rs147370143

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBP6BS1

The NM_015702.3(MMADHC):c.578T>C(p.Val193Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00168 in 1,604,280 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0017 ( 3 hom. )

Consequence

MMADHC
NM_015702.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:5

Conservation

PhyloP100: 8.52

Variant links:

Genes affected

MMADHC (HGNC:25221): (metabolism of cobalamin associated D) This gene encodes a mitochondrial protein that is involved in an early step of vitamin B12 metabolism. Vitamin B12 (cobalamin) is essential for normal development and survival in humans. Mutations in this gene cause methylmalonic aciduria and homocystinuria type cblD (MMADHC), a disorder of cobalamin metabolism that is characterized by decreased levels of the coenzymes adenosylcobalamin and methylcobalamin. Pseudogenes have been identified on chromosomes 11 and X.[provided by RefSeq, Nov 2008]

MMADHC links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.083274096).

BP6

Variant 2-149575742-A-G is Benign according to our data. Variant chr2-149575742-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 285847.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=2}.

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00115 (175/152320) while in subpopulation NFE AF= 0.00198 (135/68020). AF 95% confidence interval is 0.00171. There are 0 homozygotes in gnomad4. There are 84 alleles in male gnomad4 subpopulation. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MMADHC	NM_015702.3 linkuse as main transcript	c.578T>C	p.Val193Ala	missense_variant	6/8	ENST00000303319.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
MMADHC	ENST00000303319.10 linkuse as main transcript	c.578T>C	p.Val193Ala	missense_variant	6/8	1	NM_015702.3	P1
MMADHC	ENST00000422782.2 linkuse as main transcript	c.578T>C	p.Val193Ala	missense_variant	6/9	5
MMADHC	ENST00000428879.5 linkuse as main transcript	c.578T>C	p.Val193Ala	missense_variant	5/7	2		P1

Frequencies

GnomAD3 genomes

AF:

0.00115

AC:

175

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00186

Gnomad FIN

AF:

0.00170

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00198

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.00178

AC:

435

AN:

244924

Hom.:

AF XY:

0.00190

AC XY:

251

AN XY:

132260

show subpopulations

Gnomad AFR exome

AF:

0.000125

Gnomad AMR exome

AF:

0.0000912

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00227

Gnomad FIN exome

AF:

0.00242

Gnomad NFE exome

AF:

0.00269

Gnomad OTH exome

AF:

0.00185

GnomAD4 exome

AF:

0.00174

AC:

2528

AN:

1451960

Hom.:

Cov.:

AF XY:

0.00174

AC XY:

1254

AN XY:

722192

show subpopulations

Gnomad4 AFR exome

AF:

0.000302

Gnomad4 AMR exome

AF:

0.000116

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00172

Gnomad4 FIN exome

AF:

0.00248

Gnomad4 NFE exome

AF:

0.00193

Gnomad4 OTH exome

AF:

0.00165

GnomAD4 genome

AF:

0.00115

AC:

175

AN:

152320

Hom.:

Cov.:

AF XY:

0.00113

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00186

Gnomad4 FIN

AF:

0.00170

Gnomad4 NFE

AF:

0.00198

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.00174

Hom.:

Bravo

AF:

0.00103

TwinsUK

AF:

0.00162

AC:

ALSPAC

AF:

0.00259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.00199

AC:

242

Asia WGS

AF:

0.00116

AC:

AN:

3462

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Methylmalonic aciduria and homocystinuria type cblD

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	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. -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 27, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 14, 2020	- -

not provided

Uncertain:1Benign:2

Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 14, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 16, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 30, 2020	- -

MMADHC-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Sep 01, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Disorders of Intracellular Cobalamin Metabolism

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.53

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Uncertain

-0.020

Cadd

Uncertain

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.58

D;D;D

Eigen

Uncertain

0.45

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Pathogenic

0.98

M_CAP

Benign

0.078

MetaRNN

Benign

0.083

T;T;T

MetaSVM

Uncertain

0.46

MutationAssessor

Uncertain

2.4

M;M;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.52

PROVEAN

Uncertain

-2.4

N;N;N

REVEL

Uncertain

0.62

Sift

Uncertain

0.014

D;D;D

Sift4G

Benign

0.13

T;T;T

Polyphen

0.51

P;P;P

Vest4

0.82

MVP

0.86

MPC

0.058

ClinPred

0.050

GERP RS

5.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.8

Varity_R

0.41

gMVP

0.47

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over