Is PLEC p.Ala1977= (c.5931G>A) pathogenic?

PLEC p.Ala1977= (c.5931G>A) is classified Likely benign in PLEC (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-05-27). Ultra-rare (popmax 0.0166%, mid); Associated with autosomal recessive limb-girdle muscular dystrophy type 2Q.

What condition is associated with PLEC p.Ala1977= (c.5931G>A)?

PLEC p.Ala1977= (c.5931G>A) is associated with autosomal recessive limb-girdle muscular dystrophy type 2Q, epidermolysis bullosa simplex 5A, Ogna type, epidermolysis bullosa simplex 5B, with muscular dystrophy (ClinVar).

How common is PLEC p.Ala1977= (c.5931G>A) in the general population?

PLEC p.Ala1977= (c.5931G>A) is ultra-rare (popmax 0.0166%, mid) (gnomAD).

PLEC p.Ala1977=

Q: How is Plectin-related limb-girdle muscular dystrophy R17 inherited?

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

c.5931G>A · rs782739868 · VCV471619

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0166%, mid)

Conditions

autosomal recessive limb-girdle muscular dystrophy type 2Q

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 -12
Overall
CADD	0.074	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0166% Middle Eastern · 1/6,016 alleles

Filtering AF 0.00421% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00382%

Overall 0.00492% 78/1,585,798 alleles · ultra-rare exomes 72/1,433,544 · genomes 6/152,254 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0166%	6,016
European (non-Finnish)	0.00529%	18,900
Remaining individualsnot grpmax-eligible	0.00486%	20,559
East Asian	0.0045%	22,198
Finnishnot grpmax-eligible	0.00415%	24,074
African / African-American	0.00402%	24,862
Admixed American	0.00338%	29,586
South Asian	0.00334%	29,967

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.Ala1977=
Coding: c.5931G>A
MANE Select: NM_201384
dbSNP: rs782739868
Type: single nucleotide variant
Location: chr8:143923998 (GRCh38)
Gene constraint: LOEUF 0.726 · pLI <0.01 (gnomAD)
Residue 1977: the 'required for interaction with intermediate filament proteins' region; the 'central fibrous rod domain' region

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

Disease context

autosomal recessive limb-girdle muscular dystrophy type 2Q — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: epidermolysis bullosa simplex 5A, Ogna type epidermolysis bullosa simplex 5B, with muscular dystrophy epidermolysis bullosa simplex 5C, with pyloric atresia epidermolysis bullosa simplex with nail dystrophy

For Plectin-related limb-girdle muscular dystrophy R17 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

PLEC p.Ala1977Val Conflicting classifications of pathogenicity ★ ⚠ 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-ala1977 (accessed [today's date]).

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