rs771933896

Variant names:

• chr3-94003907-G-A
• rs771933896
• NM_001174150.2:c.379G>A

Your query was ambiguous. Multiple possible variants found:

• chr3-94003907-G-A
• chr3-94003907-G-T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001174150.2(ARL13B):​c.379G>A​(p.Val127Met) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,026 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V127L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: ARL13B NM_001174150.2 missense, splice_region
• Scores: Splicing: ADA: 0.9638
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 10.0
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Joubert syndrome

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Joubert syndrome 8

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.876

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001174150.2. 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
	ARL13B	NM_001174150.2	MANE Select	c.379G>A	p.Val127Met	missense splice_region	Exon 3 of 10	NP_001167621.1
	ARL13B	NM_182896.3		c.379G>A	p.Val127Met	missense splice_region	Exon 3 of 11	NP_878899.1
	ARL13B	NM_001321328.2		c.334G>A	p.Val112Met	missense splice_region	Exon 4 of 11	NP_001308257.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARL13B	ENST00000394222.8	TSL:1 MANE Select	c.379G>A	p.Val127Met	missense splice_region	Exon 3 of 10	ENSP00000377769.3
	ARL13B	ENST00000471138.5	TSL:1	c.379G>A	p.Val127Met	missense splice_region	Exon 3 of 11	ENSP00000420780.1
	ARL13B	ENST00000535334.5	TSL:1	c.70G>A	p.Val24Met	missense splice_region	Exon 2 of 9	ENSP00000445145.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461026 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726832

African (AFR) AF: 0.00 AC: 0 AN: 33458

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26114

East Asian (EAS) AF: 0.00 AC: 0 AN: 39608

South Asian (SAS) AF: 0.00 AC: 0 AN: 86234

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53180

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 9.00e-7 AC: 1 AN: 1111596

Other (OTH) AF: 0.0000331 AC: 2 AN: 60360

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.27	T
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.68	T
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.88	D
MetaSVM	Uncertain	0.17	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		10
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-1.5	N
REVEL	Uncertain	0.64
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0030	D
Polyphen		0.99	D
Vest4		0.91
MutPred		0.63		Gain of catalytic residue at V127 (P = 0.0169)
MVP		0.79
MPC		0.43
ClinPred		0.98	D
GERP RS		5.9
Varity_R		0.47
gMVP		0.83
Mutation Taster		=8/92	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.96
dbscSNV1_RF	Benign	0.67
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: rs771933896; hg19: chr3-93722751;