NM_005802.5:c.2666A>C

Variant names:

• chr9-32541859-T-G
• rs762457246
• NM_005802.5:c.2666A>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005802.5(TOPORS):​c.2666A>C​(p.His889Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,818 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H889R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: TOPORS NM_005802.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.38
• Publications: 0 publications found

Genes affected

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36346143).

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
	TOPORS	NM_005802.5	MANE Select	c.2666A>C	p.His889Pro	missense	Exon 3 of 3	NP_005793.2
	TOPORS	NM_001195622.2		c.2471A>C	p.His824Pro	missense	Exon 2 of 2	NP_001182551.1	Q9NS56-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TOPORS	ENST00000360538.7	TSL:1 MANE Select	c.2666A>C	p.His889Pro	missense	Exon 3 of 3	ENSP00000353735.2	Q9NS56-1
	TOPORS	ENST00000379858.1	TSL:1	c.2471A>C	p.His824Pro	missense	Exon 2 of 2	ENSP00000369187.1	Q9NS56-2
	ENSG00000288684	ENST00000681750.1		c.-45+8915A>C		intron	N/A	ENSP00000506413.1	A0A7P0TB70

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461818 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727206

⚠️ 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: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86252

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53386

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111992

Other (OTH) AF: 0.00 AC: 0 AN: 60392

⚠️ 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.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Benign	-0.050	T
BayesDel_noAF	Benign	-0.31
CADD	Uncertain	26
DANN	Uncertain	0.97
DEOGEN2	Benign	0.061	T
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
PhyloP100		7.4
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.18
Sift	Uncertain	0.0080	D
Sift4G	Benign	0.061	T
Polyphen		1.0	D
Vest4		0.54
MutPred		0.16		Gain of glycosylation at H889 (P = 0.0012)
MVP		0.24
MPC		0.49
ClinPred		0.86	D
GERP RS		5.0
Varity_R		0.26
gMVP		0.28
Mutation Taster		=21/79	disease causing

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: rs762457246; hg19: chr9-32541857;