NM_001242908.2:c.750_752delGCA

Variant names:

• chr1-37612794-TTGC-T
• rs563949840
• NM_001242908.2:c.750_752delGCA

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP3

The NM_001242908.2(RSPO1):​c.750_752delGCA​(p.Gln251del) variant causes a disruptive inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,460,376 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: RSPO1 NM_001242908.2 disruptive_inframe_deletion
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.58
• Publications: 0 publications found

Genes affected

RSPO1 (HGNC:21679): (R-spondin 1) This gene encodes a secreted activator protein with two cysteine-rich, furin-like domains and one thrombospondin type 1 domain. The encoded protein is a ligand for leucine-rich repeat-containing G-protein coupled receptors (LGR proteins) and positively regulates the Wnt signaling pathway. In mice, the protein induces the rapid onset of crypt cell proliferation and increases intestinal epithelial healing, providing a protective effect against chemotherapy-induced adverse effects. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2014]

RSPO1 Gene-Disease associations (from GenCC):

• palmoplantar keratoderma-XX sex reversal-predisposition to squamous cell carcinoma syndrome

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP3: Nonframeshift variant in repetitive region in NM_001242908.2

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001242908.2. 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
	RSPO1	NM_001242908.2	MANE Select	c.750_752delGCA	p.Gln251del	disruptive_inframe_deletion	Exon 7 of 7	NP_001229837.1	Q2MKA7-1
	RSPO1	NM_001038633.4		c.750_752delGCA	p.Gln251del	disruptive_inframe_deletion	Exon 8 of 8	NP_001033722.1	Q2MKA7-1
	RSPO1	NM_001242909.2		c.669_671delGCA	p.Gln224del	disruptive_inframe_deletion	Exon 7 of 7	NP_001229838.1	Q2MKA7-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RSPO1	ENST00000356545.7	TSL:1 MANE Select	c.750_752delGCA	p.Gln251del	disruptive_inframe_deletion	Exon 7 of 7	ENSP00000348944.2	Q2MKA7-1
	RSPO1	ENST00000401068.1	TSL:1	c.750_752delGCA	p.Gln251del	disruptive_inframe_deletion	Exon 8 of 8	ENSP00000383846.1	Q2MKA7-1
	RSPO1	ENST00000612451.4	TSL:1	c.561_563delGCA	p.Gln188del	disruptive_inframe_deletion	Exon 6 of 6	ENSP00000479832.1	Q2MKA7-3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000161 AC: 4 AN: 248142 AF XY: 0.00000742

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: 0.000198

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1460376 Hom.: 0 AF XY: 0.00000551 AC XY: 4 AN XY: 726602

⚠️ 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: 33468

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.000154 AC: 8 AN: 52096

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111868

Other (OTH) AF: 0.00 AC: 0 AN: 60366

⚠️ 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
PhyloP100		2.6
Mutation Taster		=78/22	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: rs563949840; hg19: chr1-38078466; COSMIC: COSV62973576;