rs145189950

Positions:

• chr6-87524643-C-G
• chr6-87524643-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS2

The NM_020320.5(RARS2):​c.888G>C​(p.Thr296Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00107 in 1,610,434 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0012 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (2 hom.)
• Consequence: RARS2 NM_020320.5 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:4
• Conservation: PhyloP100: -0.621

Genes affected

RARS2 (HGNC:21406): (arginyl-tRNA synthetase 2, mitochondrial) This nuclear gene encodes a protein that localizes to the mitochondria, where it catalyzes the transfer of L-arginine to its cognate tRNA, an important step in translation of mitochondrially-encoded proteins. Defects in this gene are a cause of pontocerebellar hypoplasia type 6 (PCH6). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

RARS2 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).
• BP6: Variant 6-87524643-C-G is Benign according to our data. Variant chr6-87524643-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 138896.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=2, Benign=2}.
• BP7: Synonymous conserved (PhyloP=-0.621 with no splicing effect.
• BS2: High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RARS2	NM_020320.5	c.888G>C	p.Thr296Thr	synonymous_variant	11/20	ENST00000369536.10	NP_064716.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RARS2	ENST00000369536.10	c.888G>C	p.Thr296Thr	synonymous_variant	11/20	1	NM_020320.5	ENSP00000358549.5

Frequencies

GnomAD3 genomes AF: 0.00119 AC: 181 AN: 152090 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.0173

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00142

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00143

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.00130 AC: 325 AN: 250892 Hom.: 0 AF XY: 0.00131 AC XY: 178 AN XY: 135646

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.000174

Gnomad ASJ exome AF: 0.0102

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000392

Gnomad FIN exome AF: 0.00131

Gnomad NFE exome AF: 0.00149

Gnomad OTH exome AF: 0.000816

GnomAD4 exome AF: 0.00106 AC: 1546 AN: 1458226 Hom.: 2 Cov.: 30 AF XY: 0.00112 AC XY: 815 AN XY: 725670

Gnomad4 AFR exome AF: 0.0000898

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.0123

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000429

Gnomad4 FIN exome AF: 0.00119

Gnomad4 NFE exome AF: 0.000916

Gnomad4 OTH exome AF: 0.00164

GnomAD4 genome AF: 0.00119 AC: 181 AN: 152208 Hom.: 0 Cov.: 32 AF XY: 0.00112 AC XY: 83 AN XY: 74416

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.0173

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000415

Gnomad4 FIN AF: 0.00142

Gnomad4 NFE AF: 0.00143

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.00208 Hom.: 0

Bravo AF: 0.00105

EpiCase AF: 0.00136

EpiControl AF: 0.00184

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:1

Benign, criteria provided, single submitter	clinical testing	GeneDx	May 08, 2013	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Jul 28, 2015	- -

Pontocerebellar hypoplasia type 6 Uncertain:1 Benign:1

Likely benign, no assertion criteria provided	clinical testing	Natera, Inc.	Oct 24, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Oct 01, 2023	RARS2: BP4, BP7 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	0.61
DANN	Benign	0.48

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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

Other links and lift over

dbSNP: rs145189950; hg19: chr6-88234361; COSMIC: COSV65761112;