Is CTDSP1 p.Pro61Ala (c.181C>G) pathogenic?

CTDSP1 p.Pro61Ala (c.181C>G) is classified Uncertain significance in CTDSP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-01-24). AlphaMissense: likely benign (0.1199); Very rare (popmax 0.0029%, nfe).

How common is CTDSP1 p.Pro61Ala (c.181C>G) in the general population?

CTDSP1 p.Pro61Ala (c.181C>G) is very rare (popmax 0.0029%, nfe) (gnomAD).

What do computational predictors say about CTDSP1 p.Pro61Ala (c.181C>G)?

AlphaMissense predicts likely benign (score 0.1199) — an in-silico prediction, not a clinical call.

CTDSP1 p.Pro61Ala

c.181C>G · rs748388380 · VCV2459500

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1199 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0029%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1199	likely benign
REVEL	0.127	moderately benign-leaning
SaProt	LLR -7.89	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 3.9	GERP -0.21, phastCons 1
Regional constraint	o/e 1.31	unconstrained · MANE · 2,070 bp · p 0.0011 · regional, not allelic
Overall
CADD	22.9	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 0.0029% European (non-Finnish) · 34/1,174,344 alleles

Filtering AF 0.00208% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00184%

Overall 0.00225% 36/1,602,366 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0029%	34,540
African / African-American	0.00269%	37,214

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: CTDSP1
Protein: p.Pro61Ala
Coding: c.181C>G
MANE Select: NM_021198
dbSNP: rs748388380
Type: single nucleotide variant
Location: chr2:218401677 (GRCh38)
Gene constraint: LOEUF 0.686 · pLI 0.09 (gnomAD)
Structure: AlphaFold pLDDT 82.13 · 11 PDB

Full CTDSP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CTDSP1 p.Ala56Thr Benign ★★ ⚠ same type
CTDSP1 p.Ala15Thr Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala15Val Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala163Val Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala171Val Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala174Ser Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala56Val Uncertain significance ★ ⚠ same type
CTDSP1 p.Ala5Val Uncertain significance ★ ⚠ same type

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/ctdsp1-p-pro61ala (accessed [today's date]).

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