Is SGCD p.Ala278Ser (c.832G>T) pathogenic?

SGCD p.Ala278Ser (c.832G>T) is classified Uncertain significance in SGCD (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-05-26). AlphaMissense: likely benign (0.0599); Very rare (popmax 0.000848%, nfe); Associated with autosomal recessive limb-girdle muscular dystrophy type 2F.

How common is SGCD p.Ala278Ser (c.832G>T) in the general population?

SGCD p.Ala278Ser (c.832G>T) is very rare (popmax 0.000848%, nfe) (gnomAD).

What do computational predictors say about SGCD p.Ala278Ser (c.832G>T)?

AlphaMissense predicts likely benign (score 0.0599) — an in-silico prediction, not a clinical call.

SGCD p.Ala278Ser

Q: What condition is associated with SGCD p.Ala278Ser (c.832G>T)?

SGCD p.Ala278Ser (c.832G>T) is associated with autosomal recessive limb-girdle muscular dystrophy type 2F, dilated cardiomyopathy 1L (ClinVar).

Q: How is Delta-sarcoglycan-related limb-girdle muscular dystrophy R6 inherited?

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

c.832G>T · rs753240054 · VCV648245

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0599 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000848%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

autosomal recessive limb-girdle muscular dystrophy type 2F

Computational evidence

Protein change
AlphaMissense	0.0599	likely benign
REVEL	0.188	benign-leaning
SaProt	LLR -5.12	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 3.7	GERP -4, phastCons 0.99
Regional constraint	o/e 1.12	unconstrained · MANE · 430 kb · p 0.031 · regional, not allelic
Overall
CADD	6.428	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A277S vs ClinVar A278S) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000848% European (non-Finnish) · 10/1,178,614 alleles

Filtering AF 0.000429% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000313%

Overall 0.00062% 10/1,612,198 alleles · very rare exomes 9/1,460,024 · genomes 1/152,174 · joint denominator

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: SGCD
Protein: p.Ala278Ser
Coding: c.832G>T
MANE Select: NM_000337
dbSNP: rs753240054
Type: single nucleotide variant
Location: chr5:156759349 (GRCh38)
Gene constraint: LOEUF 0.88 · pLI 0.05 (gnomAD)
Structure: AlphaFold pLDDT 81.43

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

Disease context

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

Also linked: dilated cardiomyopathy 1L

For Delta-sarcoglycan-related limb-girdle muscular dystrophy R6 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

SGCD p.Ala278Gly Uncertain significance ★ ⚠ same residue
SGCD p.Ala278Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
SGCD p.Arg165Ter Pathogenic ★★★ same condition
SGCD p.Arg97Ter Pathogenic ★★★ same condition
SGCD p.Arg31Trp Uncertain significance ★★★ ⚠ same condition
SGCD p.Ile64Thr Uncertain significance ★★★ ⚠ same condition
SGCD c.192+1G>A Likely pathogenic ★★ same condition
SGCD c.294+1G>A Likely 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/sgcd-p-ala278ser (accessed [today's date]).

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