Is KL p.Arg258Trp (c.772C>T) pathogenic?

KL p.Arg258Trp (c.772C>T) is classified Uncertain significance in KL (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-25). AlphaMissense: likely benign (0.1151); Very rare (popmax 0.00801%, afr).

How common is KL p.Arg258Trp (c.772C>T) in the general population?

KL p.Arg258Trp (c.772C>T) is very rare (popmax 0.00801%, afr) (gnomAD).

What do computational predictors say about KL p.Arg258Trp (c.772C>T)?

AlphaMissense predicts likely benign (score 0.1151) — an in-silico prediction, not a clinical call.

KL p.Arg258Trp

c.772C>T · VCV4544185

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1151 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00801%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1151	likely benign
REVEL	0.123	moderately benign-leaning
SaProt	LLR -8.61	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 1.3	GERP 0.52, phastCons 1
Regional constraint	o/e 0.97	unconstrained · MANE · 48 kb · p 0.22 · regional, not allelic
Overall
CADD	24.2	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 0.00801% African / African-American · 6/74,948 alleles

Filtering AF 0.00347% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00228%

Overall 0.000439% 7/1,593,732 alleles · very rare exomes 1/1,441,382 · genomes 6/152,350 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00801%	12,491
South Asian	0.00111%	90,318

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: KL
Protein: p.Arg258Trp
Coding: c.772C>T
MANE Select: NM_004795
Type: single nucleotide variant
Location: chr13:33017212 (GRCh38)
Gene constraint: LOEUF 0.917 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.48 · 6 PDB
Residue 258: the 'glycosyl hydrolase-1 1' region

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

Similar variants

KL c.1331-3C>A Uncertain significance ★★ same type
KL p.Ala3Thr Uncertain significance ★★ ⚠ same type
KL p.Ala50Val Uncertain significance ★★ ⚠ same type
KL p.Ala656Thr Uncertain significance ★★ ⚠ same type
KL p.Ala663Thr Uncertain significance ★★ ⚠ same type
KL p.Ala987Thr Uncertain significance ★★ ⚠ same type
KL p.Arg179Trp Uncertain significance ★★ ⚠ same type
KL p.Arg181Gln Uncertain significance ★★ ⚠ 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/kl-p-arg258trp (accessed [today's date]).

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