Is BICD2 p.Ala771= (c.2313T>A) pathogenic?

BICD2 p.Ala771= (c.2313T>A) is classified Benign in BICD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-19). Ultra-rare (popmax 0.0107%, afr); Associated with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures.

How common is BICD2 p.Ala771= (c.2313T>A) in the general population?

BICD2 p.Ala771= (c.2313T>A) is ultra-rare (popmax 0.0107%, afr) (gnomAD).

BICD2 p.Ala771=

Q: What condition is associated with BICD2 p.Ala771= (c.2313T>A)?

BICD2 p.Ala771= (c.2313T>A) is associated with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures (ClinVar).

Q: How is Autosomal dominant childhood-onset proximal spinal muscular atrophy inherited?

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

c.2313T>A · rs561748013 · VCV2055269

Benign Single submitter

Classification

Benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0107%, afr)

Conditions

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures

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 -20	GERP -5.1
Overall
CADD	0.018	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0107% African / African-American · 8/74,902 alleles

Filtering AF 0.00528% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00381%

Overall 0.000561% 9/1,605,094 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0107%	9,363
Admixed American	0.00167%	59,810

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: BICD2
Protein: p.Ala771=
Coding: c.2313T>A
MANE Select: NM_001003800
dbSNP: rs561748013
Type: single nucleotide variant
Location: chr9:92715409 (GRCh38)
Gene constraint: LOEUF 0.507 · pLI 0.95 (gnomAD)
Structure: AlphaFold pLDDT 78.89 · 2 PDB
Residue 771: an α-helix; the 'interaction with ranbp2' region; the 'interacts with rab6a' region

Full BICD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal dominant childhood-onset proximal spinal muscular atrophy (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Antenatal, Childhood, Infancy, Neonatal
Prevalence: <1 / 1 000 000 (Worldwide)

Similar variants

BICD2 p.Arg694Cys Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Lys734Glu Likely pathogenic ★★ same condition
BICD2 p.Ser107Leu Pathogenic ★★ ⚠ same condition
BICD2 p.Thr703Met Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Tyr556Ser Likely pathogenic ★★ ⚠ same condition
BICD2 c.1062+5G>A Uncertain significance ★★ same condition
BICD2 p.Ala326Pro Uncertain significance ★★ ⚠ same condition
BICD2 p.Ala595Val Uncertain significance ★★ ⚠ 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/bicd2-p-ala771 (accessed [today's date]).

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