14518825). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 167180). 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 HMGCL protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects HMGCL function (PMID: 8798725, 16330550). For these reasons, this variant has been classified as Pathogenic. -

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 19, 2022	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); Published functional studies demonstrate a damaging effect as this variant is associated with less than 1% 3-hydroxy-3-methylglutaryl-CoA lyase activity compared to wild-type (Roberts et al., 1996); This variant is associated with the following publications: (PMID: 19177531, 16330550, 9784232, 14518825, 17692550, 15308132, 22847177, 9463337, 8798725) -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jan 23, 2014	- -

HMGCL-related disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 15, 2023

The HMGCL c.698A>G variant is predicted to result in the amino acid substitution p.His233Arg. This variant has previously been reported to be causative for HMG-CoA lyase deficiency (Pospísilová E et al 2003. PubMed ID: 14518825; Mitchell GA et al 1998. PubMed ID: 9463337; Menao S et al 2009. PubMed ID: 19177531). This variant is reported in 0.0023% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/1-24134677-T-C). This variant is interpreted as pathogenic. -

Long chain 3-hydroxyacyl-CoA dehydrogenase deficiency

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Natera, Inc.

Dec 14, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.86

BayesDel_addAF

Pathogenic

0.58

BayesDel_noAF

Pathogenic

0.60

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.99

D;.

Eigen

Pathogenic

0.76

Eigen_PC

Pathogenic

0.73

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.98

D;D

M_CAP

Pathogenic

0.44

MetaRNN

Pathogenic

0.99

D;D

MetaSVM

Pathogenic

0.81

MutationAssessor

Pathogenic

4.8

H;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-7.7

D;D

REVEL

Pathogenic

0.98

Sift

Pathogenic

0.0

D;D

Sift4G

Pathogenic

0.0

D;D

Polyphen

1.0

D;.

Vest4

0.99

MutPred

0.99

Loss of catalytic residue at C234 (P = 0.0559);.;

MVP

0.99

MPC

0.53

ClinPred

1.0

GERP RS

5.7

Varity_R

0.99

gMVP

1.0

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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