Is SUN2 p.Arg102Gln (c.305G>A) pathogenic?

SUN2 p.Arg102Gln (c.305G>A) is classified Uncertain significance in SUN2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-27). AlphaMissense: likely benign (0.1187); Very rare (popmax 0.00687%, nfe); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN2 p.Arg102Gln (c.305G>A)?

SUN2 p.Arg102Gln (c.305G>A) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN2 p.Arg102Gln (c.305G>A) in the general population?

SUN2 p.Arg102Gln (c.305G>A) is very rare (popmax 0.00687%, nfe) (gnomAD).

How is Emery-Dreifuss muscular dystrophy inherited?

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

What do computational predictors say about SUN2 p.Arg102Gln (c.305G>A)?

AlphaMissense predicts likely benign (score 0.1187) — an in-silico prediction, not a clinical call.

SUN2 p.Arg102Gln

c.305G>A · rs373600095 · VCV2507500

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1187 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00687%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
AlphaMissense	0.1187	likely benign
REVEL	0.162	moderately benign-leaning
SaProt	LLR -10.17	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.6	GERP 2.1, phastCons 0.99
Regional constraint	o/e 0.94	unconstrained · MANE · 12 kb · p 0.11 · regional, not allelic
Overall
CADD	29.9	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00687% European (non-Finnish) · 81/1,179,732 alleles

Filtering AF 0.00563% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00515%

Overall 0.00558% 90/1,613,178 alleles · very rare exomes 84/1,460,960 · genomes 6/152,218 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00687%	14,565
Remaining individualsnot grpmax-eligible	0.00481%	20,809
African / African-American	0.004%	24,976
East Asian	0.00223%	44,866
Finnishnot grpmax-eligible	0.00157%	63,692
South Asian	0.0011%	91,014

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.Arg102Gln
Coding: c.305G>A
MANE Select: NM_015374
dbSNP: rs373600095
Type: single nucleotide variant
Location: chr22:38751017 (GRCh38)
Gene constraint: LOEUF 0.756 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 68.48 · 9 PDB
Residue 102: 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.Arg102Trp Uncertain significance ★★ ⚠ same residue
SUN2 p.Arg102= Likely benign ★ 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.Arg104Lys 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-arg102gln (accessed [today's date]).

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