15-89210338-C-A

Variant names:

• chr15-89210338-C-A
• rs773667486
• NM_000326.5:c.901G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000326.5(RLBP1):​c.901G>T​(p.Val301Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000304 in 1,614,112 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000039 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000029 (0 hom.)
• Consequence: RLBP1 NM_000326.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.04

Genes affected

RLBP1 (HGNC:10024): (retinaldehyde binding protein 1) The protein encoded by this gene is a 36-kD water-soluble protein which carries 11-cis-retinaldehyde or 11-cis-retinal as physiologic ligands. It may be a functional component of the visual cycle. Mutations of this gene have been associated with severe rod-cone dystrophy, Bothnia dystrophy (nonsyndromic autosomal recessive retinitis pigmentosa) and retinitis punctata albescens. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.21515921).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RLBP1	NM_000326.5	c.901G>T	p.Val301Phe	missense_variant	Exon 9 of 9	ENST00000268125.10	NP_000317.1
RLBP1	XM_011521870.3	c.901G>T	p.Val301Phe	missense_variant	Exon 9 of 9		XP_011520172.1
RLBP1	XM_047432927.1	c.901G>T	p.Val301Phe	missense_variant	Exon 7 of 7		XP_047288883.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RLBP1	ENST00000268125.10	c.901G>T	p.Val301Phe	missense_variant	Exon 9 of 9	1	NM_000326.5	ENSP00000268125.5
RLBP1	ENST00000563254.1	c.271G>T	p.Val91Phe	missense_variant	Exon 3 of 3	2		ENSP00000454740.1

Frequencies

GnomAD3 genomes AF: 0.0000394 AC: 6 AN: 152238 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251350 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000294 AC: 43 AN: 1461874 Hom.: 0 Cov.: 32 AF XY: 0.0000371 AC XY: 27 AN XY: 727238

Gnomad4 AFR exome AF: 0.00 AC: 0 AN: 33480

Gnomad4 AMR exome AF: 0.00 AC: 0 AN: 44724

Gnomad4 ASJ exome AF: 0.00 AC: 0 AN: 26136

Gnomad4 EAS exome AF: 0.00 AC: 0 AN: 39700

Gnomad4 SAS exome AF: 0.00 AC: 0 AN: 86258

Gnomad4 FIN exome AF: 0.00 AC: 0 AN: 53408

Gnomad4 NFE exome AF: 0.0000360 AC: 40 AN: 1112006

Gnomad4 Remaining exome AF: 0.0000497 AC: 3 AN: 60396

GnomAD4 genome AF: 0.0000394 AC: 6 AN: 152238 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74366

Gnomad4 AFR AF: 0.0000241 AC: 0.000024115 AN: 0.000024115

Gnomad4 AMR AF: 0.0000654 AC: 0.0000654279 AN: 0.0000654279

Gnomad4 ASJ AF: 0.00 AC: 0 AN: 0

Gnomad4 EAS AF: 0.00 AC: 0 AN: 0

Gnomad4 SAS AF: 0.00 AC: 0 AN: 0

Gnomad4 FIN AF: 0.00 AC: 0 AN: 0

Gnomad4 NFE AF: 0.0000588 AC: 0.0000587786 AN: 0.0000587786

Gnomad4 OTH AF: 0.00 AC: 0 AN: 0

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.000109

EpiControl AF: 0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Jan 04, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.901G>T (p.V301F) alteration is located in exon 9 (coding exon 7) of the RLBP1 gene. This alteration results from a G to T substitution at nucleotide position 901, causing the valine (V) at amino acid position 301 to be replaced by a phenylalanine (F). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided Uncertain:1

Mar 12, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 301 of the RLBP1 protein (p.Val301Phe). This variant is present in population databases (rs773667486, gnomAD 0.004%). This variant has not been reported in the literature in individuals affected with RLBP1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1046288). 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. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.085	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	9.5
DANN	Uncertain	0.98
DEOGEN2	Benign	0.29	T
Eigen	Benign	-0.52
Eigen_PC	Benign	-0.56
FATHMM_MKL	Benign	0.48	N
LIST_S2	Uncertain	0.88	D
M_CAP	Benign	0.075	D
MetaRNN	Benign	0.22	T
MetaSVM	Benign	-0.76	T
MutationAssessor	Benign	0.13	N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	2.3	N
REVEL	Uncertain	0.30
Sift	Benign	0.092	T
Sift4G	Benign	0.13	T
Polyphen		0.81	P
Vest4		0.20
MutPred		0.60		Loss of helix (P = 0.079);
MVP		0.62
MPC		0.49
ClinPred		0.23	T
GERP RS		4.2
Varity_R		0.089
gMVP		0.79
Mutation Taster		=71/29	polymorphism

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: rs773667486; hg19: chr15-89753569;