chr3-78627255-T-A

Variant names:

• chr3-78627255-T-A
• rs7625555
• NM_002941.4:c.3875+66A>T

Variant summary

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

The NM_002941.4(ROBO1):​c.3875+66A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000728 in 1,374,552 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: not found (cov: 33)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: ROBO1 NM_002941.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.884
• Publications: 9 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: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• pituitary hormone deficiency, combined or isolated, 8

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital heart disease

  Inheritance: AR, AD Classification: LIMITED Submitted by: ClinGen
• nystagmus, congenital, autosomal recessive

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

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=-0.87).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002941.4. 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
	ROBO1	NM_002941.4	MANE Select	c.3875+66A>T		intron	N/A	NP_002932.1	Q9Y6N7-1
	ROBO1	NM_133631.4		c.3740+66A>T		intron	N/A	NP_598334.2	Q9Y6N7-5
	ROBO1	NM_001145845.2		c.3575+66A>T		intron	N/A	NP_001139317.1	Q9Y6N7-6

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ROBO1	ENST00000464233.6	TSL:5 MANE Select	c.3875+66A>T		intron	N/A	ENSP00000420321.1	Q9Y6N7-1
	ROBO1	ENST00000495273.5	TSL:1	c.3740+66A>T		intron	N/A	ENSP00000420637.1	Q9Y6N7-5
	ROBO1	ENST00000467549.5	TSL:1	c.3575+66A>T		intron	N/A	ENSP00000417992.1	Q9Y6N7-6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.28e-7 AC: 1 AN: 1374552 Hom.: 0 AF XY: 0.00000148 AC XY: 1 AN XY: 676260

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 31718

American (AMR) AF: 0.00 AC: 0 AN: 35778

Ashkenazi Jewish (ASJ) AF: 0.0000439 AC: 1 AN: 22804

East Asian (EAS) AF: 0.00 AC: 0 AN: 37952

South Asian (SAS) AF: 0.00 AC: 0 AN: 75064

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5458

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1058576

Other (OTH) AF: 0.00 AC: 0 AN: 56916

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	1.3
DANN	Benign	0.43
PhyloP100		-0.88

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: rs7625555; hg19: chr3-78676405;