Is SUN2 p.Ser85= (c.255C>G) pathogenic?

SUN2 p.Ser85= (c.255C>G) is classified Likely benign in SUN2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-26). Ultra-rare (popmax 0.0187%, afr); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN2 p.Ser85= (c.255C>G)?

SUN2 p.Ser85= (c.255C>G) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN2 p.Ser85= (c.255C>G) in the general population?

SUN2 p.Ser85= (c.255C>G) is ultra-rare (popmax 0.0187%, afr) (gnomAD).

How is Emery-Dreifuss muscular dystrophy inherited?

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

SUN2 p.Ser85=

c.255C>G · VCV3688575

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0187%, afr)

Conditions

Emery-Dreifuss muscular dystrophy

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 3.8	GERP 2.2, phastCons 1
Overall
CADD	8.05	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0187% African / African-American · 14/75,034 alleles

Filtering AF 0.0112% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00903%

Overall 0.00093% 15/1,613,738 alleles · ultra-rare exomes 4/1,461,428 · genomes 11/152,310 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0187%	5,360
Admixed American	0.00167%	60,004

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: SUN2
Protein: p.Ser85=
Coding: c.255C>G
MANE Select: NM_015374
Type: single nucleotide variant
Location: chr22:38751241 (GRCh38)
Gene constraint: LOEUF 0.756 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 68.48 · 9 PDB
Residue 85: the 'lmna-binding' region

Full SUN2 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

SUN2 p.Ser85Tyr Uncertain significance ★ ⚠ same residue
SUN2 p.Ala158Thr Uncertain significance ★★ ⚠ same condition
SUN2 p.Ala251Val Uncertain significance ★★ ⚠ same condition
SUN2 p.Ala508Val Uncertain significance ★★ ⚠ same condition
SUN2 p.Ala56Val Uncertain significance ★★ ⚠ same condition
SUN2 p.Arg100Gln Uncertain significance ★★ ⚠ same condition
SUN2 p.Arg102Gln Uncertain significance ★★ ⚠ same condition
SUN2 p.Arg102Trp 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/sun2-p-ser85 (accessed [today's date]).

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