NM_022370.4:c.2113T>A

Variant names:

• chr11-124875150-T-A
• rs121918272
• NM_022370.4:c.2113T>A

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 4P and 1B. PM2 PM5 BP4

The NM_022370.4(ROBO3):​c.2113T>A​(p.Ser705Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 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. S705P) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ROBO3 NM_022370.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.59
• Publications: 4 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: Labcorp Genetics (formerly Invitae), G2P, ClinGen, 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
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-124875150-T-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2175.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.30941117).

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ROBO3	NM_022370.4	MANE Select	c.2113T>A	p.Ser705Thr	missense	Exon 14 of 28	NP_071765.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ROBO3	ENST00000397801.6	TSL:1 MANE Select	c.2113T>A	p.Ser705Thr	missense	Exon 14 of 28	ENSP00000380903.1
	ROBO3	ENST00000538940.5	TSL:5	c.2047T>A	p.Ser683Thr	missense	Exon 13 of 27	ENSP00000441797.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000404 AC: 1 AN: 247280 AF XY: 0.00000745

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: 0.00000893

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000827 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	22
DANN	Benign	0.97
DEOGEN2	Benign	0.039	T
Eigen	Benign	0.089
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.31	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.9	L
PhyloP100		1.6
PrimateAI	Benign	0.47	T
PROVEAN	Benign	0.12	N
REVEL	Benign	0.087
Sift	Benign	0.31	T
Sift4G	Uncertain	0.014	D
Polyphen		0.77	P
Vest4		0.28
MutPred		0.51		Loss of sheet (P = 0.0817)
MVP		0.59
MPC		0.36
ClinPred		0.72	D
GERP RS		4.2
Varity_R		0.32
gMVP		0.23
Mutation Taster		=77/23	polymorphism

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: rs121918272; hg19: chr11-124745046;