Genetic Variant DARS2:c.228-12C>T (chr1-173828321-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_018122.5(DARS2):c.228-12C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000117 in 1,370,666 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.000014 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

DARS2
NM_018122.5 intron

Scores

Splicing: ADA: 0.0001542

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.138

Publications

4 publications found

Variant links:

Genes affected

DARS2 (HGNC:25538): (aspartyl-tRNA synthetase 2, mitochondrial) The protein encoded by this gene belongs to the class-II aminoacyl-tRNA synthetase family. It is a mitochondrial enzyme that specifically aminoacylates aspartyl-tRNA. Mutations in this gene are associated with leukoencephalopathy with brainstem and spinal cord involvement and lactate elevation (LBSL). [provided by RefSeq, Nov 2009]

DARS2 Gene-Disease associations (from GenCC):

leukoencephalopathy with brain stem and spinal cord involvement-high lactate syndrome
Inheritance: AR, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, Orphanet
mitochondrial disease
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

DARS2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.78).

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
DARS2	NM_018122.5 link	c.228-12C>T	intron_variant	Intron 2 of 16	ENST00000649689.2	NP_060592.2	Q6PI48Q9H9J7
DARS2	NM_001365212.1 link	c.228-12C>T	intron_variant	Intron 2 of 15		NP_001352141.1
DARS2	NM_001365213.2 link	c.228-12C>T	intron_variant	Intron 2 of 13		NP_001352142.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DARS2	ENST00000649689.2 link	c.228-12C>T		intron_variant	Intron 2 of 16		NM_018122.5	ENSP00000497569.1		Q6PI48

Frequencies

GnomAD3 genomes

AF:

0.0000136

AC:

AN:

147476

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000247

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000102

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000160

AC:

AN:

250472

AF XY:

0.0000221

show subpopulations

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 FIN exome

AF:

0.000185

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000114

AC:

AN:

1223190

Hom.:

Cov.:

AF XY:

0.0000130

AC XY:

AN XY:

614344

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

30106

American (AMR)

AF:

0.00

AC:

AN:

41818

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

20290

East Asian (EAS)

AF:

0.0000332

AC:

AN:

30118

South Asian (SAS)

AF:

0.00

AC:

AN:

81728

European-Finnish (FIN)

AF:

0.0000875

AC:

AN:

45708

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4852

European-Non Finnish (NFE)

AF:

0.00000761

AC:

AN:

919416

Other (OTH)

AF:

0.0000407

AC:

AN:

49154

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.582

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000136

AC:

AN:

147476

Hom.:

Cov.:

AF XY:

0.0000139

AC XY:

AN XY:

71794

show subpopulations

African (AFR)

AF:

0.0000247

AC:

AN:

40548

American (AMR)

AF:

0.00

AC:

AN:

14694

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3396

East Asian (EAS)

AF:

0.00

AC:

AN:

4734

South Asian (SAS)

AF:

0.00

AC:

AN:

4370

European-Finnish (FIN)

AF:

0.000102

AC:

AN:

9792

Middle Eastern (MID)

AF:

0.00

AC:

AN:

302

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

66716

Other (OTH)

AF:

0.00

AC:

AN:

2018

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.600

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.78

CADD

Benign

1.9

(source)

DANN

Benign

0.66

PhyloP100

-0.14

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00015

dbscSNV1_RF

Benign

0.010

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over