Is AMPD2 p.Val305Ile (c.913G>A) pathogenic?

AMPD2 p.Val305Ile (c.913G>A) is classified Uncertain significance in AMPD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-05-04). AlphaMissense: likely benign (0.0938); Rare (popmax 0.173%, sas); Associated with hereditary spastic paraplegia 63.

What condition is associated with AMPD2 p.Val305Ile (c.913G>A)?

AMPD2 p.Val305Ile (c.913G>A) is associated with hereditary spastic paraplegia 63, pontocerebellar hypoplasia type 9 (ClinVar).

How common is AMPD2 p.Val305Ile (c.913G>A) in the general population?

AMPD2 p.Val305Ile (c.913G>A) is rare (popmax 0.173%, sas) (gnomAD).

How is Autosomal recessive spastic paraplegia type 63 inherited?

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

What do computational predictors say about AMPD2 p.Val305Ile (c.913G>A)?

AlphaMissense predicts likely benign (score 0.0938) — an in-silico prediction, not a clinical call.

AMPD2 p.Val305Ile

c.913G>A · rs553822688 · VCV1939719

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0938 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.173%, sas)

Missense predictors

0/2 damaging

AlphaMissense, REVEL

Conditions

hereditary spastic paraplegia 63

Computational evidence

Protein change
AlphaMissense	0.0938	likely benign
REVEL	0.232	benign-leaning
⇒ AlphaMissense and REVEL both call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.5	GERP -0.74, phastCons 1
Regional constraint	o/e 0.89	unconstrained · MANE · 1,721 bp · p 0.065 · regional, not allelic
Overall
CADD	24.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM V359I vs ClinVar V305I) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.173% South Asian · 158/91,090 alleles

Filtering AF 0.151% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.143%

Overall 0.0106% 171/1,614,030 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.173%	577
Remaining individualsnot grpmax-eligible	0.0064%	15,625
African / African-American	0.00534%	18,741
East Asian	0.00223%	44,886
European (non-Finnish)	0.000339%	294,992

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: AMPD2
Protein: p.Val305Ile
Coding: c.913G>A
MANE Select: NM_001368809
dbSNP: rs553822688
Type: single nucleotide variant
Location: chr1:109627481 (GRCh38)
Gene constraint: LOEUF 0.705 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 81.28 · 5 PDB
Residue 305: an α-helix

Full AMPD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary spastic paraplegia 63 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: pontocerebellar hypoplasia type 9

For Autosomal recessive spastic paraplegia type 63 (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy

Similar variants

AMPD2 c.1698+1G>A Pathogenic/Likely pathogenic ★★ same condition
AMPD2 p.Arg353Ter Pathogenic/Likely pathogenic ★★ same condition
AMPD2 p.Arg449Ter Pathogenic/Likely pathogenic ★★ same condition
AMPD2 p.Arg620His Pathogenic/Likely pathogenic ★★ same condition
AMPD2 p.Arg789His Likely pathogenic ★★ same condition
AMPD2 p.Glu174Ter Pathogenic/Likely pathogenic ★★ same condition
AMPD2 c.1080+3G>A Uncertain significance ★★ same condition
AMPD2 c.353+3G>A 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/ampd2-p-val305ile (accessed [today's date]).

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