rs121434238

Variant names:

• chr17-1650881-C-T
• rs121434238
• NM_006445.4:c.6929G>A

Variant summary

Our verdict is Pathogenic. The variant received 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_006445.4(PRPF8):​c.6929G>A​(p.Arg2310Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R2310G) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PRPF8 NM_006445.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.65
• Publications: 10 publications found

Genes affected

PRPF8 (HGNC:17340): (pre-mRNA processing factor 8) Pre-mRNA splicing occurs in 2 sequential transesterification steps. The protein encoded by this gene is a component of both U2- and U12-dependent spliceosomes, and found to be essential for the catalytic step II in pre-mRNA splicing process. It contains several WD repeats, which function in protein-protein interactions. This protein has a sequence similarity to yeast Prp8 protein. This gene is a candidate gene for autosomal dominant retinitis pigmentosa. [provided by RefSeq, Jul 2008]

PRPF8 Gene-Disease associations (from GenCC):

• inherited retinal dystrophy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• retinitis pigmentosa 13

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• neurodevelopmental disorder

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics
• retinitis pigmentosa

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

  Inheritance: AD Classification: LIMITED Submitted by: G2P

ACMG classification

Our verdict: Pathogenic. The variant received 19 ACMG points.

• PM1: In a hotspot region, there are 13 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_006445.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-1650882-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 438226.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the PRPF8 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 31 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: 8.2838 (above the threshold of 3.09). Trascript score misZ: 11.324 (above the threshold of 3.09). GenCC associations: The gene is linked to retinitis pigmentosa 13, retinitis pigmentosa, neurodevelopmental disorder, glaucoma, inherited retinal dystrophy.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.992
• PP5: Variant 17-1650881-C-T is Pathogenic according to our data. Variant chr17-1650881-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 3357.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PRPF8	NM_006445.4	c.6929G>A	p.Arg2310Lys	missense_variant	Exon 43 of 43	ENST00000304992.11	NP_006436.3
PRPF8	XM_024450537.2	c.6929G>A	p.Arg2310Lys	missense_variant	Exon 43 of 43		XP_024306305.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PRPF8	ENST00000304992.11	c.6929G>A	p.Arg2310Lys	missense_variant	Exon 43 of 43	1	NM_006445.4	ENSP00000304350.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Retinitis pigmentosa 13 Pathogenic:1

Jul 15, 2001

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided Pathogenic:1

Mar 18, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is also known as c.6970G>A. This sequence change replaces arginine, which is basic and polar, with lysine, which is basic and polar, at codon 2310 of the PRPF8 protein (p.Arg2310Lys). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant retinitis pigmentosa (PMID: 11468273, 11910553). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 3357). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). Experimental studies have shown that this missense change affects PRPF8 function (PMID: 28515276). This variant disrupts the p.Arg2310 amino acid residue in PRPF8. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 11468273, 12714658, 16799052, 28515276). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Retinal dystrophy Pathogenic:1

Dec 15, 2017

Blueprint Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D;D
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	.;D
M_CAP	Pathogenic	0.81	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.4	M;M
PhyloP100		7.7
PrimateAI	Pathogenic	0.90	D
PROVEAN	Uncertain	-2.6	D;.
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0020	D;.
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.99	D;D
Vest4		0.96
MutPred		0.93		Gain of methylation at R2310 (P = 0.0063);Gain of methylation at R2310 (P = 0.0063);
MVP		0.98
MPC		1.3
ClinPred		0.99	D
GERP RS		5.9
PromoterAI		-0.044	Neutral
Varity_R		0.99
gMVP		0.91
Mutation Taster		=4/96	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: rs121434238; hg19: chr17-1554175;