Is TONSL p.Leu201Val (c.601C>G) pathogenic?

TONSL p.Leu201Val (c.601C>G) is classified Uncertain significance in TONSL (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-12-26). AlphaMissense: likely benign (0.1585); Ultra-rare (popmax 0.0203%, afr); Associated with Inborn genetic diseases.

What condition is associated with TONSL p.Leu201Val (c.601C>G)?

TONSL p.Leu201Val (c.601C>G) is associated with Inborn genetic diseases (ClinVar).

How common is TONSL p.Leu201Val (c.601C>G) in the general population?

TONSL p.Leu201Val (c.601C>G) is ultra-rare (popmax 0.0203%, afr) (gnomAD).

What do computational predictors say about TONSL p.Leu201Val (c.601C>G)?

AlphaMissense predicts likely benign (score 0.1585) — an in-silico prediction, not a clinical call.

TONSL p.Leu201Val

c.601C>G · rs145842860 · VCV1956471

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1585 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0203%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.1585	likely benign
REVEL	0.406	indeterminate
SaProt	LLR -6.88	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.7	GERP 0.4, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 15 kb · p 0.67 · regional, not allelic
Overall
CADD	23.4	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.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0203% African / African-American · 15/73,840 alleles

Filtering AF 0.0125% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.01%

Overall 0.00134% 21/1,562,276 alleles · ultra-rare exomes 11/1,409,934 · genomes 10/152,342 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0203%	4,923
Admixed American	0.0109%	9,198

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: TONSL
Protein: p.Leu201Val
Coding: c.601C>G
MANE Select: NM_013432
dbSNP: rs145842860
Type: single nucleotide variant
Location: chr8:144442390 (GRCh38)
Gene constraint: LOEUF 1.024 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 76.06 · 3 PDB
Residue 201: 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

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

TONSL p.Ala1053Ser Uncertain significance ★★ ⚠ same condition
TONSL p.Ala1065Ser Uncertain significance ★★ ⚠ same condition
TONSL p.Ala1093Ser Uncertain significance ★★ ⚠ same condition
TONSL p.Ala1200Thr Uncertain significance ★★ ⚠ same condition
TONSL p.Ala215Thr Uncertain significance ★★ ⚠ same condition
TONSL p.Ala232Val Uncertain significance ★★ ⚠ same condition
TONSL p.Ala331Thr Uncertain significance ★★ ⚠ same condition
TONSL p.Ala478Glu 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/tonsl-p-leu201val (accessed [today's date]).

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