Is AP5Z1 p.Ser776Arg (c.2328C>A) pathogenic?

AP5Z1 p.Ser776Arg (c.2328C>A) is classified Benign/Likely benign in AP5Z1 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-02-03). AlphaMissense: likely benign (0.2052); Low-frequency (popmax 1.42%, afr); Associated with hereditary spastic paraplegia 48.

What condition is associated with AP5Z1 p.Ser776Arg (c.2328C>A)?

AP5Z1 p.Ser776Arg (c.2328C>A) is associated with hereditary spastic paraplegia 48 (ClinVar).

How common is AP5Z1 p.Ser776Arg (c.2328C>A) in the general population?

AP5Z1 p.Ser776Arg (c.2328C>A) is low-frequency (popmax 1.42%, afr) (gnomAD).

How is Autosomal recessive spastic paraplegia type 48 inherited?

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

What do computational predictors say about AP5Z1 p.Ser776Arg (c.2328C>A)?

AlphaMissense predicts likely benign (score 0.2052) — an in-silico prediction, not a clinical call.

AP5Z1 p.Ser776Arg

c.2328C>A · rs192794637 · VCV585437

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.2052 · ACMG-weighted

gnomAD v4.1

Rare

low-frequency (popmax 1.42%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary spastic paraplegia 48

Computational evidence

Protein change
AlphaMissense	0.2052	likely benign
REVEL	0.02	moderately benign-leaning
SaProt	LLR -6.38	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 0.041	GERP -2.9, phastCons 0.001
Regional constraint	o/e 1.43	unconstrained · MANE · 16 kb · p 5.7e-46 · regional, not allelic
Overall
CADD	5.057	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 1.42% African / African-American · 1,067/75,074 alleles

Filtering AF 1.35% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.32%

Overall 0.0787% 1,269/1,612,544 alleles · low-frequency

Ancestry group	Frequency	1 in
African / African-Americangrpmax	1.42%	70
Middle Eastern	0.116%	866
Admixed American	0.1%	1,000
Remaining individualsnot grpmax-eligible	0.0897%	1,115
European (non-Finnish)	0.00627%	15,943
South Asian	0.00549%	18,207

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: AP5Z1
Protein: p.Ser776Arg
Coding: c.2328C>A
MANE Select: NM_014855
dbSNP: rs192794637
Type: single nucleotide variant
Location: chr7:4791289 (GRCh38)
Gene constraint: LOEUF 1.641 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 85.32

Full AP5Z1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary spastic paraplegia 48 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal recessive spastic paraplegia type 48 (Orphanet):

Inheritance: Autosomal recessive
Onset: Adult

Similar variants

AP5Z1 c.1312-2A>G Pathogenic/Likely pathogenic ★★ same condition
AP5Z1 c.1707+1G>A Likely pathogenic ★★ same condition
AP5Z1 c.1806-1G>C Likely pathogenic ★★ same condition
AP5Z1 p.Arg138Ter Pathogenic/Likely pathogenic ★★ same condition
AP5Z1 p.Arg310Ter Pathogenic/Likely pathogenic ★★ same condition
AP5Z1 p.Arg311Ter Pathogenic/Likely pathogenic ★★ same condition
AP5Z1 p.Arg345Ter Pathogenic/Likely pathogenic ★★ same condition
AP5Z1 p.Gln17Ter Pathogenic/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/ap5z1-p-ser776arg (accessed [today's date]).

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