rs149840204

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3

The NM_152268.4(PARS2):c.323A>G(p.Glu108Gly) variant causes a missense change. The variant allele was found at a frequency of 0.000166 in 1,614,214 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 Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. E108E) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

PARS2
NM_152268.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 4.00

Variant links:

Genes affected

PARS2 (HGNC:30563): (prolyl-tRNA synthetase 2, mitochondrial) This gene encodes a putative member of the class II 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 proline to tRNA molecules. Mutations have been found in this gene in some patients with Alpers syndrome. [provided by RefSeq, Mar 2015]

PARS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.744

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PARS2	NM_152268.4 linkuse as main transcript	c.323A>G	p.Glu108Gly	missense_variant	2/2	ENST00000371279.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PARS2	ENST00000371279.4 linkuse as main transcript	c.323A>G	p.Glu108Gly	missense_variant	2/2	1	NM_152268.4	P1

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.000576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000127

AC:

AN:

251448

Hom.:

AF XY:

0.000162

AC XY:

AN XY:

135906

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000246

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000170

AC:

249

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000176

AC XY:

128

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000894

Gnomad4 ASJ exome

AF:

0.0000765

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000212

Gnomad4 OTH exome

AF:

0.0000993

GnomAD4 genome

AF:

0.000125

AC:

AN:

152322

Hom.:

Cov.:

AF XY:

0.0000805

AC XY:

AN XY:

74488

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.000576

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000206

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.000110

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000140

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 23, 2021

The c.323A>G (p.E108G) alteration is located in exon 2 (coding exon 1) of the PARS2 gene. This alteration results from a A to G substitution at nucleotide position 323, causing the glutamic acid (E) at amino acid position 108 to be replaced by a glycine (G). The heterozygous missense change is ultra rare in population databases:_x000D_ Based on data from the NHLBI Exome Sequencing Project (ESP), the PARS2 c.323A>G alteration was observed in 2 among 13,006 total alleles studied (0.02%). The c.323A>G alteration was observed in 17 out of 121,396 total alleles (0.01%) studied in the Exome Aggregation Consortium (ExAC) database. This variant is reported in the Database of Single Nucleotide Polymorphisms (dbSNP) as rs149840204. Rare missense alleles commonly exhibit a deleterious effect on protein function (Kryukov, 2007; Tennessen, 2012; please note that some variants may appear to be rare due to ethnic underrepresentation in the database)._x000D_ IF USED, PULL THESE INTO REFERENCES:_x000D_ Kryukov GV, et al. (2007) Am J Hum Genet 80:727-739. Tennessen JA, et al. (2012) Science 337(64):64-69. The altered amino acid is conserved throughout evolution:_x000D_ The p.E108 amino acid is highly conserved in available vertebrate species. The alteration is predicted deleterious by in silico models:_x000D_ The p.E108G alteration is predicted to be probably damaging by Polyphen and deleterious by SIFT in silico analyses. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 03, 2023

This sequence change replaces glutamic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 108 of the PARS2 protein (p.Glu108Gly). This variant is present in population databases (rs149840204, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with PARS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 520549). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Uncertain

0.10

BayesDel_noAF

Pathogenic

0.20

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.51

Eigen

Pathogenic

0.73

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.85

M_CAP

Pathogenic

0.30

MetaRNN

Pathogenic

0.74

MetaSVM

Uncertain

0.60

MutationAssessor

Pathogenic

3.7

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.59

PROVEAN

Pathogenic

-5.3

REVEL

Pathogenic

0.88

Sift

Uncertain

0.017

Sift4G

Uncertain

0.032

Polyphen

0.98

Vest4

0.60

MVP

0.58

MPC

0.81

ClinPred

0.93

GERP RS

5.0

Varity_R

0.41

gMVP

0.84

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over