Is CHSY1 p.Pro674= (c.2022C>A) pathogenic?

CHSY1 p.Pro674= (c.2022C>A) is classified Likely benign in CHSY1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-17). Very rare (popmax 0.000339%, nfe); Associated with temtamy preaxial brachydactyly syndrome.

What condition is associated with CHSY1 p.Pro674= (c.2022C>A)?

CHSY1 p.Pro674= (c.2022C>A) is associated with temtamy preaxial brachydactyly syndrome (ClinVar).

How common is CHSY1 p.Pro674= (c.2022C>A) in the general population?

CHSY1 p.Pro674= (c.2022C>A) is very rare (popmax 0.000339%, nfe) (gnomAD).

CHSY1 p.Pro674=

c.2022C>A · rs747770781 · VCV2981826

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.000339%, nfe)

Conditions

temtamy preaxial brachydactyly syndrome

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 4.5	GERP 0.95, phastCons 1
Overall
CADD	6.887	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000339% European (non-Finnish) · 4/1,180,036 alleles

Filtering AF 7.9e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 5.4e-05%

Overall 0.000274% 4/1,461,890 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: CHSY1
Protein: p.Pro674=
Coding: c.2022C>A
MANE Select: NM_014918
dbSNP: rs747770781
Type: single nucleotide variant
Location: chr15:101177775 (GRCh38)
Gene constraint: LOEUF 0.357 · pLI 1.00 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 84.20

Full CHSY1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

temtamy preaxial brachydactyly syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CHSY1 p.Ala263Ser Uncertain significance ★★ ⚠ same condition
CHSY1 p.Ala61Val Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg180His Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg229Trp Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg233Trp Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg244Trp Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg322His Uncertain significance ★★ ⚠ same condition
CHSY1 p.Arg336Cys 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/chsy1-p-pro674 (accessed [today's date]).

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