8-107989213-AC-A

Variant names:

• chr8-107989213-AC-A
• rs1554579568
• NM_178565.5:c.125delG

Variant summary

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

The NM_178565.5(RSPO2):​c.125delG​(p.Gly42ValfsTer49) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000698 in 1,432,422 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: RSPO2 NM_178565.5 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 7.48
• Publications: 0 publications found

Genes affected

RSPO2 (HGNC:28583): (R-spondin 2) This gene encodes a member of the R-spondin family of proteins. These proteins are secreted ligands of leucine-rich repeat containing G protein-coupled receptors that enhance Wnt signaling through the inhibition of ubiquitin E3 ligases. A chromosomal translocation including this locus that results in the formation of a gene fusion has been identified in multiple human cancers. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2015]

RSPO2 Gene-Disease associations (from GenCC):

• tetraamelia syndrome 2

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• tetraamelia-multiple malformations syndrome

  Inheritance: AR 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 8-107989213-AC-A is Pathogenic according to our data. Variant chr8-107989213-AC-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 545632.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_178565.5. 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
	RSPO2	NM_178565.5	MANE Select	c.125delG	p.Gly42ValfsTer49	frameshift	Exon 3 of 6	NP_848660.3
	RSPO2	NM_001317942.2		c.-77delG		5_prime_UTR	Exon 2 of 5	NP_001304871.1
	RSPO2	NM_001282863.2		c.95-28397delG		intron	N/A	NP_001269792.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RSPO2	ENST00000276659.10	TSL:1 MANE Select	c.125delG	p.Gly42ValfsTer49	frameshift	Exon 3 of 6	ENSP00000276659.5
	RSPO2	ENST00000517939.5	TSL:1	c.-77delG		5_prime_UTR	Exon 2 of 5	ENSP00000428940.1
	RSPO2	ENST00000517781.5	TSL:1	c.95-28397delG		intron	N/A	ENSP00000427937.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.98e-7 AC: 1 AN: 1432422 Hom.: 0 Cov.: 30 AF XY: 0.00000140 AC XY: 1 AN XY: 711854

African (AFR) AF: 0.00 AC: 0 AN: 31584

American (AMR) AF: 0.00 AC: 0 AN: 35970

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25054

East Asian (EAS) AF: 0.00 AC: 0 AN: 38754

South Asian (SAS) AF: 0.0000125 AC: 1 AN: 79822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53216

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5664

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1103056

Other (OTH) AF: 0.00 AC: 0 AN: 59302

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Tetraamelia syndrome 2 Pathogenic:2

Kasturba Medical College, Manipal, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Jun 22, 2018

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.5
Mutation Taster		=16/184	disease causing (ClinVar)

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: rs1554579568; hg19: chr8-109001441;