chr1-45500333-A-G
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Variant summary
Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PVS1PS1_ModeratePM2PP5_Very_Strong
The NM_015506.3(MMACHC):āc.1A>Gā(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.0000041 in 1,461,762 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 Pathogenic (ā ā ).
Frequency
Genomes: not found (cov: 32)
Exomes š: 0.0000041 ( 0 hom. )
Consequence
MMACHC
NM_015506.3 start_lost
NM_015506.3 start_lost
Scores
8
5
3
Clinical Significance
Conservation
PhyloP100: 5.22
Genes affected
MMACHC (HGNC:24525): (metabolism of cobalamin associated C) The exact function of the protein encoded by this gene is not known, however, its C-terminal region shows similarity to TonB, a bacterial protein involved in energy transduction for cobalamin (vitamin B12) uptake. Hence, it is postulated that this protein may have a role in the binding and intracellular trafficking of cobalamin. Mutations in this gene are associated with methylmalonic aciduria and homocystinuria type cblC. [provided by RefSeq, Oct 2009]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 20 ACMG points.
PVS1
Start lost variant, no new inframe start found.
PS1
Another start lost variant in NM_015506.3 (MMACHC) was described as [Pathogenic] in Lovd
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 1-45500333-A-G is Pathogenic according to our data. Variant chr1-45500333-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 381577.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
MMACHC | NM_015506.3 | c.1A>G | p.Met1? | start_lost | 1/4 | ENST00000401061.9 | NP_056321.2 | |
MMACHC | NM_001330540.2 | c.-222A>G | 5_prime_UTR_variant | 1/4 | NP_001317469.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
MMACHC | ENST00000401061.9 | c.1A>G | p.Met1? | start_lost | 1/4 | 2 | NM_015506.3 | ENSP00000383840 | P1 | |
MMACHC | ENST00000616135.1 | upstream_gene_variant | 2 | ENSP00000478859 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
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32
GnomAD3 exomes AF: 0.00000801 AC: 2AN: 249570Hom.: 0 AF XY: 0.0000148 AC XY: 2AN XY: 135394
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GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461762Hom.: 0 Cov.: 30 AF XY: 0.00000688 AC XY: 5AN XY: 727190
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GnomAD4 genome Cov.: 32
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ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:5
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Cobalamin C disease Pathogenic:3
Pathogenic, criteria provided, single submitter | clinical testing | Counsyl | Mar 15, 2017 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Apr 11, 2023 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Dec 26, 2023 | This sequence change affects the initiator methionine of the MMACHC mRNA. The next in-frame methionine is located at codon 58. This variant is present in population databases (rs758477536, gnomAD 0.003%). Disruption of the initiator codon has been observed in individuals with methylmalonic aciduria and homocystinuria (PMID: 16311595, 17768669, 19760748, 28693988). ClinVar contains an entry for this variant (Variation ID: 381577). For these reasons, this variant has been classified as Pathogenic. - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Aug 04, 2022 | Initiation codon variant in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 19370762, 25398587, 19573432, 17768669, 30157807, 29731766, 35314707, 33691766, 32943488, 35361390, 34102818, 30863077, 22560872) - |
Methylmalonic acidemia with homocystinuria cblC Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Uncertain
DANN
Uncertain
DEOGEN2
Benign
T
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
LIST_S2
Uncertain
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D
MetaSVM
Pathogenic
D
MutationTaster
Benign
D
PROVEAN
Benign
N
REVEL
Pathogenic
Sift
Pathogenic
D
Sift4G
Pathogenic
D
Polyphen
P
Vest4
MutPred
Loss of methylation at K4 (P = 0.105);
MVP
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at