Is SUN2 p.Arg450Trp (c.1348C>T) pathogenic?

SUN2 p.Arg450Trp (c.1348C>T) is classified Uncertain significance in SUN2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-03-27). AlphaMissense: likely benign (0.21); Very rare (popmax 0.00719%, nfe); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN2 p.Arg450Trp (c.1348C>T)?

SUN2 p.Arg450Trp (c.1348C>T) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN2 p.Arg450Trp (c.1348C>T) in the general population?

SUN2 p.Arg450Trp (c.1348C>T) is very rare (popmax 0.00719%, 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.Arg450Trp (c.1348C>T)?

AlphaMissense predicts likely benign (score 0.21) — an in-silico prediction, not a clinical call.

SUN2 p.Arg450Trp

c.1348C>T · rs749230478 · VCV2197828

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.21 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00719%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Emery-Dreifuss muscular dystrophy

⚠ Built without this gene's context — gene constraint and dosage, protein structure, pathways, panels and related-variant links were not looked up for this page. why

Computational evidence

Protein change
AlphaMissense	0.21	likely benign
REVEL	0.083	moderately benign-leaning
SaProt	LLR -10.05	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 2.8	GERP -4, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 12 kb · p 0.11 · regional, not allelic
Overall
CADD	20.5	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 0.00719% European (non-Finnish) · 84/1,167,850 alleles

Filtering AF 0.00594% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00546%

Overall 0.00553% 88/1,590,004 alleles · very rare exomes 86/1,437,856 · genomes 2/152,148 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00719%	13,903
Remaining individualsnot grpmax-eligible	0.00326%	30,631
East Asian	0.00226%	44,206
African / African-American	0.00134%	74,466

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.Arg450Trp
Coding: c.1348C>T
MANE Select: NM_015374
dbSNP: rs749230478
Type: single nucleotide variant
Location: chr22:38740275 (GRCh38)

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)

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-arg450trp (accessed [today's date]).

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