Genetic Variant MBD5:c.2519-8C>T (chr2-148483102-C-T) – ACMG Classification: Likely_benign (-6 pts)

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_StrongBP6_Moderate

The NM_001378120.1(MBD5):c.2519-8C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00037 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MBD5
NM_001378120.1 splice_region, intron

Scores

Splicing: ADA: 0.00008760

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 0.0330

Publications

0 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: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.79).

BP6

Variant 2-148483102-C-T is Benign according to our data. Variant chr2-148483102-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 468774.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MBD5	NM_001378120.1 link	c.2519-8C>T		splice_region_variant, intron_variant	Intron 8 of 13	ENST00000642680.2	NP_001365049.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MBD5	ENST00000642680.2 link	c.2519-8C>T		splice_region_variant, intron_variant	Intron 8 of 13		NM_001378120.1	ENSP00000493871.2		A0A2R8YDL9

Frequencies

GnomAD3 genomes

AF:

0.000121

AC:

AN:

124350

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000614

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000709

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000137

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00178

AC:

350

AN:

196456

AF XY:

0.00151

show subpopulations

Gnomad AFR exome

AF:

0.00347

Gnomad AMR exome

AF:

0.000158

Gnomad ASJ exome

AF:

0.00254

Gnomad EAS exome

AF:

0.00132

Gnomad FIN exome

AF:

0.00113

Gnomad NFE exome

AF:

0.00243

Gnomad OTH exome

AF:

0.00204

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.000368

AC:

493

AN:

1340892

Hom.:

Cov.:

AF XY:

0.000332

AC XY:

220

AN XY:

663614

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00155

AC:

AN:

28416

American (AMR)

AF:

0.00361

AC:

119

AN:

32988

Ashkenazi Jewish (ASJ)

AF:

0.00104

AC:

AN:

23114

East Asian (EAS)

AF:

0.000262

AC:

AN:

34400

South Asian (SAS)

AF:

0.000517

AC:

AN:

63864

European-Finnish (FIN)

AF:

0.000213

AC:

AN:

42302

Middle Eastern (MID)

AF:

0.00169

AC:

AN:

5316

European-Non Finnish (NFE)

AF:

0.000208

AC:

220

AN:

1055338

Other (OTH)

AF:

0.000471

AC:

AN:

55154

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.269

Heterozygous variant carriers

128

170

213

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

Data not reliable, filtered out with message: AS_VQSR

AF:

0.000121

AC:

AN:

124350

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

59536

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000614

AC:

AN:

32590

American (AMR)

AF:

0.00

AC:

AN:

12220

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3070

East Asian (EAS)

AF:

0.00

AC:

AN:

4262

South Asian (SAS)

AF:

0.00

AC:

AN:

3900

European-Finnish (FIN)

AF:

0.000709

AC:

AN:

7050

Middle Eastern (MID)

AF:

0.00

AC:

AN:

266

European-Non Finnish (NFE)

AF:

0.000137

AC:

AN:

58528

Other (OTH)

AF:

0.00

AC:

AN:

1684

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.258

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:

0.00

Hom.:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Intellectual disability, autosomal dominant 1

Benign:1

May 03, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.79

CADD

Benign

1.6

(source)

DANN

Benign

0.53

PhyloP100

0.033

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000088

dbscSNV1_RF

Benign

0.0

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