X-38287173-T-C

Position:

• chrX-38287173-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001034853.2(RPGR):​c.1826A>G​(p.Asn609Ser) 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 benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 21)
• Consequence: RPGR NM_001034853.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.00100

Genes affected

RPGR (HGNC:10295): (retinitis pigmentosa GTPase regulator) This gene encodes a protein with a series of six RCC1-like domains (RLDs), characteristic of the highly conserved guanine nucleotide exchange factors. The encoded protein is found in the Golgi body and interacts with RPGRIP1. This protein localizes to the outer segment of rod photoreceptors and is essential for their viability. Mutations in this gene have been associated with X-linked retinitis pigmentosa (XLRP). Multiple alternatively spliced transcript variants that encode different isoforms of this gene have been reported, but the full-length natures of only some have been determined. [provided by RefSeq, Dec 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08301669).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RPGR	NM_001034853.2	c.1826A>G	p.Asn609Ser	missense_variant	15/15	ENST00000645032.1	NP_001030025.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RPGR	ENST00000645032.1	c.1826A>G	p.Asn609Ser	missense_variant	15/15		NM_001034853.2	ENSP00000495537	A2

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 21

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Primary ciliary dyskinesia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 11, 2022

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 609 of the RPGR protein (p.Asn609Ser). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The serine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 454513). This variant has not been reported in the literature in individuals affected with RPGR-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.51	T
BayesDel_noAF	Benign	-0.96
CADD	Benign	0.15
DANN	Benign	0.77
DEOGEN2	Benign	0.029	.;.;T;.;.;.
FATHMM_MKL	Benign	0.068	N
LIST_S2	Benign	0.49	.;T;T;T;.;T
M_CAP	Benign	0.0035	T
MetaRNN	Benign	0.083	T;T;T;T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	0.69	.;.;N;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.85	N;.;N;.;.;N
REVEL	Benign	0.016
Sift	Benign	0.086	T;.;T;.;.;.
Sift4G	Benign	0.90	T;.;T;.;.;T
Polyphen		0.40	B;B;.;.;.;.
Vest4		0.046
MutPred		0.20		Gain of phosphorylation at N609 (P = 0.0208);Gain of phosphorylation at N609 (P = 0.0208);.;.;Gain of phosphorylation at N609 (P = 0.0208);Gain of phosphorylation at N609 (P = 0.0208);
MVP		0.15
MPC		0.020
ClinPred		0.14	T
GERP RS		0.56
Varity_R		0.031
gMVP		0.011

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: rs1555961989; hg19: chrX-38146426;