chr17-1650898-G-C

Position:

• chr17-1650898-G-C

Variant summary

Our verdict is Pathogenic. Variant got 23 ACMG points: 23P and 0B. PS1 PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_006445.4(PRPF8):​c.6912C>G​(p.Phe2304Leu) variant causes a missense change involving the alteration of a non-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 Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F2304V) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PRPF8 NM_006445.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 1.95

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]

ACMG classification

Verdict is Pathogenic. Variant got 23 ACMG points.

• PS1: Transcript NM_006445.4 (PRPF8) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 2089649
• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 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 chr17-1650900-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 866145.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Uncertain_significance=2}.
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PRPF8. . Gene score misZ 8.2838 (greater than the threshold 3.09). Trascript score misZ 11.324 (greater than threshold 3.09). GenCC has associacion of gene with neurodevelopmental disorder, retinitis pigmentosa 13, inherited retinal dystrophy, retinitis pigmentosa.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.993
• PP5: Variant 17-1650898-G-C is Pathogenic according to our data. Variant chr17-1650898-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3359.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-1650898-G-C is described in UniProt as null. Variant chr17-1650898-G-C is described in UniProt as null. Variant chr17-1650898-G-C is described in Lovd as [Pathogenic]. Variant chr17-1650898-G-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRPF8	NM_006445.4	c.6912C>G	p.Phe2304Leu	missense_variant	43/43	ENST00000304992.11
PRPF8	XM_024450537.2	c.6912C>G	p.Phe2304Leu	missense_variant	43/43

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRPF8	ENST00000304992.11	c.6912C>G	p.Phe2304Leu	missense_variant	43/43	1	NM_006445.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 13, 2023	This sequence change replaces phenylalanine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 2304 of the PRPF8 protein (p.Phe2304Leu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with retinitis pigmentosa (PMID: 11468273, 16799052, 24938718, 28076437). This variant is also known as c.6953C>G. ClinVar contains an entry for this variant (Variation ID: 3359). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt PRPF8 protein function with a positive predictive value of 80%. This variant disrupts the p.Phe2304 amino acid residue in PRPF8. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 33576794; Invitae). 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. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

Retinitis pigmentosa 13 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jul 15, 2001

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.53
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D;D
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	0.99	.;D
M_CAP	Pathogenic	0.77	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M;M
MutationTaster	Benign	1.0	A;A
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.0	D;.
REVEL	Pathogenic	0.87
Sift	Uncertain	0.0010	D;.
Sift4G	Uncertain	0.0020	D;D
Polyphen		0.66	P;P
Vest4		0.97
MutPred		0.97		Loss of methylation at K2302 (P = 0.1091);Loss of methylation at K2302 (P = 0.1091);
MVP		0.99
MPC		1.2
ClinPred		0.99	D
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.99
gMVP		0.81

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

Publications

LitVar

Other links and lift over

dbSNP: rs121434240; hg19: chr17-1554192;