rs770782663

Variant names:

• chr10-102685871-C-T
• rs770782663
• NM_004311.4:c.446G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP3_Moderate PP5

The NM_004311.4(ARL3):​c.446G>A​(p.Arg149His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,844 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R149C) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: ARL3 NM_004311.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 7.91
• Publications: 4 publications found

Genes affected

ARL3 (HGNC:694): (ADP ribosylation factor like GTPase 3) Enables GDP binding activity; GTP binding activity; and microtubule binding activity. Involved in several processes, including cilium assembly; protein localization to cilium; and small GTPase mediated signal transduction. Acts upstream of or within post-Golgi vesicle-mediated transport. Located in several cellular components, including microtubule cytoskeleton; midbody; and photoreceptor connecting cilium. Implicated in Joubert syndrome and retinitis pigmentosa 83. [provided by Alliance of Genome Resources, Apr 2022]

ARL3 Gene-Disease associations (from GenCC):

• retinitis pigmentosa 83

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• Joubert syndrome 35

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, Illumina
• Joubert syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a chain ADP-ribosylation factor-like protein 3 (size 180) in uniprot entity ARL3_HUMAN there are 5 pathogenic changes around while only 2 benign (71%) in NM_004311.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-102685872-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 587372.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.845
• PP5: Variant 10-102685871-C-T is Pathogenic according to our data. Variant chr10-102685871-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 424963.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004311.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARL3	NM_004311.4	MANE Select	c.446G>A	p.Arg149His	missense	Exon 5 of 6	NP_004302.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARL3	ENST00000260746.6	TSL:1 MANE Select	c.446G>A	p.Arg149His	missense	Exon 5 of 6	ENSP00000260746.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251352 AF XY: 0.00000736

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: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461844 Hom.: 0 Cov.: 33 AF XY: 0.00000688 AC XY: 5 AN XY: 727220

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44712

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.0000348 AC: 3 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111990

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
1	1	-	not provided (2)
1	-	-	Joubert syndrome 35 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Uncertain	0.049	T
BayesDel_noAF	Uncertain	-0.070
CADD	Pathogenic	33
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.58	D
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Uncertain	0.51	D
MutationAssessor	Uncertain	2.6	M
PhyloP100		7.9
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.67
Sift	Benign	0.036	D
Sift4G	Uncertain	0.014	D
Polyphen		1.0	D
Vest4		0.74
MutPred		0.59		Loss of stability (P = 0.1)
MVP		0.83
MPC		1.4
ClinPred		0.99	D
GERP RS		5.0
Varity_R		0.40
gMVP		0.48
Mutation Taster		=17/83	disease causing

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

Other links and lift over

dbSNP: rs770782663; hg19: chr10-104445628; COSMIC: COSV53299301;