Is SUN1 p.Pro419= (c.1257G>A) pathogenic?

SUN1 p.Pro419= (c.1257G>A) is classified Likely benign in SUN1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-09). Ultra-rare (popmax 0.0267%, eas); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN1 p.Pro419= (c.1257G>A)?

SUN1 p.Pro419= (c.1257G>A) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN1 p.Pro419= (c.1257G>A) in the general population?

SUN1 p.Pro419= (c.1257G>A) is ultra-rare (popmax 0.0267%, 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.Pro419=

c.1257G>A · rs370495368 · VCV1133737

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0267%, eas)

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.009	strongly benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.13	GERP -3.4
Overall
CADD	2.936	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0267% East Asian · 12/44,894 alleles

Filtering AF 0.0154% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0121%

Overall 0.00212% 34/1,601,420 alleles · ultra-rare exomes 30/1,449,172 · genomes 4/152,248 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0267%	3,741
Remaining individualsnot grpmax-eligible	0.00482%	20,757
Finnishnot grpmax-eligible	0.00189%	52,904
European (non-Finnish)	0.00153%	65,543

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.Pro419=
Coding: c.1257G>A
MANE Select: NM_001130965
dbSNP: rs370495368
Type: single nucleotide variant
Location: chr7:853612 (GRCh38)
Gene constraint: LOEUF 0.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.99 · 8 PDB

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.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
SUN1 p.Ala404Thr Uncertain significance ★★ same condition
SUN1 p.Ala414Thr 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-pro419 (accessed [today's date]).

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