Is SGCA p.Ala145= (c.435G>A) pathogenic?

SGCA p.Ala145= (c.435G>A) is classified Likely benign in SGCA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-01-14). Very rare (popmax 0.00454%, eas); Associated with autosomal recessive limb-girdle muscular dystrophy type 2D.

What condition is associated with SGCA p.Ala145= (c.435G>A)?

SGCA p.Ala145= (c.435G>A) is associated with autosomal recessive limb-girdle muscular dystrophy type 2D (ClinVar).

How common is SGCA p.Ala145= (c.435G>A) in the general population?

SGCA p.Ala145= (c.435G>A) is very rare (popmax 0.00454%, eas) (gnomAD).

SGCA p.Ala145=

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.435G>A · rs763694408 · VCV1096003

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00454%, eas)

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.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 2.5	GERP 1.4, phastCons 1
Overall
CADD	15.39	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00454% East Asian · 2/44,016 alleles

Filtering AF 0.000753% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000432%

Overall 0.00107% 17/1,591,478 alleles · very rare exomes 16/1,439,356 · genomes 1/152,122 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00454%	22,008
South Asian	0.00229%	43,716
Admixed American	0.00177%	56,568
European (non-Finnish)	0.00103%	97,427

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.Ala145=
Coding: c.435G>A
MANE Select: NM_000023
dbSNP: rs763694408
Type: single nucleotide variant
Location: chr17:50168423 (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.Ala145Glu 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
SGCA p.Arg192Ter Pathogenic ★★★ same condition
SGCA p.Arg221Cys Likely pathogenic ★★★ same condition
SGCA p.Arg221Pro 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-ala145 (accessed [today's date]).

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