Is SUN2 p.His678= (c.2034C>T) pathogenic?

SUN2 p.His678= (c.2034C>T) is classified Likely benign in SUN2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-05-23). Ultra-rare (popmax 0.0823%, sas); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN2 p.His678= (c.2034C>T)?

SUN2 p.His678= (c.2034C>T) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN2 p.His678= (c.2034C>T) in the general population?

SUN2 p.His678= (c.2034C>T) is ultra-rare (popmax 0.0823%, sas) (gnomAD).

How is Emery-Dreifuss muscular dystrophy inherited?

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

SUN2 p.His678=

c.2034C>T · rs539775471 · VCV1602290

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0823%, sas)

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
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP -0.65	GERP -4.5
Overall
CADD	4.017	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0823% South Asian · 75/91,086 alleles

Filtering AF 0.0673% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0617%

Overall 0.00496% 80/1,613,980 alleles · ultra-rare exomes 77/1,461,660 · genomes 3/152,320 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0823%	1,214
Remaining individualsnot grpmax-eligible	0.0048%	20,831
African / African-American	0.00133%	75,042
European (non-Finnish)	8.47e-05%	1,179,974

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.His678=
Coding: c.2034C>T
MANE Select: NM_015374
dbSNP: rs539775471
Type: single nucleotide variant
Location: chr22:38738179 (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-his678 (accessed [today's date]).

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