12-109573349-G-T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_052845.4(MMAB):c.132C>A(p.Asp44Glu) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,460,962 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 18/24 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. D44D) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

MMAB
NM_052845.4 missense, splice_region

Scores

Splicing: ADA: 0.01437

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.400

Publications

0 publications found

Variant links:

Genes affected

MMAB (HGNC:19331): (metabolism of cobalamin associated B) This gene encodes a protein that catalyzes the final step in the conversion of vitamin B(12) into adenosylcobalamin (AdoCbl), a vitamin B12-containing coenzyme for methylmalonyl-CoA mutase. Mutations in the gene are the cause of vitamin B12-dependent methylmalonic aciduria linked to the cblB complementation group. Alternatively spliced transcript variants have been found. [provided by RefSeq, Apr 2011]

MMAB links:

MVK (HGNC:7530): (mevalonate kinase) This gene encodes the peroxisomal enzyme mevalonate kinase. Mevalonate is a key intermediate, and mevalonate kinase a key early enzyme, in isoprenoid and sterol synthesis. Mevalonate kinase deficiency caused by mutation of this gene results in mevalonic aciduria, a disease characterized psychomotor retardation, failure to thrive, hepatosplenomegaly, anemia and recurrent febrile crises. Defects in this gene also cause hyperimmunoglobulinaemia D and periodic fever syndrome, a disorder characterized by recurrent episodes of fever associated with lymphadenopathy, arthralgia, gastrointestinal dismay and skin rash. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2014]

MVK Gene-Disease associations (from GenCC):

porokeratosis 3, disseminated superficial actinic type
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
hyperimmunoglobulinemia D with periodic fever
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
mevalonic aciduria
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
disseminated superficial actinic porokeratosis
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
porokeratosis of Mibelli
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

MVK links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM1

In a chain Corrinoid adenosyltransferase MMAB (size 217) in uniprot entity MMAB_HUMAN there are 24 pathogenic changes around while only 8 benign (75%) in NM_052845.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.1081298).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MMAB	NM_052845.4 link	c.132C>A	p.Asp44Glu	missense_variant, splice_region_variant	Exon 1 of 9	ENST00000545712.7	NP_443077.1	Q96EY8
MVK	XM_047428873.1 link	c.64G>T	p.Val22Phe	missense_variant	Exon 1 of 11		XP_047284829.1
MMAB	NR_038118.2 link	n.156C>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 1 of 10
MVK	XM_017019313.3 link	c.-237G>T		5_prime_UTR_variant	Exon 1 of 10		XP_016874802.1	F5H8H2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MMAB	ENST00000545712.7 link	c.132C>A	p.Asp44Glu	missense_variant, splice_region_variant	Exon 1 of 9	1	NM_052845.4	ENSP00000445920.1		Q96EY8

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000405

AC:

AN:

246714

AF XY:

0.00000745

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1460962

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726792

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33458

American (AMR)

AF:

0.00

AC:

AN:

44708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39690

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86218

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52836

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5718

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111852

Other (OTH)

AF:

0.00

AC:

AN:

60356

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.051

BayesDel_noAF

Benign

-0.31

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.13

T;.;T

Eigen

Benign

-0.43

Eigen_PC

Benign

-0.30

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.59

T;T;T

M_CAP

Benign

0.055

MetaRNN

Benign

0.11

T;T;T

MetaSVM

Benign

-0.91

MutationAssessor

Benign

1.5

L;.;.

PhyloP100

0.40

PrimateAI

Benign

0.35

PROVEAN

Benign

-0.50

N;.;.

REVEL

Benign

0.18

Sift

Benign

0.28

T;.;.

Sift4G

Benign

0.57

T;T;T

Polyphen

0.0010

B;.;.

Vest4

0.048

MutPred

0.12

Gain of solvent accessibility (P = 0.1014);Gain of solvent accessibility (P = 0.1014);Gain of solvent accessibility (P = 0.1014);

MVP

0.83

MPC

0.21

ClinPred

0.24

GERP RS

1.5

PromoterAI

0.042

Neutral

(source)

Varity_R

0.058

gMVP

0.24

Mutation Taster

=92/8

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.014

dbscSNV1_RF

Benign

0.17

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over