NM_020166.5(MCCC1):c.254A>C (p.Asn85Thr) AND 3-methylcrotonyl-CoA carboxylase 1 deficiency

Germline classification:: Conflicting classifications of pathogenicity (3 submissions)
Last evaluated:: Jan 30, 2025
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000865064.18

Allele description [Variation Report for NM_020166.5(MCCC1):c.254A>C (p.Asn85Thr)]

NM_020166.5(MCCC1):c.254A>C (p.Asn85Thr)

Gene:

MCCC1:methylcrotonyl-CoA carboxylase subunit 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

3q27.1

Genomic location:

Preferred name:

NM_020166.5(MCCC1):c.254A>C (p.Asn85Thr)

HGVS:

NC_000003.12:g.183092428T>G
NG_008100.1:g.12150A>C
NM_001293273.2:c.44+2131A>C
NM_001363880.1:c.-55+2131A>C
NM_020166.5:c.254A>CMANE SELECT
NP_064551.3:p.Asn85Thr
NC_000003.11:g.182810216T>G
NC_000003.11:g.182810216T>G
NM_020166.3:c.254A>C
NM_020166.4:c.254A>C
NR_120640.2:n.921A>C

Protein change:

N85T

Links:

dbSNP: rs148616219

NCBI 1000 Genomes Browser:

rs148616219

Molecular consequence:

NM_001293273.2:c.44+2131A>C - intron variant - [Sequence Ontology: SO:0001627]
NM_001363880.1:c.-55+2131A>C - intron variant - [Sequence Ontology: SO:0001627]
NM_020166.5:c.254A>C - missense variant - [Sequence Ontology: SO:0001583]
NR_120640.2:n.921A>C - non-coding transcript variant - [Sequence Ontology: SO:0001619]

Condition(s)

Name:: 3-methylcrotonyl-CoA carboxylase 1 deficiency (MCC1D)
Synonyms:: MCCD TYPE 1; METHYLCROTONYLGLYCINURIA TYPE I; MCC 1 deficiency; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0008861; MedGen: C0268600; Orphanet: 6; OMIM: 210200

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV001005967	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Likely benign (Jan 30, 2025)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV001304669	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Uncertain significance (Jan 13, 2018)	germline	clinical testing	Citation Link,
SCV001456497	Natera, Inc.	no assertion criteria provided	Likely benign (Jun 5, 2020)	germline	clinical testing

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001005967

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Likely benign
(Jan 30, 2025)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

SCV001304669

Illumina Laboratory Services, Illumina

criteria provided, single submitter

(ICSL Variant Classification Criteria 13 December 2019)

Uncertain significance
(Jan 13, 2018)

germline

clinical testing

Citation Link,

SCV001456497

Natera, Inc.

no assertion criteria provided

Likely benign
(Jun 5, 2020)

germline

clinical testing

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group, Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9..

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001005967.6

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Illumina Laboratory Services, Illumina, SCV001304669.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Natera, Inc., SCV001456497.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Feb 25, 2025

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