Is BICD2 p.Lys686Glu (c.2056A>G) pathogenic?

BICD2 p.Lys686Glu (c.2056A>G) is classified Likely pathogenic in BICD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-01-23). AlphaMissense: likely pathogenic (0.996); Absent from gnomAD v4.1; Associated with spinal muscular atrophy, lower extremity-predominant, 2b, prenatal onset, autosomal dominant.

How common is BICD2 p.Lys686Glu (c.2056A>G) in the general population?

BICD2 p.Lys686Glu (c.2056A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about BICD2 p.Lys686Glu (c.2056A>G)?

AlphaMissense predicts likely pathogenic (score 0.996) — an in-silico prediction, not a clinical call.

BICD2 p.Lys686Glu

Q: What condition is associated with BICD2 p.Lys686Glu (c.2056A>G)?

BICD2 p.Lys686Glu (c.2056A>G) is associated with spinal muscular atrophy, lower extremity-predominant, 2b, prenatal onset, autosomal dominant (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.2056A>G · VCV4813696

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.996 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

spinal muscular atrophy, lower extremity-predominant, 2b, prenatal onset, autosomal dominant

Computational evidence

Protein change
AlphaMissense	0.996	likely pathogenic ✓ concordant with ClinVar · top 4% in BICD2
REVEL	0.549	indeterminate
SaProt	LLR -13.92	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 2.5, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 3,839 bp · p 5.4e-09 · regional, not allelic
Overall
CADD	28.7	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: BICD2
Protein: p.Lys686Glu
Coding: c.2056A>G
MANE Select: NM_001003800
Type: single nucleotide variant
Location: chr9:92718589 (GRCh38)
Gene constraint: LOEUF 0.507 · pLI 0.95 (gnomAD)
Structure: AlphaFold pLDDT 78.89 · 2 PDB
Residue 686: 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

spinal muscular atrophy, lower extremity-predominant, 2b, prenatal onset, autosomal dominant — 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.Lys686Asn Likely pathogenic ★ same residue
BICD2 p.Lys686Met Conflicting classifications of pathogenicity ★ ⚠ same residue
BICD2 p.Lys686= Benign ★ same residue
BICD2 p.Arg694Cys Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Arg694Gly Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Arg694His Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Glu774Lys Pathogenic/Likely pathogenic ★★ same condition
BICD2 p.Asn301Ser 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-lys686glu (accessed [today's date]).

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