Is DNMT3A p.Ser770= (c.2310G>A) pathogenic?

DNMT3A p.Ser770= (c.2310G>A) is classified Likely benign in DNMT3A (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-11-28). Very rare (popmax 0.00768%, sas); Associated with Tatton-Brown-Rahman overgrowth syndrome.

What condition is associated with DNMT3A p.Ser770= (c.2310G>A)?

DNMT3A p.Ser770= (c.2310G>A) is associated with Tatton-Brown-Rahman overgrowth syndrome (ClinVar).

How common is DNMT3A p.Ser770= (c.2310G>A) in the general population?

DNMT3A p.Ser770= (c.2310G>A) is very rare (popmax 0.00768%, sas) (gnomAD).

DNMT3A p.Ser770=

c.2310G>A · rs143068605 · VCV2886898

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00768%, sas)

Conditions

Tatton-Brown-Rahman overgrowth syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -6.2	GERP -3.7
Overall
CADD	8.303	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00768% South Asian · 7/91,090 alleles

Filtering AF 0.00359% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00255%

Overall 0.00186% 30/1,614,054 alleles · very rare exomes 26/1,461,858 · genomes 4/152,196 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00768%	13,013
Admixed American	0.005%	20,002
Remaining individualsnot grpmax-eligible	0.0032%	31,243
East Asian	0.00223%	44,894
European (non-Finnish)	0.00144%	69,414

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: DNMT3A
Protein: p.Ser770=
Coding: c.2310G>A
MANE Select: NM_022552
dbSNP: rs143068605
Type: single nucleotide variant
Location: chr2:25240314 (GRCh38)
Gene constraint: LOEUF 1.998 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 73.97 · 47 PDB
Residue 770: an α-helix; the sam-dependent mtase c5-type domain

Full DNMT3A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Tatton-Brown-Rahman overgrowth syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

DNMT3A p.Ser770Leu Pathogenic ★★ same residue
DNMT3A c.1667+1G>A Likely pathogenic ★★ same condition
DNMT3A c.1937-2A>G Pathogenic ★★ same condition
DNMT3A c.2478+1G>A Pathogenic/Likely pathogenic ★★ same condition
DNMT3A c.2479-1G>A Likely pathogenic ★★ same condition
DNMT3A p.Arg143Ter Pathogenic ★★ same condition
DNMT3A p.Arg320Ter Pathogenic/Likely pathogenic ★★ same condition
DNMT3A p.Arg598Ter Pathogenic/Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/dnmt3a-p-ser770 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown