3-94049454-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_001174150.2(ARL13B):c.1073G>A(p.Arg358Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000118 in 1,610,084 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R358G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000040 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

ARL13B
NM_001174150.2 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 3.85

Variant links:

Genes affected

ARL13B (HGNC:25419): (ADP ribosylation factor like GTPase 13B) This gene encodes a member of the ADP-ribosylation factor-like family. The encoded protein is a small GTPase that contains both N-terminal and C-terminal guanine nucleotide-binding motifs. This protein is localized in the cilia and plays a role in cilia formation and in maintenance of cilia. Mutations in this gene are the cause of Joubert syndrome 8. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Mar 2010]

ARL13B links:

DHFR2 (HGNC:27309): (dihydrofolate reductase 2) Enables dihydrofolate reductase activity and mRNA binding activity. Involved in tetrahydrofolate metabolic process and thymidine biosynthetic process. Located in mitochondrial inner membrane and mitochondrial matrix. [provided by Alliance of Genome Resources, Apr 2022]

DHFR2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.2677896).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARL13B	NM_001174150.2 link	c.1073G>A	p.Arg358Gln	missense_variant	Exon 8 of 10	ENST00000394222.8	NP_001167621.1	Q3SXY8-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARL13B	ENST00000394222.8 link	c.1073G>A	p.Arg358Gln	missense_variant	Exon 8 of 10	1	NM_001174150.2	ENSP00000377769.3		Q3SXY8-1

Frequencies

GnomAD3 genomes

AF:

0.0000395

AC:

AN:

151778

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000200

AC:

AN:

249608

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

134880

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.0000585

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000891

AC:

AN:

1458306

Hom.:

Cov.:

AF XY:

0.0000138

AC XY:

AN XY:

725220

show subpopulations

Gnomad4 AFR exome

AF:

0.0000900

Gnomad4 AMR exome

AF:

0.0000675

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000352

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000395

AC:

AN:

151778

Hom.:

Cov.:

AF XY:

0.0000405

AC XY:

AN XY:

74114

show subpopulations

Gnomad4 AFR

AF:

0.000121

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Joubert syndrome 8

Uncertain:2

Jan 03, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine with glutamine at codon 358 of the ARL13B protein (p.Arg358Gln). The arginine residue is moderately conserved and there is a small physicochemical difference between arginine and glutamine. This variant is present in population databases (rs369942016, ExAC 0.02%). This variant has not been reported in the literature in individuals with ARL13B-related conditions. ClinVar contains an entry for this variant (Variation ID: 634456). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Jan 01, 2019

Genomic Research Center, Shahid Beheshti University of Medical Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.36

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.16

.;.;T;T

Eigen

Uncertain

0.37

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.95

D;D;.;D

M_CAP

Benign

0.027

MetaRNN

Benign

0.27

T;T;T;T

MetaSVM

Benign

-0.57

MutationAssessor

Benign

1.2

.;.;L;L

PrimateAI

Benign

0.45

PROVEAN

Benign

-1.4

N;N;N;N

REVEL

Benign

0.060

Sift

Uncertain

0.0070

D;D;D;D

Sift4G

Benign

0.13

T;T;T;T

Polyphen

0.89, 0.62

.;P;P;P

Vest4

0.53

MVP

0.68

MPC

0.19

ClinPred

0.21

GERP RS

4.2

Varity_R

0.11

gMVP

0.37

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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