rs114276563

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_015702.3(MMADHC):c.473G>A(p.Arg158Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00112 in 1,601,534 control chromosomes in the GnomAD database, including 20 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0056 ( 11 hom., cov: 33)

Exomes 𝑓: 0.00065 ( 9 hom. )

Consequence

MMADHC
NM_015702.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 0.966

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

inborn disorder of cobalamin metabolism and transport
Inheritance: AR Classification: DEFINITIVE Submitted by: Ambry Genetics, ClinGen
methylmalonic aciduria and homocystinuria type cblD
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)

MMADHC links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.007001728).

BP6

Variant 2-149576442-C-T is Benign according to our data. Variant chr2-149576442-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 377064.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00558 (850/152210) while in subpopulation AFR AF = 0.0194 (804/41526). AF 95% confidence interval is 0.0183. There are 11 homozygotes in GnomAd4. There are 403 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 11 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MMADHC	NM_015702.3 link	c.473G>A	p.Arg158Gln	missense_variant	Exon 5 of 8	ENST00000303319.10	NP_056517.1	Q9H3L0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MMADHC	ENST00000303319.10 link	c.473G>A	p.Arg158Gln	missense_variant	Exon 5 of 8	1	NM_015702.3	ENSP00000301920.5	Q9H3L0
MMADHC	ENST00000422782.2 link	c.473G>A	p.Arg158Gln	missense_variant	Exon 5 of 9	5		ENSP00000408331.2	F8WEC0
MMADHC	ENST00000428879.5 link	c.473G>A	p.Arg158Gln	missense_variant	Exon 4 of 7	2		ENSP00000389060.1	Q9H3L0

Frequencies

GnomAD3 genomes

AF:

0.00556

AC:

846

AN:

152092

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00236

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.00152

AC:

382

AN:

251312

AF XY:

0.00105

show subpopulations

Gnomad AFR exome

AF:

0.0204

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000440

Gnomad OTH exome

AF:

0.00163

GnomAD4 exome

AF:

0.000651

AC:

943

AN:

1449324

Hom.:

Cov.:

AF XY:

0.000567

AC XY:

409

AN XY:

721866

show subpopulations

African (AFR)

AF:

0.0229

AC:

764

AN:

33294

American (AMR)

AF:

0.00110

AC:

AN:

44704

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26050

East Asian (EAS)

AF:

0.00

AC:

AN:

39562

South Asian (SAS)

AF:

0.0000814

AC:

AN:

85968

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.000871

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

0.0000336

AC:

AN:

1100652

Other (OTH)

AF:

0.00135

AC:

AN:

59948

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

128

170

213

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00558

AC:

850

AN:

152210

Hom.:

Cov.:

AF XY:

0.00542

AC XY:

403

AN XY:

74416

show subpopulations

African (AFR)

AF:

0.0194

AC:

804

AN:

41526

American (AMR)

AF:

0.00235

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000735

AC:

AN:

67992

Other (OTH)

AF:

0.00189

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.506

Heterozygous variant carriers

119

159

199

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00212

Hom.:

Bravo

AF:

0.00660

ESP6500AA

AF:

0.0170

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00182

AC:

221

Asia WGS

AF:

0.00144

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Methylmalonic aciduria and homocystinuria type cblD

Benign:2

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. -

not provided

Benign:2

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Jan 13, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not specified

Benign:1

Oct 06, 2016

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Disorders of Intracellular Cobalamin Metabolism

Benign:1

Jan 12, 2018

Illumina Laboratory Services, Illumina

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.061

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.31

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.39

T;T;T

Eigen

Benign

-0.15

Eigen_PC

Benign

-0.033

FATHMM_MKL

Uncertain

0.79

LIST_S2

Uncertain

0.93

.;D;D

MetaRNN

Benign

0.0070

T;T;T

MetaSVM

Uncertain

-0.28

MutationAssessor

Benign

2.0

M;M;.

PhyloP100

0.97

PrimateAI

Benign

0.27

PROVEAN

Benign

-1.5

N;N;N

REVEL

Benign

0.27

Sift

Benign

0.039

D;D;D

Sift4G

Benign

0.11

T;T;T

Polyphen

0.0080

B;B;B

Vest4

0.20

MVP

0.70

MPC

0.037

ClinPred

0.010

GERP RS

3.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.15

gMVP

0.31

Mutation Taster

=96/4

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over