rs773774134
Variant summary
Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1PM2PM5PP3_StrongPP5
The NM_022132.5(MCCC2):c.568C>T(p.His190Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,613,966 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. H190R) has been classified as Pathogenic.
Frequency
Consequence
NM_022132.5 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 11 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MCCC2 | NM_022132.5 | c.568C>T | p.His190Tyr | missense_variant | 6/17 | ENST00000340941.11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MCCC2 | ENST00000340941.11 | c.568C>T | p.His190Tyr | missense_variant | 6/17 | 1 | NM_022132.5 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000263 AC: 4AN: 152090Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000159 AC: 4AN: 251464Hom.: 0 AF XY: 0.0000147 AC XY: 2AN XY: 135906
GnomAD4 exome AF: 0.00000889 AC: 13AN: 1461876Hom.: 0 Cov.: 31 AF XY: 0.0000124 AC XY: 9AN XY: 727236
GnomAD4 genome ? AF: 0.0000263 AC: 4AN: 152090Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1AN XY: 74306
ClinVar
Submissions by phenotype
3-methylcrotonyl-CoA carboxylase 2 deficiency Pathogenic:2Uncertain:1
Likely pathogenic, criteria provided, single submitter | curation | SIB Swiss Institute of Bioinformatics | Oct 15, 2018 | This variant is interpreted as Likely Pathogenic, for MCC2 deficiency, autosomal recessive. The following ACMG Tag(s) were applied: PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PP3 => Multiple lines of computational evidence support a deleterious effect on the gene or gene product. PS3 => Well-established functional studies show a deleterious effect (https://www.ncbi.nlm.nih.gov/pubmed/16010683). - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Sep 01, 2021 | This sequence change replaces histidine with tyrosine at codon 190 of the MCCC2 protein (p.His190Tyr). The histidine residue is highly conserved and there is a moderate physicochemical difference between histidine and tyrosine. This variant is present in population databases (rs773774134, ExAC 0.001%). This missense change has been observed in individual(s) with 3-methylcrotonyl-CoA carboxylase deficiency (PMID: 16010683). ClinVar contains an entry for this variant (Variation ID: 198252). 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 disruptive. Experimental studies have shown that this missense change affects MCCC2 function (PMID: 16010683). This variant disrupts the p.His190 amino acid residue in MCCC2. Other variant(s) that disrupt this residue have been observed in individuals with MCCC2-related conditions (PMID: 16010683, 17968484), which suggests that this may be a clinically significant amino acid residue. 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. - |
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Aug 25, 2023 | - - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | May 04, 2015 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Sep 20, 2018 | The H190Y variant in the MCCC2 gene has been reported previously in association with 3-methylcrotonyl-CoA carboxylase deficiency, in an affected individual who was homozygous for the H190Y variant (Dantas et al., 2005). This variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016). The H190Y variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. In-silico analyses, including protein predictors and evolutionary conservation, support a deleterious effect, and expression studies found that H190Y is associated with severely decreased 3-methylcrotonyl-CoA carboxylase activity (Dantas et al., 2005). Missense variants in the same codon (H190R) and nearby residues (R193C and R193H) have been reported in the Human Gene Mutation Database in association with 3-methylcrotonyl-CoA carboxylase deficiency (Stenson et al., 2014), supporting the functional importance of this region of the protein. We interpret H190Y as a pathogenic variant. - |
Methylcrotonyl-CoA carboxylase deficiency Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Sep 10, 2022 | Variant summary: MCCC2 c.568C>T (p.His190Tyr) results in a conservative amino acid change located in the Acetyl-coenzyme A carboxyltransferase, N-terminal domain (IPR011762) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.6e-05 in 251464 control chromosomes. c.568C>T has been reported in the literature as a homozygous genotype in at-least one individual affected with a mild phenotype of Methylcrotonyl-CoA Carboxylase Deficiency (example, Dantas_2005). These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function in-vitro (example, Dantas_2005). The most pronounced variant effect results in absence of normal 3-methylcrotonyl-CoA carboxylase (MCC) activity. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 (VUS, n=1; P/LP, n=3). Based on the evidence outlined above, the variant was classified as likely pathogenic. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at