Is SUN1 p.Lys84Arg (c.251A>G) pathogenic?

SUN1 p.Lys84Arg (c.251A>G) is classified Uncertain significance in SUN1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-12-20). Very rare (popmax 0.00177%, amr); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN1 p.Lys84Arg (c.251A>G)?

SUN1 p.Lys84Arg (c.251A>G) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN1 p.Lys84Arg (c.251A>G) in the general population?

SUN1 p.Lys84Arg (c.251A>G) is very rare (popmax 0.00177%, amr) (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.Lys84Arg

c.251A>G · rs1806257586 · VCV2956297

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00177%, amr)

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.014	strongly benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.47	GERP 0.46, phastCons 0.002
Regional constraint	o/e 1.09	unconstrained · MANE · 28 kb · p 0.01 · regional, not allelic
Overall
CADD	4.19	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00177% Admixed American · 1/56,552 alleles

Overall 6.28e-05% 1/1,592,282 alleles · very rare exomes 0/1,440,084 · genomes 1/152,198 · joint denominator

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.Lys84Arg
Coding: c.251A>G
MANE Select: NM_001130965
dbSNP: rs1806257586
Type: single nucleotide variant
Location: chr7:838971 (GRCh38)
Gene constraint: LOEUF 0.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.99 · 8 PDB
Residue 84: 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.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-lys84arg (accessed [today's date]).

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