Is TONSL p.Arg263Pro (c.788G>C) pathogenic?

TONSL p.Arg263Pro (c.788G>C) is classified Uncertain significance in TONSL (ClinVar, Single submitter, 1 submitter; last evaluated 2024-04-03). AlphaMissense: likely pathogenic (0.9302); Absent from gnomAD v4.1.

How common is TONSL p.Arg263Pro (c.788G>C) in the general population?

TONSL p.Arg263Pro (c.788G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about TONSL p.Arg263Pro (c.788G>C)?

AlphaMissense predicts likely pathogenic (score 0.9302) — an in-silico prediction, not a clinical call.

TONSL p.Arg263Pro

c.788G>C · rs752858789 · VCV1720615

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9302 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9302	likely pathogenic · top 5% in TONSL
REVEL	0.667	pathogenic-leaning
SaProt	LLR -9.19	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 1.5, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 15 kb · p 0.67 · regional, not allelic
Overall
CADD	28.0	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: TONSL
Protein: p.Arg263Pro
Coding: c.788G>C
MANE Select: NM_013432
dbSNP: rs752858789
Type: single nucleotide variant
Location: chr8:144442114 (GRCh38)
Gene constraint: LOEUF 1.024 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.06 · 3 PDB
Residue 263: a UniProt-annotated variant site (in semdsp; disease phenotype includes immunologic and hematologic abnormalities); a UniProt-annotated variant site (in semdsp)

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

Similar variants

TONSL p.Arg263Gln Uncertain significance ★★ ⚠ same residue
TONSL p.Arg263Ter Pathogenic ★ same residue
TONSL p.Arg263= Likely benign ★ same residue
TONSL c.1891-1G>C Pathogenic/Likely pathogenic ★★ same type
TONSL p.Arg875Ter Pathogenic/Likely pathogenic ★★ same type
TONSL p.Arg934Trp Pathogenic ★★ ⚠ same type
TONSL p.Gln177Ter Pathogenic/Likely pathogenic ★★ same type
TONSL p.Gln511Ter Pathogenic/Likely pathogenic ★★ same type

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/tonsl-p-arg263pro (accessed [today's date]).

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