Is AGPS p.Arg317= (c.951C>T) pathogenic?

AGPS p.Arg317= (c.951C>T) is classified Likely benign in AGPS (ClinVar, Single submitter, 2 submitters; last evaluated 2025-12-19). Ultra-rare (popmax 0.0615%, afr); Associated with rhizomelic chondrodysplasia punctata type 3.

What condition is associated with AGPS p.Arg317= (c.951C>T)?

AGPS p.Arg317= (c.951C>T) is associated with rhizomelic chondrodysplasia punctata type 3 (ClinVar).

How common is AGPS p.Arg317= (c.951C>T) in the general population?

AGPS p.Arg317= (c.951C>T) is ultra-rare (popmax 0.0615%, afr) (gnomAD).

How is Rhizomelic chondrodysplasia punctata inherited?

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

AGPS p.Arg317=

c.951C>T · rs146526791 · VCV740481

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0615%, afr)

Conditions

rhizomelic chondrodysplasia punctata type 3

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 -1.4, phastCons 1
Overall
CADD	12.18	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0615% African / African-American · 46/74,738 alleles

Filtering AF 0.0473% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0424%

Overall 0.0054% 87/1,612,002 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0615%	1,625
Admixed American	0.0217%	4,610
South Asian	0.0132%	7,587
East Asian	0.00893%	11,194
Remaining individualsnot grpmax-eligible	0.00481%	20,797
European (non-Finnish)	0.000763%	130,991

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: AGPS
Protein: p.Arg317=
Coding: c.951C>T
MANE Select: NM_003659
dbSNP: rs146526791
Type: single nucleotide variant
Location: chr2:177461973 (GRCh38)
Gene constraint: LOEUF 0.408 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 89.27
Residue 317: a binding site; the fad-binding pcmh-type domain

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

Disease context

rhizomelic chondrodysplasia punctata type 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Rhizomelic chondrodysplasia punctata (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

AGPS p.Arg317Cys Uncertain significance ★ ⚠ same residue
AGPS p.Arg182Ter Pathogenic/Likely pathogenic ★★ same condition
AGPS p.Thr309Ile Likely pathogenic ★★ same condition
AGPS c.1855+6C>A Uncertain significance ★★ same condition
AGPS c.*118A>G Uncertain significance ★★ same condition
AGPS p.Asp28Val Uncertain significance ★★ ⚠ same condition
AGPS p.Pro415Leu Uncertain significance ★★ ⚠ same condition
AGPS p.Thr72Ala 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/agps-p-arg317 (accessed [today's date]).

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