chr14-21287984-A-G

Position:

• chr14-21287984-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_020366.4(RPGRIP1):​c.8A>G​(p.His3Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000011 in 1,459,446 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: RPGRIP1 NM_020366.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.184

Genes affected

RPGRIP1 (HGNC:13436): (RPGR interacting protein 1) This gene encodes a photoreceptor protein that interacts with retinitis pigmentosa GTPase regulator protein and is a key component of cone and rod photoreceptor cells. Mutations in this gene lead to autosomal recessive congenital blindness. [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.064881384).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RPGRIP1	NM_020366.4	c.8A>G	p.His3Arg	missense_variant	2/25	ENST00000400017.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RPGRIP1	ENST00000400017.7	c.8A>G	p.His3Arg	missense_variant	2/25	1	NM_020366.4	P2
RPGRIP1	ENST00000557771.5	c.8A>G	p.His3Arg	missense_variant	1/24	5		A2
RPGRIP1	ENST00000556336.5	c.8A>G	p.His3Arg	missense_variant	1/21	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000110 AC: 16 AN: 1459446 Hom.: 0 Cov.: 29 AF XY: 0.00000826 AC XY: 6 AN XY: 726166

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000144

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leber congenital amaurosis 6;C2750720:Cone-rod dystrophy 13 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 30, 2020

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 missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with RPGRIP1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces histidine with arginine at codon 3 of the RPGRIP1 protein (p.His3Arg). The histidine residue is weakly conserved and there is a small physicochemical difference between histidine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.080
BayesDel_addAF	Benign	-0.24	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	3.6
DANN	Benign	0.78
DEOGEN2	Benign	0.025	T;T;T
Eigen	Benign	-0.91
Eigen_PC	Benign	-0.94
FATHMM_MKL	Benign	0.034	N
LIST_S2	Benign	0.43	T;T;T
M_CAP	Benign	0.0028	T
MetaRNN	Benign	0.065	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	.;.;L
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.7	N;N;N
REVEL	Benign	0.029
Sift	Benign	0.21	T;T;T
Sift4G	Uncertain	0.039	D;D;D
Polyphen		0.0040	.;.;B
Vest4		0.092
MutPred		0.15		Gain of phosphorylation at S2 (P = 0.0632);Gain of phosphorylation at S2 (P = 0.0632);Gain of phosphorylation at S2 (P = 0.0632);
MVP		0.34
MPC		0.092
ClinPred		0.045	T
GERP RS		0.19
Varity_R		0.041
gMVP		0.054

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr14-21756143;