Is SLMAP p.Gly420= (c.1260C>T) pathogenic?

SLMAP p.Gly420= (c.1260C>T) is classified Conflicting classifications of pathogenicity in SLMAP (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2023-03-30). Very rare (popmax 0.00167%, amr); Associated with Brugada syndrome.

What condition is associated with SLMAP p.Gly420= (c.1260C>T)?

SLMAP p.Gly420= (c.1260C>T) is associated with Brugada syndrome (ClinVar).

How common is SLMAP p.Gly420= (c.1260C>T) in the general population?

SLMAP p.Gly420= (c.1260C>T) is very rare (popmax 0.00167%, amr) (gnomAD).

How is Brugada syndrome inherited?

Typically Autosomal dominant, Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

SLMAP p.Gly420=

c.1260C>T · rs777858277 · VCV1735829

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

Brugada syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.27	donor loss, 40 bp away · masked 0 · deltas
Pangolin	Δ0.24	loss · gain 0.00 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 1.9	GERP 0.76, phastCons 1
Overall
CADD	10.86	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,954 alleles

Filtering AF 0.000247% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000159%

Overall 0.000558% 9/1,612,402 alleles · very rare exomes 8/1,460,360 · genomes 1/152,042 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,954
South Asian	0.0011%	91,032
European (non-Finnish)	0.000594%	168,404

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: SLMAP
Protein: p.Gly420=
Coding: c.1260C>T
MANE Select: NM_001377540
dbSNP: rs777858277
Type: single nucleotide variant
Location: chr3:57871658 (GRCh38)
Gene constraint: LOEUF 0.531 · pLI 0.86 (gnomAD)
Structure: AlphaFold pLDDT 77.74 · 3 PDB

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

Disease context

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

For Brugada syndrome (Orphanet):

Inheritance: Autosomal dominant, Not applicable
Onset: Adult, Childhood
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

SLMAP p.Gly420Ser Uncertain significance ★★ ⚠ same residue
SLMAP c.*38C>T Uncertain significance ★★ ⚠ same condition
SLMAP c.*55G>A Uncertain significance ★★ ⚠ same condition
SLMAP c.*70G>A Uncertain significance ★★ ⚠ same condition
SLMAP p.Ala365Asp Uncertain significance ★★ ⚠ same condition
SLMAP p.Ala506Ser Uncertain significance ★★ ⚠ same condition
SLMAP p.Ala597Val Uncertain significance ★★ ⚠ same condition
SLMAP p.Arg136Gln 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/slmap-p-gly420 (accessed [today's date]).

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