Is TLK2 p.His423Arg (c.1268A>G) pathogenic?

TLK2 p.His423Arg (c.1268A>G) is classified Uncertain significance in TLK2 (ClinVar, Single submitter, 1 submitter; last evaluated 2026-06-10). AlphaMissense: likely pathogenic (0.8179); Absent from gnomAD v4.1.

How common is TLK2 p.His423Arg (c.1268A>G) in the general population?

TLK2 p.His423Arg (c.1268A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about TLK2 p.His423Arg (c.1268A>G)?

AlphaMissense predicts likely pathogenic (score 0.8179) — an in-silico prediction, not a clinical call.

TLK2 p.His423Arg

c.1268A>G · VCV4536529

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.8179 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.8179	likely pathogenic
REVEL	0.437	indeterminate
SaProt	LLR -13.17	damaging
⇒ AlphaMissense and SaProt both call this damaging; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 2.1, phastCons 1
Regional constraint	o/e 0.22	constrained · MANE · 34 kb · p 3.2e-51 · regional, not allelic
Overall
CADD	24.9	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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 H445R vs ClinVar H423R) — verify the residue.

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: TLK2
Protein: p.His423Arg
Coding: c.1268A>G
MANE Select: NM_006852
Type: single nucleotide variant
Location: chr17:62578556 (GRCh38)
Gene constraint: LOEUF 0.103 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 73.15 · 2 PDB
Residue 445 UniProt numbering: a UniProt-annotated variant site (in mrd57)

Full TLK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

TLK2 c.1121+1G>A Pathogenic/Likely pathogenic ★★ same type
TLK2 c.1550+1G>A Pathogenic/Likely pathogenic ★★ same type
TLK2 p.Arg11Ter Likely pathogenic ★★ same type
TLK2 p.Arg122Ter Pathogenic/Likely pathogenic ★★ same type
TLK2 p.Arg123Ter Pathogenic ★★ same type
TLK2 p.Arg262Ter Pathogenic ★★ same type
TLK2 p.Arg546Trp Pathogenic/Likely pathogenic ★★ same type
TLK2 p.Arg61Ter 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/tlk2-p-his423arg (accessed [today's date]).

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