Is KL p.Pro338= (c.1014C>A) pathogenic?

KL p.Pro338= (c.1014C>A) is classified Uncertain significance in KL (ClinVar, Single submitter, 1 submitter; last evaluated 2018-01-12). Very rare (popmax 0.00347%, nfe); Associated with tumoral calcinosis, hyperphosphatemic, familial, 3.

What condition is associated with KL p.Pro338= (c.1014C>A)?

KL p.Pro338= (c.1014C>A) is associated with tumoral calcinosis, hyperphosphatemic, familial, 3 (ClinVar).

How common is KL p.Pro338= (c.1014C>A) in the general population?

KL p.Pro338= (c.1014C>A) is very rare (popmax 0.00347%, nfe) (gnomAD).

How is Familial tumoral calcinosis inherited?

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

KL p.Pro338=

c.1014C>A · rs547049483 · VCV881423

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00347%, nfe)

Conditions

tumoral calcinosis, hyperphosphatemic, familial, 3

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -9.8	GERP -3.8
Overall
CADD	0.273	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00347% European (non-Finnish) · 41/1,179,898 alleles

Filtering AF 0.00259% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00233%

Overall 0.00254% 41/1,613,816 alleles · very rare exomes 39/1,461,760 · genomes 2/152,056 · joint denominator

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.Pro338=
Coding: c.1014C>A
MANE Select: NM_004795
dbSNP: rs547049483
Type: single nucleotide variant
Location: chr13:33053961 (GRCh38)
Gene constraint: LOEUF 0.917 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.48 · 6 PDB
Residue 338: the 'glycosyl hydrolase-1 1' region

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

Disease context

tumoral calcinosis, hyperphosphatemic, familial, 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial tumoral calcinosis (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

KL c.1331-3C>A Uncertain significance ★★ same condition
KL p.Ala987Thr Uncertain significance ★★ ⚠ same condition
KL p.Arg179Trp Uncertain significance ★★ ⚠ same condition
KL p.Arg594Cys Uncertain significance ★★ ⚠ same condition
KL p.Arg620Cys Uncertain significance ★★ ⚠ same condition
KL p.Arg628Cys Uncertain significance ★★ ⚠ same condition
KL p.Arg751Gly Uncertain significance ★★ ⚠ same condition
KL p.Arg853Cys 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/kl-p-pro338 (accessed [today's date]).

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