chr3-129436827-C-A

Position:

• chr3-129436827-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001276270.2(MBD4):​c.817G>T​(p.Ala273Ser) 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. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A273T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MBD4 NM_001276270.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.275

Genes affected

MBD4 (HGNC:6919): (methyl-CpG binding domain 4, DNA glycosylase) The protein encoded by this gene is a member of a family of nuclear proteins related by the presence of a methyl-CpG binding domain (MBD). These proteins are capable of binding specifically to methylated DNA, and some members can also repress transcription from methylated gene promoters. This protein contains an MBD domain at the N-terminus that functions both in binding to methylated DNA and in protein interactions and a C-terminal mismatch-specific glycosylase domain that is involved in DNA repair. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Jan 2013]

IFT122 (HGNC:13556): (intraflagellar transport 122) This gene encodes a member of the WD repeat protein family. WD repeats are minimally conserved regions of approximately 40 amino acids typically bracketed by gly-his and trp-asp (GH-WD), which may facilitate formation of heterotrimeric or multiprotein complexes. Members of this family are involved in a variety of cellular processes, including cell cycle progression, signal transduction, apoptosis, and gene regulation. This cytoplasmic protein contains seven WD repeats and an AF-2 domain which function by recruiting coregulatory molecules and in transcriptional activation. Mutations in this gene cause cranioectodermal dysplasia-1. A related pseudogene is located on chromosome 3. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2013]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06307575).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MBD4	NM_001276270.2	c.817G>T	p.Ala273Ser	missense_variant	3/8	ENST00000429544.7	NP_001263199.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MBD4	ENST00000429544.7	c.817G>T	p.Ala273Ser	missense_variant	3/8	1	NM_001276270.2	ENSP00000394080	A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

Alfa AF: 0.0225 Hom.: 801

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	12
DANN	Uncertain	0.98
DEOGEN2	Benign	0.13	.;T;.;.
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.20	N
LIST_S2	Benign	0.71	T;T;T;T
M_CAP	Benign	0.053	D
MetaRNN	Benign	0.063	T;T;T;T
MetaSVM	Benign	-0.44	T
MutationAssessor	Benign	1.4	L;L;L;L
MutationTaster	Benign	1.0	P;P;P;P;P
PrimateAI	Benign	0.22	T
PROVEAN	Benign	-0.54	N;N;N;N
REVEL	Benign	0.16
Sift	Uncertain	0.018	D;D;D;D
Sift4G	Benign	0.51	T;T;T;T
Polyphen		0.041	B;B;B;.
Vest4		0.071
MutPred		0.027		Gain of relative solvent accessibility (P = 0.0098);Gain of relative solvent accessibility (P = 0.0098);Gain of relative solvent accessibility (P = 0.0098);Gain of relative solvent accessibility (P = 0.0098);
MVP		0.60
MPC		0.095
ClinPred		0.086	T
GERP RS		-0.94
Varity_R		0.15
gMVP		0.15

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: rs10342; hg19: chr3-129155670;