Is CHAT p.Thr286= (c.858C>T) pathogenic?

CHAT p.Thr286= (c.858C>T) is classified Conflicting classifications of pathogenicity in CHAT (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2026-01-12). Ultra-rare (popmax 0.0889%, amr); Associated with congenital myasthenic syndrome 6.

What condition is associated with CHAT p.Thr286= (c.858C>T)?

CHAT p.Thr286= (c.858C>T) is associated with congenital myasthenic syndrome 6 (ClinVar).

How common is CHAT p.Thr286= (c.858C>T) in the general population?

CHAT p.Thr286= (c.858C>T) is ultra-rare (popmax 0.0889%, amr) (gnomAD).

CHAT p.Thr286=

c.858C>T · rs200423662 · VCV725904

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0889%, amr)

Conditions

congenital myasthenic syndrome 6

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 -0.37	GERP -4.7
Overall
CADD	6.16	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0889% Admixed American · 53/59,602 alleles

Filtering AF 0.0698% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.063%

Overall 0.00391% 63/1,610,816 alleles · ultra-rare exomes 24/1,458,478 · genomes 39/152,338 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0889%	1,125
Remaining individualsnot grpmax-eligible	0.0144%	6,932
African / African-American	0.00133%	75,000

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: CHAT
Protein: p.Thr286=
Coding: c.858C>T
MANE Select: NM_020549
dbSNP: rs200423662
Type: single nucleotide variant
Location: chr10:49625578 (GRCh38)
Gene constraint: LOEUF 0.973 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 84.73 · 8 PDB
Residue 286: a β-strand

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

Disease context

congenital myasthenic syndrome 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CHAT p.Thr286Ser Uncertain significance ★ ⚠ same residue
SLC18A3 p.Met286Val Uncertain significance ★ ⚠ same residue
CHAT c.1282-2A>T Likely pathogenic ★★ same condition
CHAT c.1840-9A>G Pathogenic/Likely pathogenic ★★ same condition
CHAT c.698+1G>T Likely pathogenic ★★ same condition
CHAT c.698+2T>C Likely pathogenic ★★ same condition
CHAT p.Ala557Thr Pathogenic/Likely pathogenic ★★ same condition
CHAT p.Arg151Ter 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/chat-p-thr286 (accessed [today's date]).

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