Is CDC73 p.Ile18Thr (c.53T>C) pathogenic?

CDC73 p.Ile18Thr (c.53T>C) is classified Uncertain significance in CDC73 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-07-30). AlphaMissense: likely pathogenic (0.9587); Very rare (popmax 0.00017%, nfe); Associated with parathyroid gland carcinoma.

What condition is associated with CDC73 p.Ile18Thr (c.53T>C)?

CDC73 p.Ile18Thr (c.53T>C) is associated with parathyroid gland carcinoma (ClinVar).

How common is CDC73 p.Ile18Thr (c.53T>C) in the general population?

CDC73 p.Ile18Thr (c.53T>C) is very rare (popmax 0.00017%, nfe) (gnomAD).

How is Parathyroid carcinoma inherited?

Typically Not applicable (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CDC73 p.Ile18Thr (c.53T>C)?

AlphaMissense predicts likely pathogenic (score 0.9587) — an in-silico prediction, not a clinical call.

CDC73 p.Ile18Thr

c.53T>C · rs2103111665 · VCV2820972

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9587 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

parathyroid gland carcinoma

Computational evidence

Protein change
AlphaMissense	0.9587	likely pathogenic
REVEL	0.7	pathogenic-leaning
SaProt	LLR -14.00	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.5	GERP 1.6, phastCons 1
Regional constraint	o/e 0.57	unconstrained · MANE · 16 kb · p 1.1e-08 · regional, not allelic
Overall
CADD	25.5	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.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00017% European (non-Finnish) · 2/1,179,862 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000137% 2/1,461,714 alleles · very rare

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: CDC73
Protein: p.Ile18Thr
Coding: c.53T>C
MANE Select: NM_024529
dbSNP: rs2103111665
Type: single nucleotide variant
Location: chr1:193122253 (GRCh38)
Gene constraint: LOEUF 0.42 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 73.94 · 21 PDB

Full CDC73 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

parathyroid gland carcinoma — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Parathyroid carcinoma (Orphanet):

Inheritance: Not applicable
Onset: Adult
Prevalence: <1 / 1 000 000 (Europe)

Similar variants

CDC73 p.Ile18Val Uncertain significance ★ ⚠ same residue
CDC73 p.Ile18= Likely benign ★ same residue
CDC73 p.Ile18Met Uncertain significance ★ same residue
CDC73 c.1030+2T>C Likely pathogenic ★★ same condition
CDC73 c.131+1G>A Pathogenic/Likely pathogenic ★★ same condition
CDC73 c.237+1G>A Pathogenic ★★ same condition
CDC73 c.423+1G>A Pathogenic ★★ same condition
CDC73 c.513-1G>A Likely pathogenic ★★ 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/cdc73-p-ile18thr (accessed [today's date]).

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