1-119768772-G-C

Position:

chr1-119768772-G-C

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The ENST00000369406.8(HMGCS2):c.73C>G(p.Pro25Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000252 in 1,613,996 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P25S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

HMGCS2
ENST00000369406.8 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 2.76

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 Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.042060733).

BP6

Variant 1-119768772-G-C is Benign according to our data. Variant chr1-119768772-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 203778.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HMGCS2	NM_005518.4 linkuse as main transcript	c.73C>G	p.Pro25Ala	missense_variant	1/10	ENST00000369406.8	NP_005509.1
HMGCS2	NM_001166107.1 linkuse as main transcript	c.73C>G	p.Pro25Ala	missense_variant	1/9		NP_001159579.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HMGCS2	ENST00000369406.8 linkuse as main transcript	c.73C>G	p.Pro25Ala	missense_variant	1/10	1	NM_005518.4	ENSP00000358414	P1	P54868-1
HMGCS2	ENST00000544913.2 linkuse as main transcript	c.73C>G	p.Pro25Ala	missense_variant	1/9	2		ENSP00000439495		P54868-2

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000377

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000220

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000334

AC:

AN:

251122

Hom.:

AF XY:

0.000361

AC XY:

AN XY:

135720

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.0000993

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00116

Gnomad NFE exome

AF:

0.000450

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000263

AC:

385

AN:

1461706

Hom.:

Cov.:

AF XY:

0.000259

AC XY:

188

AN XY:

727162

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000157

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00109

Gnomad4 NFE exome

AF:

0.000273

Gnomad4 OTH exome

AF:

0.000282

GnomAD4 genome

AF:

0.000144

AC:

AN:

152290

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74472

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000377

Gnomad4 NFE

AF:

0.000221

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000189

Hom.:

Bravo

AF:

0.000174

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000371

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000296

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

3-hydroxy-3-methylglutaryl-CoA synthase deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 01, 2021

This sequence change replaces proline with alanine at codon 25 of the HMGCS2 protein (p.Pro25Ala). The proline residue is moderately conserved and there is a small physicochemical difference between proline and alanine. This variant is present in population databases (rs144744634, ExAC 0.08%). This variant has not been reported in the literature in individuals affected with HMGCS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 203778). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Nov 01, 2013

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.055

BayesDel_addAF

Benign

-0.26

BayesDel_noAF

Benign

-0.28

CADD

Benign

DANN

Benign

0.83

DEOGEN2

Benign

0.19

T;.

Eigen

Benign

-0.67

Eigen_PC

Benign

-0.63

FATHMM_MKL

Benign

0.30

LIST_S2

Benign

0.57

T;T

M_CAP

Benign

0.0098

MetaRNN

Benign

0.042

T;T

MetaSVM

Benign

-0.78

MutationAssessor

Benign

0.0

N;N

MutationTaster

Benign

1.0

N;N

PrimateAI

Benign

0.38

PROVEAN

Benign

-0.37

N;N

REVEL

Benign

0.13

Sift

Benign

0.11

T;T

Sift4G

Benign

0.92

T;T

Polyphen

0.0030

B;.

Vest4

0.22

MVP

0.89

MPC

0.098

ClinPred

0.023

GERP RS

2.3

Varity_R

0.048

gMVP

0.54

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