chr2-25247704-G-A

Variant names:

• chr2-25247704-G-A
• rs1553414070
• NM_022552.5:c.901C>T

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP5

The NM_022552.5(DNMT3A):​c.901C>T​(p.Arg301Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,332 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: DNMT3A NM_022552.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1 O:1
• Conservation: PhyloP100: 4.81
• Publications: 1 publications found

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)

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_022552.5
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-25247704-G-A is Pathogenic according to our data. Variant chr2-25247704-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 432039.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022552.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNMT3A	NM_022552.5	MANE Select	c.901C>T	p.Arg301Trp	missense	Exon 8 of 23	NP_072046.2
	DNMT3A	NM_175629.2		c.901C>T	p.Arg301Trp	missense	Exon 8 of 23	NP_783328.1
	DNMT3A	NM_001320893.1		c.445C>T	p.Arg149Trp	missense	Exon 3 of 18	NP_001307822.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DNMT3A	ENST00000321117.10	TSL:1 MANE Select	c.901C>T	p.Arg301Trp	missense	Exon 8 of 23	ENSP00000324375.5
	DNMT3A	ENST00000264709.7	TSL:1	c.901C>T	p.Arg301Trp	missense	Exon 8 of 23	ENSP00000264709.3
	DNMT3A	ENST00000380746.8	TSL:1	c.334C>T	p.Arg112Trp	missense	Exon 4 of 19	ENSP00000370122.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461332 Hom.: 0 Cov.: 32 AF XY: 0.00000413 AC XY: 3 AN XY: 726992

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52892

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111990

Other (OTH) AF: 0.00 AC: 0 AN: 60394

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000000223952), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

View on ClinVar

Computational scores

Other links and lift over

dbSNP: rs1553414070; hg19: chr2-25470573; COSMIC: COSV53046262;