rs137852636

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1PM2PP3PP5_Very_Strong

The NM_005518.4(HMGCS2):c.520T>C(p.Phe174Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000868 in 1,613,688 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 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

HMGCS2
NM_005518.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 8.76

Variant links:

Genes affected

HMGCS2 (HGNC:5008): (3-hydroxy-3-methylglutaryl-CoA synthase 2) The protein encoded by this gene belongs to the HMG-CoA synthase family. It is a mitochondrial enzyme that catalyzes the first reaction of ketogenesis, a metabolic pathway that provides lipid-derived energy for various organs during times of carbohydrate deprivation, such as fasting. Mutations in this gene are associated with HMG-CoA synthase deficiency. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

HMGCS2 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 13 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_005518.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.751

PP5

Variant 1-119764211-A-G is Pathogenic according to our data. Variant chr1-119764211-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 9257.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-119764211-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HMGCS2	NM_005518.4 link	c.520T>C	p.Phe174Leu	missense_variant	Exon 2 of 10	ENST00000369406.8	NP_005509.1	P54868-1A0A140VJL2
HMGCS2	NM_001166107.1 link	c.520T>C	p.Phe174Leu	missense_variant	Exon 2 of 9		NP_001159579.1	P54868-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
HMGCS2	ENST00000369406.8 link	c.520T>C	p.Phe174Leu	missense_variant	Exon 2 of 10	1	NM_005518.4	ENSP00000358414.3	P54868-1
HMGCS2	ENST00000544913.2 link	c.520T>C	p.Phe174Leu	missense_variant	Exon 2 of 9	2		ENSP00000439495.2	P54868-2
HMGCS2	ENST00000476640.1 link	n.416T>C		non_coding_transcript_exon_variant	Exon 1 of 4	3

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152180

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:

0.000962

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000104

AC:

AN:

251170

Hom.:

AF XY:

0.0000737

AC XY:

AN XY:

135728

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00141

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:

0.00000616

AC:

AN:

1461508

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727056

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000227

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:

0.0000329

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000962

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000642

ExAC

AF:

0.000123

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

3-hydroxy-3-methylglutaryl-CoA synthase deficiency

Pathogenic:3

Mar 01, 2001

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 10, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is present in population databases (rs137852636, gnomAD 0.1%). This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 174 of the HMGCS2 protein (p.Phe174Leu). This missense change has been observed in individual(s) with HMG-CoA synthase-2 deficiency (PMID: 11228257, 23751782, 25511235, 33045405). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects HMGCS2 function (PMID: 11228257, 23751782). 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 not expected to disrupt HMGCS2 protein function. ClinVar contains an entry for this variant (Variation ID: 9257). -

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2_Supporting+PS3+PM3+PP4 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.76

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Pathogenic

0.35

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.83

D;.

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.62

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.97

D;D

M_CAP

Uncertain

0.090

MetaRNN

Pathogenic

0.75

D;D

MetaSVM

Uncertain

0.46

MutationAssessor

Benign

1.7

L;L

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-4.5

D;D

REVEL

Pathogenic

0.86

Sift

Benign

0.14

T;T

Sift4G

Benign

0.15

T;T

Polyphen

0.90

P;.

Vest4

0.92

MutPred

0.91

Loss of catalytic residue at F174 (P = 0.1428);Loss of catalytic residue at F174 (P = 0.1428);

MVP

0.95

MPC

0.55

ClinPred

0.29

GERP RS

5.0

Varity_R

0.88

gMVP

0.85

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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