rs28936376

Positions:

• chr1-53213275-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The ENST00000371486.4(CPT2):​c.1657G>A​(p.Asp553Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,796 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CPT2 ENST00000371486.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 9.91

Genes affected

CPT2 (HGNC:2330): (carnitine palmitoyltransferase 2) The protein encoded by this gene is a nuclear protein which is transported to the mitochondrial inner membrane. Together with carnitine palmitoyltransferase I, the encoded protein oxidizes long-chain fatty acids in the mitochondria. Defects in this gene are associated with mitochondrial long-chain fatty-acid (LCFA) oxidation disorders. [provided by RefSeq, Jul 2008]

(HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant 1-53213275-G-A is Pathogenic according to our data. Variant chr1-53213275-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 8955.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CPT2	NM_000098.3	c.1657G>A	p.Asp553Asn	missense_variant	5/5	ENST00000371486.4	NP_000089.1
CPT2	NM_001330589.2	c.1588G>A	p.Asp530Asn	missense_variant	5/5		NP_001317518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CPT2	ENST00000371486.4	c.1657G>A	p.Asp553Asn	missense_variant	5/5	1	NM_000098.3	ENSP00000360541	P1
	ENST00000629810.1	n.198C>T		non_coding_transcript_exon_variant	1/3	5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251166 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135802

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461796 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727196

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Carnitine palmitoyl transferase II deficiency, myopathic form Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 1995

- -

Carnitine palmitoyltransferase II deficiency Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 28, 2024

Variant summary: CPT2 c.1657G>A (p.Asp553Asn) results in a conservative amino acid change located in the Choline/carnitine acyltransferase domain (IPR039551) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 251166 control chromosomes. c.1657G>A has been reported in the literature in at least 1 individual affected with Carnitine Palmitoyltransferase II Deficiency (example, Verderio_1995, Corti_2008). At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect in vitro results in a drastic reduction in enzyme activity and steady state protein levels (example, Verderio_1995). The following publications have been ascertained in the context of this evaluation (PMID: 17936304, 7711730). ClinVar contains an entry for this variant (Variation ID: 8955). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Carnitine palmitoyl transferase II deficiency, severe infantile form Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

May 10, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Pathogenic	0.14
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.82	D;.;T;T;T
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	0.98	D;D;D;D;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.3	H;.;.;.;.
MutationTaster	Benign	1.0	A
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-4.2	D;.;.;.;.
REVEL	Pathogenic	0.85
Sift	Uncertain	0.0050	D;.;.;.;.
Sift4G	Benign	0.070	T;.;.;.;.
Polyphen		0.99	D;.;.;.;.
Vest4		0.96
MutPred		0.99		Gain of MoRF binding (P = 0.0523);.;.;.;.;
MVP		1.0
MPC		0.53
ClinPred		1.0	D
GERP RS		5.9
Varity_R		0.83
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs28936376; hg19: chr1-53678947;