rs121918276

chr11-124868837-A-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_022370.4(ROBO3):c.196A>C(p.Ile66Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ROBO3 NM_022370.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.29

Genes affected

ROBO3 (HGNC:13433): (roundabout guidance receptor 3) This gene is a member of the Roundabout (ROBO) gene family that controls neurite outgrowth, growth cone guidance, and axon fasciculation. ROBO proteins are a subfamily of the immunoglobulin transmembrane receptor superfamily. SLIT proteins 1-3, a family of secreted chemorepellants, are ligands for ROBO proteins and SLIT/ROBO interactions regulate myogenesis, leukocyte migration, kidney morphogenesis, angiogenesis, and vasculogenesis in addition to neurogenesis. This gene, ROBO3, has a putative extracellular domain with five immunoglobulin (Ig)-like loops and three fibronectin (Fn) type III motifs, a transmembrane segment, and a cytoplasmic tail with three conserved signaling motifs: CC0, CC2, and CC3 (CC for conserved cytoplasmic). Unlike other ROBO family members, ROBO3 lacks motif CC1. The ROBO3 gene regulates axonal navigation at the ventral midline of the neural tube. In mouse, loss of Robo3 results in a complete failure of commissural axons to cross the midline throughout the spinal cord and the hindbrain. Mutations ROBO3 result in horizontal gaze palsy with progressive scoliosis (HGPPS); an autosomal recessive disorder characterized by congenital absence of horizontal gaze, progressive scoliosis, and failure of the corticospinal and somatosensory axon tracts to cross the midline in the medulla. [provided by RefSeq, May 2019]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a domain Ig-like C2-type 1 (size 96) in uniprot entity ROBO3_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_022370.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.889
• PP5: Variant 11-124868837-A-C is Pathogenic according to our data. Variant chr11-124868837-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2180.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ROBO3	NM_022370.4	c.196A>C	p.Ile66Leu	missense_variant	2/28	ENST00000397801.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ROBO3	ENST00000397801.6	c.196A>C	p.Ile66Leu	missense_variant	2/28	1	NM_022370.4	P2
ROBO3	ENST00000538940.5	c.130A>C	p.Ile44Leu	missense_variant	1/27	5		A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Gaze palsy, familial horizontal, with progressive scoliosis 1 Pathogenic:2

Likely pathogenic, criteria provided, single submitter	curation	Institute of Human Genetics, University of Leipzig Medical Center	Jan 09, 2021	This ROBO3 variant was reported as Pathogenic​ in PMID: 15105459 with original nomenclature reported as 196A>C, I66L. Variant was re-classified as Likely Pathogenic based on the criteria PM1_Moderate, PM2_Supporting, PM3_Moderate, PP3_Supporting, PP4_Supporting. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 04, 2004	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
Cadd	Pathogenic	26
Dann	Uncertain	0.99
DEOGEN2	Benign	0.15	T;.
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Benign	0.028	D
MetaRNN	Pathogenic	0.89	D;D
MetaSVM	Uncertain	-0.26	T
MutationAssessor	Benign	1.1	L;.
MutationTaster	Benign	1.0	A;A
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-1.6	N;N
REVEL	Uncertain	0.54
Sift	Uncertain	0.0030	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.99	D;.
Vest4		0.67
MutPred		0.84		Loss of sheet (P = 0.0817);.;
MVP		0.72
MPC		2.0
ClinPred		0.94	D
GERP RS		5.3
Varity_R		0.51
gMVP		0.73

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs121918276; hg19: chr11-124738733;