Is SUN2 p.Leu89Arg (c.266T>G) pathogenic?

SUN2 p.Leu89Arg (c.266T>G) is classified Benign in SUN2 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-02-01). AlphaMissense: likely benign (0.0712); Common (popmax 11.1%, nfe) — too common for a highly-penetrant pathogenic allele; Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN2 p.Leu89Arg (c.266T>G)?

SUN2 p.Leu89Arg (c.266T>G) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

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.Leu89Arg (c.266T>G)?

AlphaMissense predicts likely benign (score 0.0712) — an in-silico prediction, not a clinical call.

SUN2 p.Leu89Arg

Q: How common is SUN2 p.Leu89Arg (c.266T>G) in the general population?

SUN2 p.Leu89Arg (c.266T>G) is common (popmax 11.1%, nfe) — too common for a highly-penetrant pathogenic allele (gnomAD).

c.266T>G · rs35496634 · VCV1167140

Benign Multiple submitters

Classification

Benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0712 · ACMG-weighted

gnomAD v4.1

Common

common (popmax 11.1%, nfe) — too common for a highly-penetrant pathogenic allele

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
AlphaMissense	0.0712	likely benign
REVEL	0.079	moderately benign-leaning
SaProt	LLR -6.21	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.8	GERP 1.8, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 12 kb · p 0.11 · regional, not allelic
Overall
CADD	20.3	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 11.1% European (non-Finnish) · 130,400/1,179,126 alleles

Filtering AF 11% ClinGen BA1/BS1 input FAF95, joint · FAF99 11%

Overall 9.54% 153,866/1,613,000 alleles · common exomes 142,245/1,460,736 · genomes 11,621/152,264 · joint denominator

Ancestry group	Frequency	1 in
Amishnot grpmax-eligible	23.2%	4
Finnishnot grpmax-eligible	14.2%	7
European (non-Finnish)grpmax	11.1%	9
Ashkenazi Jewishnot grpmax-eligible	8.65%	12
Remaining individualsnot grpmax-eligible	8.54%	12
Middle Eastern	7.21%	14
Admixed American	5.01%	20
African / African-American	1.76%	57
South Asian	1.63%	61
East Asian	0.0245%	4,077

Amish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Leu89Arg
Coding: c.266T>G
MANE Select: NM_015374
dbSNP: rs35496634
Type: single nucleotide variant
Location: chr22:38751230 (GRCh38)
Gene constraint: LOEUF 0.756 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 68.48 · 9 PDB
Residue 89: a UniProt-annotated variant site (in); 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.Leu89Trp 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-leu89arg (accessed [today's date]).

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