Is CPT2 p.Arg296Ter (c.886C>T) pathogenic?

CPT2 p.Arg296Ter (c.886C>T) is classified Pathogenic/Likely pathogenic in CPT2 (ClinVar, Multiple submitters, 11 submitters; last evaluated 2026-01-16). Very rare (popmax 0.00401%, afr); Associated with carnitine palmitoyltransferase II deficiency.

How common is CPT2 p.Arg296Ter (c.886C>T) in the general population?

CPT2 p.Arg296Ter (c.886C>T) is very rare (popmax 0.00401%, afr) (gnomAD).

How is Carnitine palmitoyltransferase II deficiency inherited?

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

CPT2 p.Arg296Ter

Q: What condition is associated with CPT2 p.Arg296Ter (c.886C>T)?

CPT2 p.Arg296Ter (c.886C>T) is associated with carnitine palmitoyltransferase II deficiency, carnitine palmitoyl transferase II deficiency, myopathic form, carnitine palmitoyl transferase II deficiency, severe infantile form (ClinVar).

c.886C>T · rs727503887 · VCV166953

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 11 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00401%, afr)

Conditions

carnitine palmitoyltransferase II deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 4 of 5
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.8	GERP 1.1, phastCons 1
Overall
CADD	37.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00401% African / African-American · 3/74,888 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000495%

Overall 0.00112% 18/1,614,008 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00401%	24,963
Admixed American	0.00167%	60,000
Finnishnot grpmax-eligible	0.00156%	64,010
South Asian	0.0011%	91,076
European (non-Finnish)	0.00102%	98,338

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: CPT2
Protein: p.Arg296Ter
Coding: c.886C>T
MANE Select: NM_000098
dbSNP: rs727503887
Type: single nucleotide variant
Location: chr1:53210560 (GRCh38)
Gene constraint: LOEUF 1.038 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.52
Residue 296: a UniProt-annotated variant site (in cpt2d)

Full CPT2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

carnitine palmitoyltransferase II deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: carnitine palmitoyl transferase II deficiency, myopathic form carnitine palmitoyl transferase II deficiency, severe infantile form carnitine palmitoyl transferase II deficiency, neonatal form encephalopathy, acute, infection-induced, susceptibility to, 4

For Carnitine palmitoyltransferase II deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages

Similar variants

CPT2 p.Arg296Gly Likely pathogenic ★ same residue
CPT2 p.Arg296Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
CPT2 p.Arg296Pro Conflicting classifications of pathogenicity ★ ⚠ same residue
CPT2 p.Arg296= Likely benign ★ same residue
CPT2 c.340+1G>C Pathogenic/Likely pathogenic ★★ same condition
CPT2 c.340+5G>A Likely pathogenic ★★ same condition
CPT2 c.341-2A>G Pathogenic/Likely pathogenic ★★ same condition
CPT2 p.Ala67Gly Likely 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/cpt2-p-arg296ter (accessed [today's date]).

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