Is CDC73 p.Arg281His (c.842G>A) pathogenic?

CDC73 p.Arg281His (c.842G>A) is classified Uncertain significance in CDC73 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-20). AlphaMissense: likely benign (0.1449); Very rare (popmax 0.005%, amr); Associated with hyperparathyroidism 1.

What condition is associated with CDC73 p.Arg281His (c.842G>A)?

CDC73 p.Arg281His (c.842G>A) is associated with hyperparathyroidism 1, parathyroid gland carcinoma, hereditary neoplastic syndrome (ClinVar).

How common is CDC73 p.Arg281His (c.842G>A) in the general population?

CDC73 p.Arg281His (c.842G>A) is very rare (popmax 0.005%, amr) (gnomAD).

How is Familial isolated hyperparathyroidism inherited?

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

What do computational predictors say about CDC73 p.Arg281His (c.842G>A)?

AlphaMissense predicts likely benign (score 0.1449) — an in-silico prediction, not a clinical call.

CDC73 p.Arg281His

c.842G>A · rs762716583 · VCV950136

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

AlphaMissense

likely benign

0.1449 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.005%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hyperparathyroidism 1

Computational evidence

Protein change
AlphaMissense	0.1449	likely benign
REVEL	0.192	benign-leaning
SaProt	LLR -8.62	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.6, phastCons 1
Regional constraint	o/e 0.57	unconstrained · MANE · 109 kb · p 8.5e-19 · regional, not allelic
Overall
CADD	25.2	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 0.005% Admixed American · 3/59,978 alleles

Filtering AF 0.00133% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000668%

Overall 0.00106% 17/1,609,942 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.005%	19,993
Finnishnot grpmax-eligible	0.00156%	63,992
European (non-Finnish)	0.00111%	90,489

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.Arg281His
Coding: c.842G>A
MANE Select: NM_024529
dbSNP: rs762716583
Type: single nucleotide variant
Location: chr1:193150317 (GRCh38)
Gene constraint: LOEUF 0.42 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 73.94 · 21 PDB
Residue 281: the 'interaction with polr2a and paf1' region; the 'disordered' region

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

Disease context

hyperparathyroidism 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: parathyroid gland carcinoma hereditary neoplastic syndrome

For Familial isolated hyperparathyroidism (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult

Similar variants

CDC73 p.Arg281Leu Uncertain significance ★★ ⚠ same residue
CDC73 p.Arg281Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
CDC73 p.Arg281Ser Uncertain significance ★ ⚠ same residue
CDC73 p.Arg281= Likely benign ★ 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-arg281his (accessed [today's date]).

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