Is BICD2 p.Arg622Trp (c.1864C>T) pathogenic?

BICD2 p.Arg622Trp (c.1864C>T) is classified Conflicting classifications of pathogenicity in BICD2 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2022-09-28). AlphaMissense: likely benign (0.3186); Very rare (popmax 0.00333%, amr); Associated with autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures.

How common is BICD2 p.Arg622Trp (c.1864C>T) in the general population?

BICD2 p.Arg622Trp (c.1864C>T) is very rare (popmax 0.00333%, amr) (gnomAD).

What do computational predictors say about BICD2 p.Arg622Trp (c.1864C>T)?

AlphaMissense predicts likely benign (score 0.3186) — an in-silico prediction, not a clinical call.

BICD2 p.Arg622Trp

Q: What condition is associated with BICD2 p.Arg622Trp (c.1864C>T)?

BICD2 p.Arg622Trp (c.1864C>T) 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.1864C>T · rs1445290655 · VCV802490

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.3186 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00333%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

autosomal dominant childhood-onset proximal spinal muscular atrophy with contractures

Computational evidence

Protein change
AlphaMissense	0.3186	likely benign
REVEL	0.25	benign-leaning
SaProt	LLR -9.69	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 7.2	GERP -0.67, phastCons 1
Regional constraint	o/e 0.72	unconstrained · MANE · 3,839 bp · p 5.4e-09 · regional, not allelic
Overall
CADD	29.7	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

Grpmax group 0.00333% Admixed American · 2/60,004 alleles

Filtering AF 0.000875% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000443%

Overall 0.000806% 13/1,613,756 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00333%	30,002
South Asian	0.00329%	30,361
European (non-Finnish)	0.000678%	147,493

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.Arg622Trp
Coding: c.1864C>T
MANE Select: NM_001003800
dbSNP: rs1445290655
Type: single nucleotide variant
Location: chr9:92718781 (GRCh38)
Gene constraint: LOEUF 0.507 · pLI 0.95 (gnomAD)
Structure: AlphaFold pLDDT 78.89 · 2 PDB
Residue 622: the 'disordered' region; the 'interaction with ranbp2' 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.Arg622Gln Uncertain significance ★ ⚠ same residue
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

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-arg622trp (accessed [today's date]).

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