Genetic Variant NM_001378120.1:c.3678G>C (chr2-148485875-G-C) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_ModerateBP6BS1BS2

The NM_001378120.1(MBD5):c.3678G>C(p.Gln1226His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000217 in 1,614,082 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Q1226P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00022 ( 1 hom. )

Consequence

MBD5
NM_001378120.1 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:5

Conservation

PhyloP100: 1.63

Publications

3 publications found

Variant links:

Genes affected

MBD5 (HGNC:20444): (methyl-CpG binding domain protein 5) This gene encodes a member of the methyl-CpG-binding domain (MBD) family. The MBD consists of about 70 residues and is the minimal region required for a methyl-CpG-binding protein binding specifically to methylated DNA. In addition to the MBD domain, this protein contains a PWWP domain (Pro-Trp-Trp-Pro motif), which consists of 100-150 amino acids and is found in numerous proteins that are involved in cell division, growth and differentiation. Mutations in this gene cause an autosomal dominant type of cognitive disability. The encoded protein interacts with the polycomb repressive complex PR-DUB which catalyzes the deubiquitination of a lysine residue of histone 2A. Haploinsufficiency of this gene is associated with a syndrome involving microcephaly, intellectual disabilities, severe speech impairment, and seizures. Alternatively spliced transcript variants have been found, but their full-length nature is not determined. [provided by RefSeq, Jul 2017]

MBD5 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
intellectual disability, autosomal dominant 1
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
autosomal dominant non-syndromic intellectual disability
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

MBD5 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.11062965).

BP6

Variant 2-148485875-G-C is Benign according to our data. Variant chr2-148485875-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 206115.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000177 (27/152250) while in subpopulation SAS AF = 0.000415 (2/4822). AF 95% confidence interval is 0.000194. There are 0 homozygotes in GnomAd4. There are 14 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 27 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001378120.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MBD5	NM_001378120.1	MANE Select	c.3678G>C	p.Gln1226His	missense	Exon 10 of 14	NP_001365049.1
MBD5	NM_001438854.1		c.3678G>C	p.Gln1226His	missense	Exon 11 of 15	NP_001425783.1
MBD5	NM_001438856.1		c.3678G>C	p.Gln1226His	missense	Exon 11 of 15	NP_001425785.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MBD5	ENST00000642680.2	MANE Select	c.3678G>C	p.Gln1226His	missense	Exon 10 of 14	ENSP00000493871.2
MBD5	ENST00000407073.5	TSL:1	c.2979G>C	p.Gln993His	missense	Exon 11 of 15	ENSP00000386049.1
MBD5	ENST00000638043.2	TSL:5	c.2979G>C	p.Gln993His	missense	Exon 10 of 14	ENSP00000490728.2

Frequencies

GnomAD3 genomes

AF:

0.000177

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00318

Gnomad NFE

AF:

0.000294

Gnomad OTH

AF:

0.000958

GnomAD2 exomes

AF:

0.000203

AC:

AN:

251422

AF XY:

0.000258

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000260

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000290

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000222

AC:

324

AN:

1461832

Hom.:

Cov.:

AF XY:

0.000252

AC XY:

183

AN XY:

727222

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.000224

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.000162

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00104

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000247

AC:

275

AN:

1111964

Other (OTH)

AF:

0.000315

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.476

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

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

GnomAD4 genome

AF:

0.000177

AC:

AN:

152250

Hom.:

Cov.:

AF XY:

0.000188

AC XY:

AN XY:

74422

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41560

American (AMR)

AF:

0.0000654

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5170

South Asian (SAS)

AF:

0.000415

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10598

Middle Eastern (MID)

AF:

0.00342

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.000294

AC:

AN:

68026

Other (OTH)

AF:

0.000948

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

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:

0.000209

Hom.:

Bravo

AF:

0.000181

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000189

AC:

EpiCase

AF:

0.000654

EpiControl

AF:

0.000356

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

Jan 07, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Apr 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MBD5: BP4, BS1

Mar 14, 2017

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Bilateral tonic-clonic seizure

Uncertain:1

Apr 03, 2017

Clinical Molecular Genetics Laboratory, Johns Hopkins All Children's Hospital

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Intellectual disability, autosomal dominant 1

Benign:1

Jan 17, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Inborn genetic diseases

Benign:1

Feb 10, 2022

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

MBD5-related disorder

Benign:1

Mar 17, 2021

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

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).

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.41

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.057

Eigen

Benign

-0.12

Eigen_PC

Benign

-0.0092

FATHMM_MKL

Uncertain

0.85

LIST_S2

Benign

0.81

M_CAP

Benign

0.0036

MetaRNN

Benign

0.11

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.26

PhyloP100

1.6

PrimateAI

Benign

0.48

PROVEAN

Benign

-1.1

REVEL

Benign

0.21

Sift

Benign

0.23

Sift4G

Benign

0.37

Polyphen

0.0050

Vest4

0.51

MutPred

0.18

Loss of helix (P = 0.1706)

MVP

0.36

MPC

0.15

ClinPred

0.068

GERP RS

2.5

Varity_R

0.082

gMVP

0.33

Mutation Taster

=86/14

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over