rs776138490

Variant names:

• chr3-183015527-C-A
• rs776138490
• NM_020166.5:c.2089G>T

Your query was ambiguous. Multiple possible variants found:

• chr3-183015527-C-A
• chr3-183015527-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020166.5(MCCC1):​c.2089G>T​(p.Val697Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V697M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MCCC1 NM_020166.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.67
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• 3-methylcrotonyl-CoA carboxylase 1 deficiency

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

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.21977183).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_020166.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MCCC1	NM_020166.5	MANE Select	c.2089G>T	p.Val697Leu	missense	Exon 19 of 19	NP_064551.3
	MCCC1	NM_001363880.1		c.1762G>T	p.Val588Leu	missense	Exon 18 of 18	NP_001350809.1	E9PHF7
	MCCC1	NM_001293273.2		c.1738G>T	p.Val580Leu	missense	Exon 17 of 17	NP_001280202.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MCCC1	ENST00000265594.9	TSL:1 MANE Select	c.2089G>T	p.Val697Leu	missense	Exon 19 of 19	ENSP00000265594.4	Q96RQ3
	MCCC1	ENST00000492597.5	TSL:1	c.1762G>T	p.Val588Leu	missense	Exon 18 of 18	ENSP00000419898.1	E9PHF7
	MCCC1	ENST00000497830.5	TSL:1	n.*1686G>T		non_coding_transcript_exon	Exon 17 of 17	ENSP00000420088.1	F2Z3E2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.29
BayesDel_addAF	Benign	-0.023	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	18
DANN	Uncertain	0.98
DEOGEN2	Benign	0.35	T
Eigen	Benign	-0.37
Eigen_PC	Benign	-0.28
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	D
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.22	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.6	L
PhyloP100		2.7
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.22
Sift	Benign	0.18	T
Sift4G	Benign	0.36	T
Polyphen		0.39	B
Vest4		0.38
MutPred		0.64		Loss of methylation at K696 (P = 0.038)
MVP		0.66
MPC		0.20
ClinPred		0.68	D
GERP RS		3.8
Varity_R		0.16
gMVP		0.77
Mutation Taster		=60/40	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs776138490; hg19: chr3-182733315;