Is DNMT1 p.Gln326Pro (c.977A>C) pathogenic?

DNMT1 p.Gln326Pro (c.977A>C) is classified Benign/Likely benign in DNMT1 (ClinVar, Multiple submitters, 7 submitters; last evaluated 2025-12-14). AlphaMissense: likely benign (0.0708); Ultra-rare (popmax 0.033%, mid); Associated with hereditary sensory neuropathy-deafness-dementia syndrome.

What condition is associated with DNMT1 p.Gln326Pro (c.977A>C)?

DNMT1 p.Gln326Pro (c.977A>C) is associated with hereditary sensory neuropathy-deafness-dementia syndrome (ClinVar).

How common is DNMT1 p.Gln326Pro (c.977A>C) in the general population?

DNMT1 p.Gln326Pro (c.977A>C) is ultra-rare (popmax 0.033%, mid) (gnomAD).

What do computational predictors say about DNMT1 p.Gln326Pro (c.977A>C)?

AlphaMissense predicts likely benign (score 0.0708) — an in-silico prediction, not a clinical call.

DNMT1 p.Gln326Pro

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.977A>C · rs143287044 · VCV327919

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 7 submitters

AlphaMissense

likely benign

0.0708 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.033%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary sensory neuropathy-deafness-dementia syndrome

Computational evidence

Protein change
AlphaMissense	0.0708	likely benign
REVEL	0.081	moderately benign-leaning
SaProt	LLR -5.89	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.1	GERP 7.2, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 35 kb · p 0.0067 · regional, not allelic
Overall
CADD	17.54	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 Q310P vs ClinVar Q326P) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.033% Middle Eastern · 2/6,060 alleles

Filtering AF 0.0173% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0165%

Overall 0.0166% 268/1,613,648 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.033%	3,030
Finnishnot grpmax-eligible	0.0251%	3,990
Remaining individualsnot grpmax-eligible	0.0208%	4,806
European (non-Finnish)	0.0194%	5,152
South Asian	0.00659%	15,178
Admixed American	0.00167%	59,978
African / African-American	0.00133%	74,948

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: DNMT1
Protein: p.Gln326Pro
Coding: c.977A>C
MANE Select: NM_001130823
dbSNP: rs143287044
Type: single nucleotide variant
Location: chr19:10162698 (GRCh38)
Gene constraint: LOEUF 0.15 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 77.88 · 29 PDB
Residue 326: the 'interaction with the prc2/eed-ezh2 complex' region; the 'disordered' region; the 'homodimerization' region

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.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
DNMT1 c.*211G>C Uncertain significance ★★ same condition
DNMT1 c.*253G>A Uncertain significance ★★ same condition
DNMT1 p.Ala1053Thr 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-gln326pro (accessed [today's date]).

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