rs34886916

Positions:

chr2-149576487-C-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_015702.3(MMADHC):c.428G>T(p.Ser143Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0019 in 1,613,632 control chromosomes in the GnomAD database, including 59 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0098 ( 30 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 29 hom. )

Consequence

MMADHC
NM_015702.3 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 0.533

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 -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0064358115).

BP6

Variant 2-149576487-C-A is Benign according to our data. Variant chr2-149576487-C-A is described in ClinVar as [Benign]. Clinvar id is 331379.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-149576487-C-A is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00982 (1495/152288) while in subpopulation AFR AF= 0.0339 (1411/41566). AF 95% confidence interval is 0.0325. There are 30 homozygotes in gnomad4. There are 705 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 30 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MMADHC	NM_015702.3 linkuse as main transcript	c.428G>T	p.Ser143Ile	missense_variant	5/8	ENST00000303319.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
MMADHC	ENST00000303319.10 linkuse as main transcript	c.428G>T	p.Ser143Ile	missense_variant	5/8	1	NM_015702.3	P1
MMADHC	ENST00000422782.2 linkuse as main transcript	c.428G>T	p.Ser143Ile	missense_variant	5/9	5
MMADHC	ENST00000428879.5 linkuse as main transcript	c.428G>T	p.Ser143Ile	missense_variant	4/7	2		P1

Frequencies

GnomAD3 genomes

AF:

0.00978

AC:

1488

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0339

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00334

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:

0.000147

Gnomad OTH

AF:

0.0110

GnomAD3 exomes

AF:

0.00259

AC:

651

AN:

251344

Hom.:

AF XY:

0.00196

AC XY:

266

AN XY:

135848

show subpopulations

Gnomad AFR exome

AF:

0.0349

Gnomad AMR exome

AF:

0.00179

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000880

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.00108

AC:

1574

AN:

1461344

Hom.:

Cov.:

AF XY:

0.000916

AC XY:

666

AN XY:

726994

show subpopulations

Gnomad4 AFR exome

AF:

0.0369

Gnomad4 AMR exome

AF:

0.00201

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000116

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.0000828

Gnomad4 OTH exome

AF:

0.00222

GnomAD4 genome

AF:

0.00982

AC:

1495

AN:

152288

Hom.:

Cov.:

AF XY:

0.00947

AC XY:

705

AN XY:

74460

show subpopulations

Gnomad4 AFR

AF:

0.0339

Gnomad4 AMR

AF:

0.00333

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.0109

Alfa

AF:

0.00360

Hom.:

Bravo

AF:

0.0112

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.0338

AC:

149

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00316

AC:

384

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.000273

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Methylmalonic aciduria and homocystinuria type cblD

Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 29, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

not provided

Benign:2

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 29, 2023	- -

not specified

Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 03, 2016

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

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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 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

0.18

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.28

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.38

T;T;T

Eigen

Benign

-0.12

Eigen_PC

Benign

-0.019

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.90

.;D;D

MetaRNN

Benign

0.0064

T;T;T

MetaSVM

Benign

-0.58

MutationAssessor

Benign

1.4

L;L;.

MutationTaster

Benign

0.96

N;N;N

PrimateAI

Benign

0.39

PROVEAN

Benign

-2.1

N;N;N

REVEL

Benign

0.23

Sift

Uncertain

0.026

D;D;T

Sift4G

Benign

0.19

T;T;T

Polyphen

0.24

B;B;P

Vest4

0.40

MVP

0.75

MPC

0.040

ClinPred

0.037

GERP RS

2.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.17

gMVP

0.28

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