9-32552432-A-C

Variant names:

• chr9-32552432-A-C
• rs969010725
• NM_001387564.1:c.-3A>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_005802.5(TOPORS):​c.3+2T>G variant causes a splice donor, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,456,996 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TOPORS NM_005802.5 splice_donor, intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.87
• Publications: 0 publications found

Genes affected

SMIM27 (HGNC:31420): (small integral membrane protein 27) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

TOPORS (HGNC:21653): (TOP1 binding arginine/serine rich protein, E3 ubiquitin ligase) This gene encodes a nuclear protein which is serine and arginine rich, and contains a RING-type zinc finger domain. It is highly expressed in the testis, and functions as an ubiquitin-protein E3 ligase. Mutations in this gene are associated with retinitis pigmentosa type 31. Alternatively spliced transcript variants, encoding different isoforms, have been observed for this locus. [provided by RefSeq, Sep 2010]

TOPORS Gene-Disease associations (from GenCC):

• retinitis pigmentosa 31

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• TOPORS-related retinopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ciliopathy

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

ENSG00000288684 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.04875717 fraction of the gene.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005802.5. 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
	SMIM27	NM_001387564.1	MANE Select	c.-3A>C		5_prime_UTR	Exon 1 of 2	NP_001374493.1	A0A1B0GUW7
	TOPORS	NM_005802.5	MANE Select	c.3+2T>G		splice_donor intron	N/A	NP_005793.2
	SMIM27	NM_001349118.1		c.-3A>C		5_prime_UTR	Exon 2 of 3	NP_001336047.1	A0A1B0GUW7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMIM27	ENST00000692500.1	MANE Select	c.-3A>C		5_prime_UTR	Exon 1 of 2	ENSP00000508648.1	A0A1B0GUW7
	TOPORS	ENST00000360538.7	TSL:1 MANE Select	c.3+2T>G		splice_donor intron	N/A	ENSP00000353735.2	Q9NS56-1
	TOPORS	ENST00000379858.1	TSL:1	c.3+2T>G		splice_donor intron	N/A	ENSP00000369187.1	Q9NS56-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1456996 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 724274

African (AFR) AF: 0.00 AC: 0 AN: 33426

American (AMR) AF: 0.00 AC: 0 AN: 44248

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26038

East Asian (EAS) AF: 0.00 AC: 0 AN: 39562

South Asian (SAS) AF: 0.00 AC: 0 AN: 85282

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52536

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5512

European-Non Finnish (NFE) AF: 9.01e-7 AC: 1 AN: 1110256

Other (OTH) AF: 0.00 AC: 0 AN: 60136

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.21
CADD	Pathogenic	32
DANN	Uncertain	0.99
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Benign	0.30	N
PhyloP100		2.9
GERP RS		5.0
PromoterAI		-0.37	Neutral
Mutation Taster		=17/83	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.24		Position offset: -50
DS_DL_spliceai		1.0		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs969010725; hg19: chr9-32552430;