NM_000387.6:c.773G>T

Variant names:

• chr3-48858577-C-A
• rs35989076
• NM_000387.6:c.773G>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_000387.6(SLC25A20):​c.773G>T​(p.Arg258Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,892 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R258Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: SLC25A20 NM_000387.6 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.80
• 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: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a repeat Solcar 3 (size 86) in uniprot entity MCAT_HUMAN there are 7 pathogenic changes around while only 1 benign (88%) in NM_000387.6
• PM2: Very rare variant in population databases, with high coverage

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.773G>T	p.Arg258Leu	missense	Exon 8 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.773G>T	p.Arg258Leu	missense	Exon 8 of 9	ENSP00000326305.4
	SLC25A20	ENST00000430379.5	TSL:3	c.554G>T	p.Arg185Leu	missense	Exon 6 of 7	ENSP00000388986.1
	SLC25A20	ENST00000440964.1	TSL:2	n.*603G>T		non_coding_transcript_exon	Exon 9 of 10	ENSP00000388563.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461892 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727246

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000450 AC: 5 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.65	D
Eigen	Benign	-0.077
Eigen_PC	Benign	-0.022
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.95	D
M_CAP	Uncertain	0.10	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		1.8
PrimateAI	Benign	0.30	T
PROVEAN	Pathogenic	-5.3	D
REVEL	Uncertain	0.51
Sift	Benign	0.094	T
Sift4G	Benign	0.085	T
Polyphen		0.060	B
Vest4		0.68
MutPred		0.53		Loss of methylation at R258 (P = 0.0567)
MVP		0.88
MPC		0.35
ClinPred		0.98	D
GERP RS		2.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.40
gMVP		0.90
Mutation Taster		=41/59	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs35989076; hg19: chr3-48896010;