Is SUN1 p.Phe300Val (c.898T>G) pathogenic?

SUN1 p.Phe300Val (c.898T>G) is classified Uncertain significance in SUN1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-11-13). Very rare (popmax 0.00712%, nfe); Associated with Emery-Dreifuss muscular dystrophy.

What condition is associated with SUN1 p.Phe300Val (c.898T>G)?

SUN1 p.Phe300Val (c.898T>G) is associated with Emery-Dreifuss muscular dystrophy (ClinVar).

How common is SUN1 p.Phe300Val (c.898T>G) in the general population?

SUN1 p.Phe300Val (c.898T>G) is very rare (popmax 0.00712%, 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.

SUN1 p.Phe300Val

c.898T>G · rs371348168 · VCV2043216

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00712%, nfe)

Conditions

Emery-Dreifuss muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
REVEL	0.075	moderately benign-leaning
Splicing
SpliceAI	Δ0.21	acceptor loss, 13 bp away · masked 0 · deltas
Constraint at this position
Conservation	phyloP -0.28	GERP -3.8
Regional constraint	o/e 1.09	unconstrained · MANE · 28 kb · p 0.01 · regional, not allelic
Overall
CADD	10.22	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00712% European (non-Finnish) · 84/1,180,056 alleles

Filtering AF 0.00588% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00541%

Overall 0.00539% 87/1,614,124 alleles · very rare exomes 80/1,461,892 · genomes 7/152,232 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00712%	14,048
African / African-American	0.00267%	37,470
Remaining individualsnot grpmax-eligible	0.0016%	62,486

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.Phe300Val
Coding: c.898T>G
MANE Select: NM_001130965
dbSNP: rs371348168
Type: single nucleotide variant
Location: chr7:852655 (GRCh38)
Gene constraint: LOEUF 0.712 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.99 · 8 PDB
Residue 300: the 'syne2-binding' region; the 'emd-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.Phe300Leu Conflicting classifications of pathogenicity ★ same residue
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

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-phe300val (accessed [today's date]).

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