11-124869032-G-A

Variant names:

• chr11-124869032-G-A
• rs777244046
• NM_022370.4:c.391G>A

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_022370.4(ROBO3):​c.391G>A​(p.Gly131Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000069 in 1,449,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: ROBO3 NM_022370.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.74
• Publications: 1 publications found

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]

ROBO3 Gene-Disease associations (from GenCC):

• gaze palsy, familial horizontal, with progressive scoliosis 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, ClinGen, G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.756

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022370.4. 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
	ROBO3	NM_022370.4	MANE Select	c.391G>A	p.Gly131Arg	missense	Exon 2 of 28	NP_071765.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ROBO3	ENST00000397801.6	TSL:1 MANE Select	c.391G>A	p.Gly131Arg	missense	Exon 2 of 28	ENSP00000380903.1	Q96MS0-1
	ROBO3	ENST00000538940.5	TSL:5	c.325G>A	p.Gly109Arg	missense	Exon 1 of 27	ENSP00000441797.1	F5GWJ5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1449886 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 720114

African (AFR) AF: 0.00 AC: 0 AN: 33234

American (AMR) AF: 0.00 AC: 0 AN: 43108

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25764

East Asian (EAS) AF: 0.00 AC: 0 AN: 39176

South Asian (SAS) AF: 0.00 AC: 0 AN: 84394

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51654

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5744

European-Non Finnish (NFE) AF: 9.03e-7 AC: 1 AN: 1107022

Other (OTH) AF: 0.00 AC: 0 AN: 59790

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Uncertain	0.072	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	34
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.35	T
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Benign	0.054	D
MetaRNN	Pathogenic	0.76	D
MetaSVM	Benign	-0.74	T
MutationAssessor	Benign	-0.14	N
PhyloP100		6.7
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-6.4	D
REVEL	Uncertain	0.51
Sift	Uncertain	0.014	D
Sift4G	Pathogenic	0.0010	D
Polyphen		1.0	D
Vest4		0.76
MutPred		0.70		Gain of MoRF binding (P = 0.0078)
MVP		0.70
MPC		2.2
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.68
gMVP		0.90
Mutation Taster		=26/74	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: rs777244046; hg19: chr11-124738928;