rs554931092

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_006567.5(FARS2):c.550G>A(p.Asp184Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000942 in 1,613,036 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 (★★).

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000083 ( 0 hom. )

Consequence

FARS2
NM_006567.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 9.45

Variant links:

Genes affected

FARS2 (HGNC:21062): (phenylalanyl-tRNA synthetase 2, mitochondrial) This gene encodes a protein that transfers phenylalanine to its cognate tRNA. This protein localizes to the mitochondrion and plays a role in mitochondrial protein translation. Mutations in this gene can cause combined oxidative phosphorylation deficiency 14 (Alpers encephalopathy). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

FARS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.868

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FARS2	NM_006567.5 linkuse as main transcript	c.550G>A	p.Asp184Asn	missense_variant	2/7	ENST00000274680.9	NP_006558.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
FARS2	ENST00000274680.9 linkuse as main transcript	c.550G>A	p.Asp184Asn	missense_variant	2/7	1	NM_006567.5	ENSP00000274680	P1
FARS2	ENST00000324331.10 linkuse as main transcript	c.550G>A	p.Asp184Asn	missense_variant	2/7	1		ENSP00000316335	P1
FARS2	ENST00000648580.1 linkuse as main transcript	c.550G>A	p.Asp184Asn	missense_variant, NMD_transcript_variant	2/9			ENSP00000497889

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152076

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00151

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.000256

AC:

AN:

250094

Hom.:

AF XY:

0.000185

AC XY:

AN XY:

135216

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00159

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000529

Gnomad OTH exome

AF:

0.000490

GnomAD4 exome

AF:

0.0000828

AC:

121

AN:

1460844

Hom.:

Cov.:

AF XY:

0.0000729

AC XY:

AN XY:

726722

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00148

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000414

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.000204

AC:

AN:

152192

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74404

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00151

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.0000844

Hom.:

Bravo

AF:

0.000431

ExAC

AF:

0.000148

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Combined oxidative phosphorylation defect type 14

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 18, 2022	This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 184 of the FARS2 protein (p.Asp184Asn). This variant is present in population databases (rs554931092, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with FARS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 214340). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on FARS2 protein function. 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine	Jun 13, 2018	- -

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Dec 14, 2021	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 17, 2020	- -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 23, 2020

The c.550G>A (p.D184N) alteration is located in exon 2 (coding exon 1) of the FARS2 gene. This alteration results from a G to A substitution at nucleotide position 550, causing the aspartic acid (D) at amino acid position 184 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

See cases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratorio de Genetica e Diagnostico Molecular, Hospital Israelita Albert Einstein

Oct 21, 2020

- -

Combined oxidative phosphorylation defect type 14;C5569007:Hereditary spastic paraplegia 77

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Sep 01, 2022

This variant has not been reported in the literature but is present in the Genome Aggregation Database (Highest reported MAF 0.1% (23/15260) (https://gnomad.broadinstitute.org/variant/6-5369120-G-A?dataset=gnomad_r3). This variant is present in ClinVar (Variation ID:214340). Evolutionary conservation and computational predictive tools suggest that this variant may impact the protein. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.11

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.50

D;D

Eigen

Pathogenic

0.94

Eigen_PC

Pathogenic

0.84

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

0.99

.;D

M_CAP

Uncertain

0.19

MetaRNN

Pathogenic

0.87

D;D

MetaSVM

Uncertain

0.46

MutationAssessor

Pathogenic

4.1

H;H

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.61

PROVEAN

Pathogenic

-4.7

D;D

REVEL

Pathogenic

0.69

Sift

Uncertain

0.013

D;D

Sift4G

Uncertain

0.018

D;D

Polyphen

1.0

D;D

Vest4

0.91

MutPred

0.85

Loss of disorder (P = 0.1335);Loss of disorder (P = 0.1335);

MVP

0.99

MPC

0.64

ClinPred

0.50

GERP RS

5.7

Varity_R

0.62

gMVP

0.77

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