Is DNMT1 p.Arg1226Pro (c.3677G>C) pathogenic?

DNMT1 p.Arg1226Pro (c.3677G>C) is classified Uncertain significance in DNMT1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-03). AlphaMissense: ambiguous (0.3774); Absent from gnomAD v4.1; Associated with hereditary sensory neuropathy-deafness-dementia syndrome.

What condition is associated with DNMT1 p.Arg1226Pro (c.3677G>C)?

DNMT1 p.Arg1226Pro (c.3677G>C) is associated with hereditary sensory neuropathy-deafness-dementia syndrome (ClinVar).

How common is DNMT1 p.Arg1226Pro (c.3677G>C) in the general population?

DNMT1 p.Arg1226Pro (c.3677G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about DNMT1 p.Arg1226Pro (c.3677G>C)?

AlphaMissense predicts ambiguous (score 0.3774) — an in-silico prediction, not a clinical call.

DNMT1 p.Arg1226Pro

Q: How is Hereditary sensory neuropathy-deafness-dementia syndrome inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

c.3677G>C · rs753205659 · VCV2763148

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3774 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

hereditary sensory neuropathy-deafness-dementia syndrome

Computational evidence

Protein change
AlphaMissense	0.3774	ambiguous
REVEL	0.466	indeterminate
SaProt	LLR -8.96	tolerated
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.1	GERP -0.19, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 54 bp · p 0.54 · regional, not allelic
Overall
CADD	23.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM R1210P vs ClinVar R1226P) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: DNMT1
Protein: p.Arg1226Pro
Coding: c.3677G>C
MANE Select: NM_001130823
dbSNP: rs753205659
Type: single nucleotide variant
Location: chr19:10140175 (GRCh38)
Gene constraint: LOEUF 0.15 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 77.88 · 29 PDB
Residue 1226: the sam-dependent mtase c5-type domain; the 'interaction with the prc2/eed-ezh2 complex' region; an active site

Full DNMT1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary sensory neuropathy-deafness-dementia syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Hereditary sensory neuropathy-deafness-dementia syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult

Similar variants

DNMT1 p.Arg1226Gln Uncertain significance ★★ ⚠ same residue
DNMT1 p.Arg1226= Conflicting classifications of pathogenicity ★ same residue
DNMT1 p.Arg1226Trp Uncertain significance ★ ⚠ same residue
DNMT1 p.Ala570Val Pathogenic ★★ ⚠ same condition
DNMT1 p.Tyr511Cys Pathogenic/Likely pathogenic ★★ same condition
DNMT1 c.1280+2T>C Uncertain significance ★★ same condition
DNMT1 c.3524-5G>T Uncertain significance ★★ same condition
DNMT1 c.494-4A>G Uncertain significance ★★ 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/dnmt1-p-arg1226pro (accessed [today's date]).

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