Is SGCA p.Arg181= (c.543T>A) pathogenic?

SGCA p.Arg181= (c.543T>A) is classified Likely benign in SGCA (ClinVar, Single submitter, 1 submitter; last evaluated 2022-11-01). Very rare (popmax 0.00582%, sas); Associated with autosomal recessive limb-girdle muscular dystrophy type 2D.

What condition is associated with SGCA p.Arg181= (c.543T>A)?

SGCA p.Arg181= (c.543T>A) is associated with autosomal recessive limb-girdle muscular dystrophy type 2D (ClinVar).

How common is SGCA p.Arg181= (c.543T>A) in the general population?

SGCA p.Arg181= (c.543T>A) is very rare (popmax 0.00582%, sas) (gnomAD).

SGCA p.Arg181=

Q: How is Alpha-sarcoglycan-related limb-girdle muscular dystrophy R3 inherited?

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

c.543T>A · rs776214016 · VCV1156618

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00582%, sas)

Conditions

autosomal recessive limb-girdle muscular dystrophy type 2D

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.056	moderately benign-leaning
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -2.1	GERP -0.68
Overall
CADD	7.658	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00582% South Asian · 5/85,976 alleles

Filtering AF 0.0022% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00143%

Overall 0.000508% 8/1,576,090 alleles · very rare exomes 7/1,424,008 · genomes 1/152,082 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00582%	17,195
Admixed American	0.0037%	27,054
European (non-Finnish)	8.62e-05%	1,160,205

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: SGCA
Protein: p.Arg181=
Coding: c.543T>A
MANE Select: NM_000023
dbSNP: rs776214016
Type: single nucleotide variant
Location: chr17:50168531 (GRCh38)
Gene constraint: LOEUF 1.273 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 80.15

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

Disease context

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

For Alpha-sarcoglycan-related limb-girdle muscular dystrophy R3 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Childhood
Prevalence: <1 / 1 000 000 (United Kingdom)

Similar variants

SGCA p.Arg181Cys Uncertain significance ★★ ⚠ same residue
SGCA p.Arg181His Uncertain significance ★★ ⚠ same residue
SGCA p.Arg181Leu Uncertain significance ★★ ⚠ same residue
SGCA p.Arg181Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
SGCA c.37+6T>C Pathogenic ★★★ same condition
SGCA c.585-1G>A Pathogenic ★★★ same condition
SGCA c.957-11C>G Likely pathogenic ★★★ same condition
SGCA p.Ala107Val 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/sgca-p-arg181 (accessed [today's date]).

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