rs148773718

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM1PP3_StrongPP5_Very_Strong

The NM_022132.5(MCCC2):c.1423G>A(p.Gly475Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000843 in 1,614,088 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000078 ( 0 hom. )

Consequence

MCCC2
NM_022132.5 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:9

Conservation

PhyloP100: 9.96

Publications

6 publications found

Variant links:

Genes affected

MCCC2 (HGNC:6937): (methylcrotonyl-CoA carboxylase subunit 2) This gene encodes the small subunit of 3-methylcrotonyl-CoA carboxylase. This enzyme functions as a heterodimer and catalyzes the carboxylation of 3-methylcrotonyl-CoA to form 3-methylglutaconyl-CoA. Mutations in this gene are associated with 3-Methylcrotonylglycinuria, an autosomal recessive disorder of leucine catabolism. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, May 2018]

MCCC2 Gene-Disease associations (from GenCC):

3-methylcrotonyl-CoA carboxylase 2 deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
3-methylcrotonyl-CoA carboxylase deficiency
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet

MCCC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 14 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_022132.5

PP3

MetaRNN computational evidence supports a deleterious effect, 0.949

PP5

Variant 5-71650118-G-A is Pathogenic according to our data. Variant chr5-71650118-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 467803.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCCC2	NM_022132.5 link	c.1423G>A	p.Gly475Arg	missense_variant	Exon 15 of 17	ENST00000340941.11	NP_071415.1	Q9HCC0-1A0A140VK29
MCCC2	NM_001363147.1 link	c.1309G>A	p.Gly437Arg	missense_variant	Exon 14 of 16		NP_001350076.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MCCC2	ENST00000340941.11 link	c.1423G>A	p.Gly475Arg	missense_variant	Exon 15 of 17	1	NM_022132.5	ENSP00000343657.6		Q9HCC0-1

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152222

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000851

Gnomad ASJ

AF:

0.000576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.0000955

AC:

AN:

251378

AF XY:

0.000110

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.000794

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000968

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000780

AC:

114

AN:

1461866

Hom.:

Cov.:

AF XY:

0.0000811

AC XY:

AN XY:

727230

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.000157

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.000612

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53416

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000782

AC:

AN:

1111994

Other (OTH)

AF:

0.0000662

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.468

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000145

AC:

AN:

152222

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74368

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41456

American (AMR)

AF:

0.000851

AC:

AN:

15272

Ashkenazi Jewish (ASJ)

AF:

0.000576

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000882

AC:

AN:

68046

Other (OTH)

AF:

0.000478

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000141

Hom.:

Bravo

AF:

0.000178

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000659

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.000237

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

3-methylcrotonyl-CoA carboxylase 2 deficiency

Pathogenic:5

May 20, 2019

Knight Diagnostic Laboratories, Oregon Health and Sciences University

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 15, 2017

Illumina Laboratory Services, Illumina

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The MCCC2 c.1423G>A (p.Gly475Arg) missense variant has been reported in two studies and in three individuals with 3-MCC deficiency, including one in a homozygous state and two in a compound heterozygous state (GrÃ¼nert et al. 2012; Fonseca et al. 2016). The three individuals were asymptomatic and identified by newborn screening. The p.Gly475Arg variant was absent from 100 controls and is reported at a frequency of 0.00079 in the Ashkenazi Jewish population of the Genome Aggregation Database. Expression of wild type and variant p.Gly475Arg in MCCC1/MCCC2 deficient fibroblasts revealed that the variant p.Gly475Arg protein is expressed at a level similar to wild type but has 43.8%-48.5% residual MCC activity compared to wild type (GrÃ¼nert et al. 2012). Based on the evidence, the p.Gly475Arg variant is classified as likely pathogenic for 3-MCC deficiency. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Jun 12, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 10, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 475 of the MCCC2 protein (p.Gly475Arg). This variant is present in population databases (rs148773718, gnomAD 0.08%). This missense change has been observed in individual(s) with clinical features of 3-methylcrotonyl-CoA carboxylase deficiency (PMID: 22642865, 27601257, 30626930; internal data). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 467803). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt MCCC2 protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects MCCC2 function (PMID: 22642865). For these reasons, this variant has been classified as Pathogenic. -

Mar 23, 2024

Baylor Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Methylcrotonyl-CoA carboxylase deficiency

Pathogenic:1

Mar 18, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: MCCC2 c.1423G>A (p.Gly475Arg) results in a non-conservative amino acid change located in the Acetyl-coenzyme A carboxyltransferase, C-terminal domain (IPR011763) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 9.5e-05 in 251378 control chromosomes (gnomAD). This frequency is not significantly higher than estimated for a pathogenic variant in MCCC2 causing Methylcrotonyl-CoA Carboxylase Deficiency (9.5e-05 vs 0.0042), allowing no conclusion about variant significance. c.1423G>A has been reported in the literature in compound heterozygous individuals and at least one homozygous individual affected with Methylcrotonyl-CoA Carboxylase Deficiency (e.g. Navarrete_2019, Barbosa-Gouveia_2021). These data indicate that the variant is likely to be associated with disease. At least one functional study showed this variant results in decreased MCC activity in transfected cells compared with WT (Grunert_2012). Five ClinVar submitters have assessed the variant since 2014: three classified the variant as likely pathogenic and two as pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Inborn genetic diseases

Pathogenic:1

May 29, 2022

Ambry Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1423G>A (p.G475R) alteration is located in exon 15 (coding exon 15) of the MCCC2 gene. This alteration results from a G to A substitution at nucleotide position 1423, causing the glycine (G) at amino acid position 475 to be replaced by an arginine (R). Based on data from gnomAD, the A allele has an overall frequency of 0.01% (27/282790) total alleles studied. The highest observed frequency was 0.08% (8/10368) of Ashkenazi Jewish alleles. This alteration has been detected in the homozygous state as well as compound heterozygous with other pathogenic MCCC2 alterations in multiple unrelated individuals with 3-methylcrotonyl-CoA carboxylase deficiency (Grunert, 2012; Fonseca, 2016; Boemer, 2017; Navarrette, 2019; Martin-Rivada, 2022). This amino acid position is highly conserved in available vertebrate species. Functional studies showed that p.G475R is not sufficient to rescue MCC deficiency in two different MCC-deficient fibroblast cell lines (Grunert, 2012). This alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as likely pathogenic. -

MCCC2-related disorder

Pathogenic:1

Feb 09, 2024

PreventionGenetics, part of Exact Sciences

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The MCCC2 c.1423G>A variant is predicted to result in the amino acid substitution p.Gly475Arg. This variant has been reported in the compound heterozygous and homozygous states in multiple individuals with MCC deficiency (Grünert et al. 2012. PubMed ID: 22642865; Fonseca et al. 2016. PubMed ID: 27601257; Navarrete et al. 2019. PubMed ID: 30626930; Barbosa-Gouveia et al. 2021. PubMed ID: 34440436). In vitro experimental studies have shown this variant leads to moderately reduced MCC activity (43.8-48.5%) relative to WT (Grünert et al. 2012. PubMed ID: 22642865). This variant is reported in 0.077% of alleles in individuals of Ashkenazi Jewish descent in gnomAD. This variant is interpreted as likely pathogenic. -

not provided

Pathogenic:1

Dec 13, 2022

GeneDx

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22642865, 27601257, 30626930, 32778825, 35281663, 34440436) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.82

BayesDel_addAF

Pathogenic

0.41

BayesDel_noAF

Pathogenic

0.60

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.95

D;.

Eigen

Pathogenic

1.2

Eigen_PC

Pathogenic

1.1

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

1.0

D;D

M_CAP

Pathogenic

0.73

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.3

H;.

PhyloP100

PrimateAI

Uncertain

0.77

PROVEAN

Pathogenic

-7.6

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

0.88

Gain of MoRF binding (P = 0.0215);.;

MVP

1.0

MPC

0.57

ClinPred

1.0

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.99

gMVP

0.97

Mutation Taster

=13/87

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over