Is PLEC p.Ser3306= (c.9918C>T) pathogenic?

PLEC p.Ser3306= (c.9918C>T) is classified Benign/Likely benign in PLEC (ClinVar, Multiple submitters, 4 submitters; last evaluated 2023-12-22). Ultra-rare (popmax 0.0571%, sas); Associated with epidermolysis bullosa simplex 5B, with muscular dystrophy.

What condition is associated with PLEC p.Ser3306= (c.9918C>T)?

PLEC p.Ser3306= (c.9918C>T) is associated with epidermolysis bullosa simplex 5B, with muscular dystrophy, epidermolysis bullosa simplex 5A, Ogna type, epidermolysis bullosa simplex 5C, with pyloric atresia (ClinVar).

How common is PLEC p.Ser3306= (c.9918C>T) in the general population?

PLEC p.Ser3306= (c.9918C>T) is ultra-rare (popmax 0.0571%, sas) (gnomAD).

PLEC p.Ser3306=

Q: How is Epidermolysis bullosa simplex with muscular dystrophy inherited?

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

c.9918C>T · rs112205689 · VCV507465

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0571%, sas)

Conditions

epidermolysis bullosa simplex 5B, with muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -9.3
Overall
CADD	0.091	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0571% South Asian · 52/91,088 alleles

Filtering AF 0.0447% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0403%

Overall 0.00781% 126/1,613,072 alleles · ultra-rare exomes 117/1,460,744 · genomes 9/152,328 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0571%	1,752
African / African-American	0.016%	6,254
Admixed American	0.00999%	10,006
Remaining individualsnot grpmax-eligible	0.0096%	10,416
East Asian	0.00446%	22,439
European (non-Finnish)	0.00398%	25,107
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,604

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: PLEC
Protein: p.Ser3306=
Coding: c.9918C>T
MANE Select: NM_201384
dbSNP: rs112205689
Type: single nucleotide variant
Location: chr8:143919903 (GRCh38)
Gene constraint: LOEUF 0.726 · pLI <0.01 (gnomAD)
Residue 3306: the 'required for interaction with intermediate filament proteins' region; the 'globular 2' region

Full PLEC gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

epidermolysis bullosa simplex 5B, with muscular dystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: epidermolysis bullosa simplex 5A, Ogna type epidermolysis bullosa simplex 5C, with pyloric atresia autosomal recessive limb-girdle muscular dystrophy type 2Q epidermolysis bullosa simplex with nail dystrophy

For Epidermolysis bullosa simplex with muscular dystrophy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

PLEC p.Ser3306Arg Uncertain significance ★ ⚠ same residue
PLEC p.Arg1490Ter Pathogenic/Likely pathogenic ★★ same condition
PLEC p.Arg1973Trp Pathogenic ★★ ⚠ same condition
PLEC p.Arg2027Ter Pathogenic ★★ same condition
PLEC p.Arg2292Ter Pathogenic ★★ same condition
PLEC p.Arg2324Ter Pathogenic ★★ same condition
PLEC p.Arg2394Ter Pathogenic ★★ same condition
PLEC p.Arg559Ter Pathogenic ★★ 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/plec-p-ser3306 (accessed [today's date]).

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