3-94039955-T-C

Variant names:

• chr3-94039955-T-C
• rs786205563
• NM_001174150.2:c.765T>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001174150.2(ARL13B):​c.765T>C​(p.Asn255Asn) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000656 in 152,332 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: ARL13B NM_001174150.2 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.120
• Publications: 2 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: Orphanet, ClinGen
• Joubert syndrome 8

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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.55).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARL13B	NM_001174150.2	MANE Select	c.765T>C	p.Asn255Asn	synonymous	Exon 6 of 10	NP_001167621.1	Q3SXY8-1
	ARL13B	NM_182896.3		c.765T>C	p.Asn255Asn	synonymous	Exon 6 of 11	NP_878899.1	Q3SXY8-1
	ARL13B	NM_001321328.2		c.720T>C	p.Asn240Asn	synonymous	Exon 7 of 11	NP_001308257.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ARL13B	ENST00000394222.8	TSL:1 MANE Select	c.765T>C	p.Asn255Asn	synonymous	Exon 6 of 10	ENSP00000377769.3	Q3SXY8-1
	ARL13B	ENST00000471138.5	TSL:1	c.765T>C	p.Asn255Asn	synonymous	Exon 6 of 11	ENSP00000420780.1	Q3SXY8-1
	ARL13B	ENST00000535334.5	TSL:1	c.456T>C	p.Asn152Asn	synonymous	Exon 5 of 9	ENSP00000445145.1	Q3SXY8-3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152214 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome AF: 0.00000656 AC: 1 AN: 152332 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74502

African (AFR) AF: 0.00 AC: 0 AN: 41586

American (AMR) AF: 0.00 AC: 0 AN: 15296

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5186

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10624

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68030

Other (OTH) AF: 0.00 AC: 0 AN: 2110

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.55
CADD	Benign	4.5
DANN	Benign	0.38
PhyloP100		-0.12

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: rs786205563; hg19: chr3-93758799;