Genetic Variant DNMT3B:c.2232-1227G>C (chr20-32804111-G-C) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The NM_006892.4(DNMT3B):c.2232-1227G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0729 in 152,238 control chromosomes in the GnomAD database, including 1,229 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.073 ( 1229 hom., cov: 32)

Consequence

DNMT3B
NM_006892.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.99

Publications

1 publications found

Variant links:

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

DNMT3B links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.92).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.24 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNMT3B	NM_006892.4 link	c.2232-1227G>C		intron_variant	Intron 20 of 22	ENST00000328111.6	NP_008823.1	Q9UBC3-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DNMT3B	ENST00000328111.6 link	c.2232-1227G>C		intron_variant	Intron 20 of 22	1	NM_006892.4	ENSP00000328547.2		Q9UBC3-1

Frequencies

GnomAD3 genomes

AF:

0.0727

AC:

11054

AN:

152120

Hom.:

1222

Cov.:

show subpopulations

Gnomad AFR

AF:

0.244

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0336

Gnomad ASJ

AF:

0.0124

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00331

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.0759

Gnomad NFE

AF:

0.00325

Gnomad OTH

AF:

0.0685

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome

AF:

0.0729

AC:

11093

AN:

152238

Hom.:

1229

Cov.:

AF XY:

0.0708

AC XY:

5270

AN XY:

74458

show subpopulations

African (AFR)

AF:

0.244

AC:

10136

AN:

41472

American (AMR)

AF:

0.0336

AC:

514

AN:

15302

Ashkenazi Jewish (ASJ)

AF:

0.0124

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00248

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.0816

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00325

AC:

221

AN:

68032

Other (OTH)

AF:

0.0678

AC:

143

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

430

859

1289

1718

2148

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

102

204

306

408

510

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0592

Hom.:

108

Bravo

AF:

0.0843

Asia WGS

AF:

0.0220

AC:

AN:

3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.92

CADD

Benign

0.041

(source)

DANN

Benign

0.43

PhyloP100

-2.0

Mutation Taster

=100/0

polymorphism (auto)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over