13-110706070-T-G

Variant names:

• chr13-110706070-T-G
• NM_024537.4:c.24A>C
• CARS2 p.Pro8Pro

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_024537.4(CARS2):​c.24A>C​(p.Pro8Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P8P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CARS2 NM_024537.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.59
• Publications: 0 publications found

Genes affected

CARS2 (HGNC:25695): (cysteinyl-tRNA synthetase 2, mitochondrial) This gene encodes a putative member of the class I family of aminoacyl-tRNA synthetases. These enzymes play a critical role in protein biosynthesis by charging tRNAs with their cognate amino acids. This protein is encoded by the nuclear genome but is likely to be imported to the mitochondrion where it is thought to catalyze the ligation of cysteine to tRNA molecules. A splice-site mutation in this gene has been associated with a novel progressive myoclonic epilepsy disease with similar symptoms to MERRF syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2017]

CARS2 Gene-Disease associations (from GenCC):

• combined oxidative phosphorylation defect type 27

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Laboratory for Molecular Medicine, Orphanet
• mitochondrial disease

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP7: Synonymous conserved (PhyloP=-2.59 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024537.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CARS2	NM_024537.4	MANE Select	c.24A>C	p.Pro8Pro	synonymous	Exon 1 of 15	NP_078813.1	Q9HA77
	CARS2	NM_001352253.3		c.24A>C	p.Pro8Pro	synonymous	Exon 1 of 9	NP_001339182.1
	CARS2	NM_001352252.2		c.-776+301A>C		intron	N/A	NP_001339181.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CARS2	ENST00000257347.9	TSL:1 MANE Select	c.24A>C	p.Pro8Pro	synonymous	Exon 1 of 15	ENSP00000257347.4	Q9HA77
	CARS2	ENST00000939453.1		c.24A>C	p.Pro8Pro	synonymous	Exon 1 of 15	ENSP00000609512.1
	CARS2	ENST00000890914.1		c.24A>C	p.Pro8Pro	synonymous	Exon 1 of 15	ENSP00000560973.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1184966 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 579242

African (AFR) AF: 0.00 AC: 0 AN: 23898

American (AMR) AF: 0.00 AC: 0 AN: 15510

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 17308

East Asian (EAS) AF: 0.00 AC: 0 AN: 25378

South Asian (SAS) AF: 0.00 AC: 0 AN: 48694

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 27006

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4422

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 975336

Other (OTH) AF: 0.00 AC: 0 AN: 47414

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	5.8
DANN	Benign	0.51
PhyloP100		-2.6
PromoterAI		-0.11	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr13-111358417;