rs1553169799

Positions:

• chr1-53211179-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_000098.3(CPT2):​c.1505T>C​(p.Ile502Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,456,744 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). Synonymous variant affecting the same amino acid position (i.e. I502I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CPT2 NM_000098.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 8.02

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]

CPT2 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 8 uncertain in NM_000098.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.976
• PP5: Variant 1-53211179-T-C is Pathogenic according to our data. Variant chr1-53211179-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 550000.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CPT2	NM_000098.3	c.1505T>C	p.Ile502Thr	missense_variant	4/5	ENST00000371486.4	NP_000089.1
CPT2	NM_001330589.2	c.1505T>C	p.Ile502Thr	missense_variant	4/5		NP_001317518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CPT2	ENST00000371486.4	c.1505T>C	p.Ile502Thr	missense_variant	4/5	1	NM_000098.3	ENSP00000360541.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1456744 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 723886

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: 9.02e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Carnitine palmitoyltransferase II deficiency Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 25, 2023

For these reasons, this variant has been classified as Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CPT2 protein function. ClinVar contains an entry for this variant (Variation ID: 550000). This missense change has been observed in individual(s) with carnitine palmitoyltransferase II deficiency (PMID: 10862092, 30957255). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 502 of the CPT2 protein (p.Ile502Thr). -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Nov 22, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.85
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.70	D;.;.;T;T
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;D;D;D
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Uncertain	2.7	M;.;.;.;.
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-3.9	D;.;.;.;.
REVEL	Pathogenic	0.88
Sift	Uncertain	0.0030	D;.;.;.;.
Sift4G	Uncertain	0.0050	D;.;.;.;.
Polyphen		0.98	D;.;.;.;.
Vest4		0.90
MutPred		0.93		Gain of glycosylation at I502 (P = 0.0028);Gain of glycosylation at I502 (P = 0.0028);Gain of glycosylation at I502 (P = 0.0028);Gain of glycosylation at I502 (P = 0.0028);Gain of glycosylation at I502 (P = 0.0028);
MVP		1.0
MPC		0.62
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.48
gMVP		0.77

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: rs1553169799; hg19: chr1-53676851;