chr2-148468374-C-T

Position:

• chr2-148468374-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001378120.1(MBD5):​c.431C>T​(p.Thr144Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MBD5 NM_001378120.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.74

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.35738814).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MBD5	NM_001378120.1	c.431C>T	p.Thr144Ile	missense_variant	8/14	ENST00000642680.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MBD5	ENST00000642680.2	c.431C>T	p.Thr144Ile	missense_variant	8/14		NM_001378120.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, autosomal dominant 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

curation

SIB Swiss Institute of Bioinformatics

Apr 16, 2018

This variant is interpreted as a Uncertain Significance, for Mental retardation, autosomal dominant 1, Autosomal Dominant inheritance. The following ACMG Tag(s) were applied: PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.025	T
BayesDel_noAF	Benign	-0.27
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.058	T;.;.;.;T
Eigen	Uncertain	0.64
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.81	T;.;T;T;T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.36	T;T;T;T;T
MetaSVM	Benign	-0.73	T
MutationAssessor	Benign	1.8	L;.;.;L;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-1.7	N;.;.;.;N
REVEL	Benign	0.28
Sift	Uncertain	0.0020	D;.;.;.;D
Sift4G	Uncertain	0.029	D;.;.;T;D
Polyphen		1.0	D;.;.;.;.
Vest4		0.69
MutPred		0.16		Loss of phosphorylation at T144 (P = 0.0061);Loss of phosphorylation at T144 (P = 0.0061);Loss of phosphorylation at T144 (P = 0.0061);Loss of phosphorylation at T144 (P = 0.0061);Loss of phosphorylation at T144 (P = 0.0061);
MVP		0.15
MPC		0.50
ClinPred		0.95	D
GERP RS		5.5
Varity_R		0.29
gMVP		0.61

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

LitVar

Other links and lift over

dbSNP: rs1553518402; hg19: chr2-149225943;