Is CDC73 p.Arg9= (c.27A>G) pathogenic?

CDC73 p.Arg9= (c.27A>G) is classified Likely benign in CDC73 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-20). Ultra-rare (popmax 0.0383%, amr); Associated with parathyroid gland carcinoma.

What condition is associated with CDC73 p.Arg9= (c.27A>G)?

CDC73 p.Arg9= (c.27A>G) is associated with parathyroid gland carcinoma, hereditary neoplastic syndrome (ClinVar).

How common is CDC73 p.Arg9= (c.27A>G) in the general population?

CDC73 p.Arg9= (c.27A>G) is ultra-rare (popmax 0.0383%, amr) (gnomAD).

How is Parathyroid carcinoma inherited?

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

CDC73 p.Arg9=

c.27A>G · rs763452834 · VCV412620

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0383%, amr)

Conditions

parathyroid gland carcinoma

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.8	GERP -0.72, phastCons 1
Overall
CADD	13.67	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0383% Admixed American · 23/60,012 alleles

Filtering AF 0.0261% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0222%

Overall 0.00186% 30/1,614,078 alleles · ultra-rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.0383%	2,609
Remaining individualsnot grpmax-eligible	0.0048%	20,829
African / African-American	0.00133%	74,950
European (non-Finnish)	0.000254%	393,342

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.Arg9=
Coding: c.27A>G
MANE Select: NM_024529
dbSNP: rs763452834
Type: single nucleotide variant
Location: chr1:193122227 (GRCh38)
Gene constraint: LOEUF 0.42 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 73.94 · 21 PDB
Residue 9: a UniProt-annotated variant site (in hrpt2; uncertain significance; found as somatic mutation in a parathyroid carcinoma sample from a patient who also carries a germline mutation causing a splicing defect); an α-helix

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

Also linked: hereditary neoplastic syndrome

For Parathyroid carcinoma (Orphanet):

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

Similar variants

CDC73 p.Arg9Ter Pathogenic ★★ same residue
CDC73 p.Arg9Pro Uncertain significance ★★ ⚠ same residue
CDC73 p.Arg9Gln Uncertain significance ★ ⚠ same residue
CDC73 p.Arg9Leu 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

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-arg9 (accessed [today's date]).

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