Is SUN1 p.Arg86Pro (c.257G>C) pathogenic?

SUN1 p.Arg86Pro (c.257G>C) is classified Benign/Likely benign in SUN1 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-26). Rare (popmax 0.737%, eas); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN1 p.Arg86Pro (c.257G>C)?

SUN1 p.Arg86Pro (c.257G>C) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN1 p.Arg86Pro (c.257G>C) in the general population?

SUN1 p.Arg86Pro (c.257G>C) is rare (popmax 0.737%, eas) (gnomAD).

How is Emery-Dreifuss muscular dystrophy inherited?

Typically Autosomal dominant, Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

SUN1 p.Arg86Pro

c.257G>C · rs375668872 · VCV703907

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

rare (popmax 0.737%, eas)

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.169	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.3	GERP -2.8, phastCons 0.004
Regional constraint	o/e 1.09	unconstrained · MANE · 28 kb · p 0.01 · regional, not allelic
Overall
CADD	17.95	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.737% East Asian · 326/44,214 alleles

Filtering AF 0.671% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.646%

Overall 0.0285% 451/1,584,970 alleles · rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.737%	136
Remaining individualsnot grpmax-eligible	0.158%	633
South Asian	0.0139%	7,219
Admixed American	0.0126%	7,922
African / African-American	0.00671%	14,909
European (non-Finnish)	0.000343%	291,766

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: SUN1
Protein: p.Arg86Pro
Coding: c.257G>C
MANE Select: NM_001130965
dbSNP: rs375668872
Type: single nucleotide variant
Location: chr7:838977 (GRCh38)
Gene constraint: LOEUF 0.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.99 · 8 PDB
Residue 86: the 'lmna-binding' region

Full SUN1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Emery-Dreifuss muscular dystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Emery-Dreifuss muscular dystrophy (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Childhood
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

SUN1 p.Arg86Gln Uncertain significance ★ same residue
SUN1 p.Arg86= Likely benign ★ same residue
SUN1 p.Ala179Thr Uncertain significance ★★ same condition
SUN1 p.Ala203Thr Uncertain significance ★★ same condition
SUN1 p.Ala232Val Uncertain significance ★★ same condition
SUN1 p.Ala236Thr Uncertain significance ★★ same condition
SUN1 p.Ala255Thr Uncertain significance ★★ same condition
SUN1 p.Ala256Val 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/sun1-p-arg86pro (accessed [today's date]).

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