2-148166663-A-G

Variant names:

• chr2-148166663-A-G
• rs6731167
• NM_001378120.1:c.-924-12037A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_001378120.1(MBD5):​c.-924-12037A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0258 in 152,184 control chromosomes in the GnomAD database, including 99 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.026 (99 hom., cov: 32)
• Consequence: MBD5 NM_001378120.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.09
• Publications: 0 publications found

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0648 is higher than 0.05.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MBD5	NM_001378120.1	MANE Select	c.-924-12037A>G		intron	N/A	NP_001365049.1
	MBD5	NM_001438854.1		c.-924-12037A>G		intron	N/A	NP_001425783.1
	MBD5	NM_001438856.1		c.-924-12037A>G		intron	N/A	NP_001425785.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MBD5	ENST00000642680.2	MANE Select	c.-924-12037A>G		intron	N/A	ENSP00000493871.2
	MBD5	ENST00000407073.5	TSL:1	c.-924-12037A>G		intron	N/A	ENSP00000386049.1
	MBD5	ENST00000638043.2	TSL:5	c.-924-12037A>G		intron	N/A	ENSP00000490728.2

Frequencies

GnomAD3 genomes AF: 0.0258 AC: 3924 AN: 152066 Hom.: 99 Cov.: 32

Gnomad AFR AF: 0.0669

Gnomad AMI AF: 0.0461

Gnomad AMR AF: 0.0178

Gnomad ASJ AF: 0.00807

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00207

Gnomad FIN AF: 0.00142

Gnomad MID AF: 0.0222

Gnomad NFE AF: 0.0107

Gnomad OTH AF: 0.0253

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0258 AC: 3928 AN: 152184 Hom.: 99 Cov.: 32 AF XY: 0.0251 AC XY: 1868 AN XY: 74382

African (AFR) AF: 0.0669 AC: 2777 AN: 41510

American (AMR) AF: 0.0178 AC: 272 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.00807 AC: 28 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5184

South Asian (SAS) AF: 0.00166 AC: 8 AN: 4828

European-Finnish (FIN) AF: 0.00142 AC: 15 AN: 10596

Middle Eastern (MID) AF: 0.0170 AC: 5 AN: 294

European-Non Finnish (NFE) AF: 0.0107 AC: 728 AN: 68006

Other (OTH) AF: 0.0251 AC: 53 AN: 2114

Alfa AF: 0.0192 Hom.: 8

Bravo AF: 0.0281

Asia WGS AF: 0.00693 AC: 24 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	4.8
DANN	Benign	0.64
PhyloP100		1.1
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs6731167; hg19: chr2-148924232;