ClinVar Miner

Submissions for variant NM_052845.4(MMAB):c.472G>A (p.Asp158Asn)

gnomAD frequency: 0.00006  dbSNP: rs925180956
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Genome-Nilou Lab RCV001578622 SCV001805869 uncertain significance Methylmalonic aciduria, cblB type 2021-07-14 criteria provided, single submitter clinical testing
Invitae RCV001578622 SCV002250855 uncertain significance Methylmalonic aciduria, cblB type 2022-09-13 criteria provided, single submitter clinical testing This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 158 of the MMAB protein (p.Asp158Asn). This variant is present in population databases (no rsID available, gnomAD 0.007%). This variant has not been reported in the literature in individuals affected with MMAB-related conditions. ClinVar contains an entry for this variant (Variation ID: 1209578). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt MMAB protein function. 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.
Ambry Genetics RCV002573243 SCV003675053 uncertain significance Inborn genetic diseases 2021-10-26 criteria provided, single submitter clinical testing The c.472G>A (p.D158N) alteration is located in exon 6 (coding exon 6) of the MMAB gene. This alteration results from a G to A substitution at nucleotide position 472, causing the aspartic acid (D) at amino acid position 158 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear.

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