Is SIM1 p.Leu655= (c.1963C>T) pathogenic?

SIM1 p.Leu655= (c.1963C>T) is classified Likely benign in SIM1 (ClinVar, No assertion criteria, 1 submitter; last evaluated 2019-08-23). Very rare (popmax 0.005%, amr); Associated with SIM1-related disorder.

What condition is associated with SIM1 p.Leu655= (c.1963C>T)?

SIM1 p.Leu655= (c.1963C>T) is associated with SIM1-related disorder (ClinVar).

How common is SIM1 p.Leu655= (c.1963C>T) in the general population?

SIM1 p.Leu655= (c.1963C>T) is very rare (popmax 0.005%, amr) (gnomAD).

SIM1 p.Leu655=

c.1963C>T · VCV3356896

Likely benign No assertion criteria

Classification

Likely benign

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

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 5.1	GERP -0.27, phastCons 1
Overall
CADD	3.464	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.005% Admixed American · 3/59,998 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000668%

Overall 0.00031% 5/1,614,058 alleles · very rare exomes 4/1,461,878 · genomes 1/152,180 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	19,999
African / African-American	0.00267%	37,467

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.Leu655=
Coding: c.1963C>T
MANE Select: NM_005068
Type: single nucleotide variant
Location: chr6:100390699 (GRCh38)
Gene constraint: LOEUF 0.332 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 60.70
Residue 655: the single-minded c-terminal 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-leu655 (accessed [today's date]).

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