Is SIM1 p.Leu27= (c.79C>T) pathogenic?

SIM1 p.Leu27= (c.79C>T) is classified Likely benign in SIM1 (ClinVar, No assertion criteria, 1 submitter; last evaluated 2024-05-02). Very rare (popmax 0.000169%, nfe); Associated with SIM1-related disorder.

What condition is associated with SIM1 p.Leu27= (c.79C>T)?

SIM1 p.Leu27= (c.79C>T) is associated with SIM1-related disorder (ClinVar).

How common is SIM1 p.Leu27= (c.79C>T) in the general population?

SIM1 p.Leu27= (c.79C>T) is very rare (popmax 0.000169%, nfe) (gnomAD).

SIM1 p.Leu27=

c.79C>T · VCV3355345

Likely benign No assertion criteria

Classification

Likely benign

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.000169%, nfe)

Conditions

SIM1-related disorder

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 2.8	GERP -0.24, phastCons 1
Overall
CADD	10.84	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000169% European (non-Finnish) · 2/1,179,994 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,614,126 alleles · very rare exomes 2/1,461,832 · genomes 0/152,294 · joint denominator

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: SIM1
Protein: p.Leu27=
Coding: c.79C>T
MANE Select: NM_005068
Type: single nucleotide variant
Location: chr6:100463390 (GRCh38)
Gene constraint: LOEUF 0.332 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 60.70
Residue 27: the bhlh domain

Full SIM1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

SIM1-related disorder

Similar variants

SIM1 p.Arg374Trp Uncertain significance ★★ ⚠ same condition
SIM1 p.Ser199Cys Uncertain significance ★★ same condition
SIM1 p.Gly480Ter Likely pathogenic ★ same condition
SIM1 c.-468+6T>A Uncertain significance ★ same condition
SIM1 p.Ala484Ser Uncertain significance ★ ⚠ same condition
SIM1 p.Asn608Asp Uncertain significance ★ ⚠ same condition
SIM1 p.Lys287Arg Uncertain significance ★ ⚠ same condition
SIM1 p.Pro30Ala 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/sim1-p-leu27 (accessed [today's date]).

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