Is DNMT1 p.Cys1237= (c.3711C>T) pathogenic?

DNMT1 p.Cys1237= (c.3711C>T) is classified Likely benign in DNMT1 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-12-14). Ultra-rare (popmax 0.0601%, eas); Associated with hereditary sensory neuropathy-deafness-dementia syndrome.

What condition is associated with DNMT1 p.Cys1237= (c.3711C>T)?

DNMT1 p.Cys1237= (c.3711C>T) is associated with hereditary sensory neuropathy-deafness-dementia syndrome, autosomal dominant cerebellar ataxia, deafness and narcolepsy (ClinVar).

How common is DNMT1 p.Cys1237= (c.3711C>T) in the general population?

DNMT1 p.Cys1237= (c.3711C>T) is ultra-rare (popmax 0.0601%, eas) (gnomAD).

DNMT1 p.Cys1237=

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.3711C>T · rs139909192 · VCV1102656

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0601%, eas)

Conditions

hereditary sensory neuropathy-deafness-dementia 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 -10	GERP -4.2
Overall
CADD	0.248	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0601% East Asian · 27/44,894 alleles

Filtering AF 0.0424% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0365%

Overall 0.011% 177/1,613,804 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0601%	1,663
Remaining individualsnot grpmax-eligible	0.0112%	8,927
European (non-Finnish)	0.011%	9,077
Finnishnot grpmax-eligible	0.011%	9,107
African / African-American	0.00667%	14,988
South Asian	0.0011%	91,090

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.Cys1237=
Coding: c.3711C>T
MANE Select: NM_001130823
dbSNP: rs139909192
Type: single nucleotide variant
Location: chr19:10140141 (GRCh38)
Gene constraint: LOEUF 0.15 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 77.88 · 29 PDB
Residue 1237: the sam-dependent mtase c5-type domain; an α-helix; the 'interaction with the prc2/eed-ezh2 complex' 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

Also linked: autosomal dominant cerebellar ataxia, deafness and narcolepsy

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-cys1237 (accessed [today's date]).

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