Is CMPK2 p.Arg5Cys (c.13C>T) pathogenic?

CMPK2 p.Arg5Cys (c.13C>T) is classified Uncertain significance in CMPK2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-11-13). AlphaMissense: ambiguous (0.5134); Very rare (popmax 0.00194%, nfe).

How common is CMPK2 p.Arg5Cys (c.13C>T) in the general population?

CMPK2 p.Arg5Cys (c.13C>T) is very rare (popmax 0.00194%, nfe) (gnomAD).

What do computational predictors say about CMPK2 p.Arg5Cys (c.13C>T)?

AlphaMissense predicts ambiguous (score 0.5134) — an in-silico prediction, not a clinical call.

CMPK2 p.Arg5Cys

c.13C>T · rs1218236376 · VCV2407401

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5134 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00194%, nfe)

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.5134	ambiguous
REVEL	0.072	moderately benign-leaning
SaProt	LLR -7.47	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.63	GERP -2.4
Regional constraint	o/e 1.09	unconstrained · MANE · 16 kb · p 0.024 · regional, not allelic
Overall
CADD	15.8	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00194% European (non-Finnish) · 20/1,028,650 alleles

Filtering AF 0.00127% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00103%

Overall 0.00154% 20/1,296,254 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: CMPK2
Protein: p.Arg5Cys
Coding: c.13C>T
MANE Select: NM_207315
dbSNP: rs1218236376
Type: single nucleotide variant
Location: chr2:6865684 (GRCh38)
Gene constraint: LOEUF 1.708 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 87.26

Full CMPK2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CMPK2 p.Ala156Thr Uncertain significance ★ ⚠ same type
CMPK2 p.Ala24Gly Uncertain significance ★ ⚠ same type
CMPK2 p.Ala2Val Uncertain significance ★ ⚠ same type
CMPK2 p.Ala49Ser Uncertain significance ★ ⚠ same type
CMPK2 p.Ala49Thr Uncertain significance ★ ⚠ same type
CMPK2 p.Ala4Ser Uncertain significance ★ ⚠ same type
CMPK2 p.Ala4Val Uncertain significance ★ ⚠ same type
CMPK2 p.Ala51Thr 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/cmpk2-p-arg5cys (accessed [today's date]).

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