rs121908944

Variant names:

• chr20-32805343-T-G
• rs121908944
• NM_006892.4:c.2237T>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP5

The NM_006892.4(DNMT3B):​c.2237T>G​(p.Val746Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V746M) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: DNMT3B NM_006892.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 6.88
• Publications: 2 publications found

Genes affected

DNMT3B (HGNC:2979): (DNA methyltransferase 3 beta) CpG methylation is an epigenetic modification that is important for embryonic development, imprinting, and X-chromosome inactivation. Studies in mice have demonstrated that DNA methylation is required for mammalian development. This gene encodes a DNA methyltransferase which is thought to function in de novo methylation, rather than maintenance methylation. The protein localizes primarily to the nucleus and its expression is developmentally regulated. Mutations in this gene cause the immunodeficiency-centromeric instability-facial anomalies (ICF) syndrome. Eight alternatively spliced transcript variants have been described. The full length sequences of variants 4 and 5 have not been determined. [provided by RefSeq, May 2011]

DNMT3B Gene-Disease associations (from GenCC):

• immunodeficiency-centromeric instability-facial anomalies syndrome 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• facioscapulohumeral muscular dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• immunodeficiency-centromeric instability-facial anomalies syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 20-32805343-T-G is Pathogenic according to our data. Variant chr20-32805343-T-G is described in ClinVar as Pathogenic. ClinVar VariationId is 6742.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNMT3B	NM_006892.4	c.2237T>G	p.Val746Gly	missense_variant	Exon 21 of 23	ENST00000328111.6	NP_008823.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNMT3B	ENST00000328111.6	c.2237T>G	p.Val746Gly	missense_variant	Exon 21 of 23	1	NM_006892.4	ENSP00000328547.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Immunodeficiency-centromeric instability-facial anomalies syndrome 1 Pathogenic:1

Nov 11, 1999

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.19
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.62	D;.;.
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D;D;D
M_CAP	Pathogenic	0.37	D
MetaRNN	Uncertain	0.73	D;D;D
MetaSVM	Pathogenic	0.87	D
MutationAssessor	Benign	1.2	L;.;.
PhyloP100		6.9
PrimateAI	Benign	0.42	T
PROVEAN	Uncertain	-4.3	D;D;D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0090	D;D;D
Sift4G	Uncertain	0.051	T;T;T
Polyphen		0.96	D;P;P
Vest4		0.49
MutPred		0.65		Gain of disorder (P = 0.0081);.;.;
MVP		0.90
MPC		2.1
ClinPred		0.99	D
GERP RS		5.8
Varity_R		0.80
gMVP		0.70
Mutation Taster		=9/91	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs121908944; hg19: chr20-31393149;