3-78600231-G-C

Variant names:

• chr3-78600231-G-C
• rs1703089925
• NM_002941.4:c.4823C>G

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_002941.4(ROBO1):​c.4823C>G​(p.Ser1608*) variant causes a stop gained change involving the alteration of a conserved nucleotide. 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 (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ROBO1 NM_002941.4 stop_gained
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.91
• Publications: 0 publications found

Genes affected

ROBO1 (HGNC:10249): (roundabout guidance receptor 1) Bilateral symmetric nervous systems have special midline structures that establish a partition between the two mirror image halves. Some axons project toward and across the midline in response to long-range chemoattractants emanating from the midline. The product of this gene is a member of the immunoglobulin gene superfamily and encodes an integral membrane protein that functions in axon guidance and neuronal precursor cell migration. This receptor is activated by SLIT-family proteins, resulting in a repulsive effect on glioma cell guidance in the developing brain. A related gene is located at an adjacent region on chromosome 3. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2009]

ROBO1 Gene-Disease associations (from GenCC):

• neurooculorenal syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• pituitary hormone deficiency, combined or isolated, 8

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• pituitary stalk interruption syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 3-78600231-G-C is Pathogenic according to our data. Variant chr3-78600231-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 996101.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ROBO1	NM_002941.4	c.4823C>G	p.Ser1608*	stop_gained	Exon 30 of 31	ENST00000464233.6	NP_002932.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ROBO1	ENST00000464233.6	c.4823C>G	p.Ser1608*	stop_gained	Exon 30 of 31	5	NM_002941.4	ENSP00000420321.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Neurooculorenal syndrome Pathogenic:1

Apr 05, 2023

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Bilateral renal agenesis Pathogenic:1

Jan 09, 2021

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

This variant was reported as ROBO1 [NM_002941.3] c.4823C>G p.(Ser1608*) in an individual (Family 1 female fetus 1; Family 1 female fetus 2; Family 1 brother 1) with bilateral kidney agenesis, genital hypoplasia, hypoplasia of halluces, intestinal malrotation, and anteriorly displaced anus, corpus callosum agenesis; dysmorphic features (frontal bossing, curled ears, and curled retinal arteries), chronic constipation requiring medication, nocturnal and diurnal enuresis, delayed motor development (he was 2 years and 3 months before walking) as well as delayed social and emotional development. (PMID: 29194579 (rasmussen2017)). Inheritance was reported as recessive (compound-heterozygous) (maternal). The variant was reviewed according to current ACMG recommendations and classified as Likely Pathogenic (criteria: PVS1_VeryStrong, PM2_Supporting) at the variant level; the gene-disease association is currently not established in curated databases. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	44
DANN	Uncertain	1.0
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.1
FATHMM_MKL	Pathogenic	0.99	D
PhyloP100		7.9
Vest4		0.79
GERP RS		5.6
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1703089925; hg19: chr3-78649381;