rs727503998

Positions:

• chr2-148469513-C-G
• chr2-148469513-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001378120.1(MBD5):​c.1570C>G​(p.Pro524Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MBD5 NM_001378120.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.24

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12736195).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MBD5	NM_001378120.1	c.1570C>G	p.Pro524Ala	missense_variant	8/14	ENST00000642680.2	NP_001365049.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MBD5	ENST00000642680.2	c.1570C>G	p.Pro524Ala	missense_variant	8/14		NM_001378120.1	ENSP00000493871.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	22
DANN	Benign	0.79
DEOGEN2	Benign	0.065	T;.;.;.;T
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.0020
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.81	T;.;T;T;T
M_CAP	Benign	0.0080	T
MetaRNN	Benign	0.13	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.81	L;.;.;L;.
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-2.1	N;.;.;.;N
REVEL	Benign	0.073
Sift	Uncertain	0.020	D;.;.;.;D
Sift4G	Benign	0.16	T;.;.;T;T
Polyphen		0.0060	B;.;.;.;.
Vest4		0.52
MutPred		0.24		Loss of loop (P = 0.0022);Loss of loop (P = 0.0022);Loss of loop (P = 0.0022);Loss of loop (P = 0.0022);Loss of loop (P = 0.0022);
MVP		0.17
MPC		0.48
ClinPred		0.19	T
GERP RS		3.9
Varity_R		0.090
gMVP		0.21

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

Other links and lift over

dbSNP: rs727503998; hg19: chr2-149227082;