3-183017269-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_020166.5(MCCC1):c.2046G>C(p.Met682Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000134 in 1,613,650 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

MCCC1
NM_020166.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 6.04

Variant links:

Genes affected

MCCC1 (HGNC:6936): (methylcrotonyl-CoA carboxylase subunit 1) This gene encodes the large 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. [provided by RefSeq, Jul 2008]

MCCC1 links:

MCCC1-AS1 (HGNC:40366): (MCCC1 antisense RNA 1)

MCCC1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCCC1	NM_020166.5 link	c.2046G>C	p.Met682Ile	missense_variant	Exon 18 of 19	ENST00000265594.9	NP_064551.3	Q96RQ3A0A0S2Z693

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MCCC1	ENST00000265594.9 link	c.2046G>C	p.Met682Ile	missense_variant	Exon 18 of 19	1	NM_020166.5	ENSP00000265594.4		Q96RQ3

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152206

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:

0.000118

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000996

AC:

AN:

251118

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135754

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

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:

0.000211

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000142

AC:

208

AN:

1461326

Hom.:

Cov.:

AF XY:

0.000149

AC XY:

108

AN XY:

727018

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000188

Gnomad4 NFE exome

AF:

0.000176

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152324

Hom.:

Cov.:

AF XY:

0.0000805

AC XY:

AN XY:

74488

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:

0.000118

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000158

Hom.:

Bravo

AF:

0.000106

ExAC

AF:

0.000165

AC:

EpiCase

AF:

0.000273

EpiControl

AF:

0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Nov 09, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2046G>C (p.M682I) alteration is located in exon 18 (coding exon 18) of the MCCC1 gene. This alteration results from a G to C substitution at nucleotide position 2046, causing the methionine (M) at amino acid position 682 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

3-methylcrotonyl-CoA carboxylase 1 deficiency

Uncertain:1

Aug 27, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces methionine with isoleucine at codon 682 of the MCCC1 protein (p.Met682Ile). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and isoleucine. This variant is present in population databases (rs200415465, ExAC 0.03%). This variant has not been reported in the literature in individuals affected with MCCC1-related conditions. 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: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.67

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.25

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.82

D;T;T

Eigen

Pathogenic

0.93

Eigen_PC

Pathogenic

0.90

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

D;D;D

M_CAP

Benign

0.035

MetaRNN

Uncertain

0.73

D;D;D

MetaSVM

Uncertain

-0.047

MutationAssessor

Uncertain

2.8

M;.;.

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-3.8

D;D;.

REVEL

Uncertain

0.51

Sift

Uncertain

0.0020

D;D;.

Sift4G

Uncertain

0.0020

D;D;D

Polyphen

1.0

D;D;.

Vest4

0.83

MutPred

0.83

Gain of methylation at K681 (P = 0.0463);.;.;

MVP

0.74

MPC

0.64

ClinPred

0.64

GERP RS

6.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.65

gMVP

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