DNMT3B p.Pro740=
c.2220C>T · rs745978104 · VCV2959292
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00223%, eas)
Conditions
1
immunodeficiency-centromeric instability-facial anomalies syndrome
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -5.8 | GERP -3.8 |
| Overall | ||
| CADD | 4.827 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00223%
East Asian · 1/44,882 alleles
Filtering AF
0.000365%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000136%
Overall
0.000496%
8/1,614,188 alleles · very rare
exomes 7/1,461,888 · genomes 1/152,300 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| East Asiangrpmax | 0.00223% | 44,882 |
| South Asian | 0.0022% | 45,543 |
| African / African-American | 0.00133% | 75,030 |
| European (non-Finnish) | 0.000339% | 295,010 |
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
- DNMT3B
- Protein
- p.Pro740=
- Coding
- c.2220C>T
- MANE Select
- NM_006892
- dbSNP
- rs745978104
- Type
- single nucleotide variant
- Location
- chr20:32802459 (GRCh38)
- Gene constraint
- LOEUF 0.396 · pLI 1.00 (gnomAD)
- Structure
- AlphaFold pLDDT 73.18 · 47 PDB
- Residue 740
- a turn; the sam-dependent mtase c5-type domain
Similar variants
- DNMT3B c.2421-11G>A Pathogenic/Likely pathogenic ★★ same condition
- DNMT3B p.Ala603Thr Pathogenic/Likely pathogenic ★★ same condition
- DNMT3B p.Arg826Cys Pathogenic/Likely pathogenic ★★ same condition
- DNMT3B p.Arg840Gln Likely pathogenic ★★ same condition
- DNMT3B p.Asp653Asn Pathogenic/Likely pathogenic ★★ same condition
- DNMT3B p.His814Arg Likely pathogenic ★★ ⚠ same condition
- DNMT3B p.Val613Ala Pathogenic/Likely pathogenic ★★ same condition
- DNMT3B p.Val726Gly 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/dnmt3b-p-pro740 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown