NM_000387.6:c.505dupT

Variant names:

• chr3-48862571-T-TA
• rs1553684897
• NM_000387.6:c.505dupT

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000387.6(SLC25A20):​c.505dupT​(p.Tyr169LeufsTer15) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC25A20 NM_000387.6 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.30
• Publications: 0 publications found

Genes affected

SLC25A20 (HGNC:1421): (solute carrier family 25 member 20) This gene product is one of several closely related mitochondrial-membrane carrier proteins that shuttle substrates between cytosol and the intramitochondrial matrix space. This protein mediates the transport of acylcarnitines into mitochondrial matrix for their oxidation by the mitochondrial fatty acid-oxidation pathway. Mutations in this gene are associated with carnitine-acylcarnitine translocase deficiency, which can cause a variety of pathological conditions such as hypoglycemia, cardiac arrest, hepatomegaly, hepatic dysfunction and muscle weakness, and is usually lethal in new born and infants. [provided by RefSeq, Jul 2008]

PRKAR2A-AS1 (HGNC:40471): (PRKAR2A antisense RNA 1)

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-48862571-T-TA is Pathogenic according to our data. Variant chr3-48862571-T-TA is described in ClinVar as Pathogenic. ClinVar VariationId is 460440.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000387.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC25A20	NM_000387.6	MANE Select	c.505dupT	p.Tyr169LeufsTer15	frameshift	Exon 5 of 9	NP_000378.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC25A20	ENST00000319017.5	TSL:1 MANE Select	c.505dupT	p.Tyr169LeufsTer15	frameshift	Exon 5 of 9	ENSP00000326305.4
	SLC25A20	ENST00000430379.5	TSL:3	c.286dupT	p.Tyr96LeufsTer15	frameshift	Exon 3 of 7	ENSP00000388986.1
	SLC25A20	ENST00000440964.1	TSL:2	n.*335dupT		non_coding_transcript_exon	Exon 6 of 10	ENSP00000388563.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Carnitine acylcarnitine translocase deficiency Pathogenic:1

May 10, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in SLC25A20 are known to be pathogenic (PMID: 25614308). This variant has not been reported in the literature in individuals with SLC25A20-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Tyr169Leufs*15) in the SLC25A20 gene. It is expected to result in an absent or disrupted protein product.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		9.3
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1553684897; hg19: chr3-48900004;