2-25282442-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_ModerateBP7BS2_Supporting

The NM_022552.5(DNMT3A):c.447G>A(p.Ala149Ala) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000236 in 1,612,074 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

DNMT3A
NM_022552.5 splice_region, synonymous

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.434

Publications

0 publications found

Variant links:

Genes affected

DNMT3A (HGNC:2978): (DNA methyltransferase 3 alpha) 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 that is thought to function in de novo methylation, rather than maintenance methylation. The protein localizes to the cytoplasm and nucleus and its expression is developmentally regulated. [provided by RefSeq, Mar 2016]

DNMT3A Gene-Disease associations (from GenCC):

Tatton-Brown-Rahman overgrowth syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Illumina, Ambry Genetics, ClinGen, G2P, Orphanet, Labcorp Genetics (formerly Invitae)
Heyn-Sproul-Jackson syndrome
Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: Ambry Genetics, ClinGen, G2P, Labcorp Genetics (formerly Invitae)

DNMT3A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.33).

BP7

Synonymous conserved (PhyloP=0.434 with no splicing effect.

BS2

High AC in GnomAdExome4 at 35 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DNMT3A	NM_022552.5 link	c.447G>A	p.Ala149Ala	splice_region_variant, synonymous_variant	Exon 4 of 23	ENST00000321117.10	NP_072046.2	Q9Y6K1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
DNMT3A	ENST00000321117.10 link	c.447G>A	p.Ala149Ala	splice_region_variant, synonymous_variant	Exon 4 of 23	1	NM_022552.5	ENSP00000324375.5	Q9Y6K1-1
DNMT3A	ENST00000264709.7 link	c.447G>A	p.Ala149Ala	splice_region_variant, synonymous_variant	Exon 4 of 23	1		ENSP00000264709.3	Q9Y6K1-1
DNMT3A	ENST00000406659.3 link	c.447G>A	p.Ala149Ala	synonymous_variant	Exon 4 of 4	1		ENSP00000384852.3	Q9Y6K1-3
DNMT3A	ENST00000380756.7 link	n.447G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 4 of 24	1		ENSP00000370132.3	F8WE91

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152184

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000205

AC:

AN:

244142

AF XY:

0.0000150

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000292

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000479

Gnomad NFE exome

AF:

0.0000273

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000240

AC:

AN:

1459890

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

726180

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33450

American (AMR)

AF:

0.0000224

AC:

AN:

44632

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26106

East Asian (EAS)

AF:

0.00

AC:

AN:

39648

South Asian (SAS)

AF:

0.00

AC:

AN:

86106

European-Finnish (FIN)

AF:

0.0000573

AC:

AN:

52324

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

0.0000261

AC:

AN:

1111578

Other (OTH)

AF:

0.0000332

AC:

AN:

60306

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.468

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152184

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74342

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41444

American (AMR)

AF:

0.0000654

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00

AC:

AN:

4838

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68024

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.442

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Tatton-Brown-Rahman overgrowth syndrome

Uncertain:1

Feb 03, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change affects codon 149 of the DNMT3A mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the DNMT3A protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs763553315, gnomAD 0.008%). This variant has not been reported in the literature in individuals affected with DNMT3A-related conditions. ClinVar contains an entry for this variant (Variation ID: 475177). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.33

CADD

Benign

(source)

DANN

Benign

0.73

PhyloP100

0.43

Mutation Taster

=81/19

polymorphism

(source)

Splicing

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over