20-32784843-G-C

Position:

• chr20-32784843-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_006892.4(DNMT3B):​c.290G>C​(p.Arg97Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 152,070 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 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: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: DNMT3B NM_006892.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.128

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), DNMT3B. . Gene score misZ 1.5 (greater than the threshold 3.09). Trascript score misZ 3.3234 (greater than threshold 3.09). GenCC has associacion of gene with immunodeficiency-centromeric instability-facial anomalies syndrome, immunodeficiency-centromeric instability-facial anomalies syndrome 1.
• BP4: Computational evidence support a benign effect (MetaRNN=0.11565134).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DNMT3B	NM_006892.4	c.290G>C	p.Arg97Pro	missense_variant	4/23	ENST00000328111.6	NP_008823.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNMT3B	ENST00000328111.6	c.290G>C	p.Arg97Pro	missense_variant	4/23	1	NM_006892.4	ENSP00000328547	A2

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152070 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152070 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74272

Gnomad4 AFR AF: 0.0000242

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	11
DANN	Uncertain	0.98
DEOGEN2	Benign	0.081	T;.;.;.;.
Eigen	Benign	-0.72
Eigen_PC	Benign	-0.61
FATHMM_MKL	Benign	0.069	N
LIST_S2	Benign	0.77	T;T;T;T;T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.12	T;T;T;T;T
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	0.20	N;N;N;N;.
MutationTaster	Benign	1.0	D;N;N;N;N;N;N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-1.3	N;N;N;N;N
REVEL	Uncertain	0.33
Sift	Benign	0.25	T;T;T;T;T
Sift4G	Benign	0.36	T;T;T;T;T
Polyphen		0.0010	B;B;B;.;B
Vest4		0.27
MutPred		0.23		Loss of MoRF binding (P = 0.001);Loss of MoRF binding (P = 0.001);Loss of MoRF binding (P = 0.001);Loss of MoRF binding (P = 0.001);.;
MVP		0.75
MPC		0.37
ClinPred		0.17	T
GERP RS		2.0
Varity_R		0.23
gMVP		0.31

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: rs200902224; hg19: chr20-31372649;