rs774122562

chr12-55721469-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_002905.5(RDH5):c.285G>A(p.Trp95Ter) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000343 in 1,458,464 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: RDH5 NM_002905.5 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 5.90

Genes affected

RDH5 (HGNC:9940): (retinol dehydrogenase 5) This gene encodes an enzyme belonging to the short-chain dehydrogenases/reductases (SDR) family. This retinol dehydrogenase functions to catalyze the final step in the biosynthesis of 11-cis retinaldehyde, which is the universal chromophore of visual pigments. Mutations in this gene cause autosomal recessive fundus albipunctatus, a rare form of night blindness that is characterized by a delay in the regeneration of cone and rod photopigments. Alternative splicing results in multiple transcript variants. Read-through transcription also exists between this gene and the neighboring upstream BLOC1S1 (biogenesis of lysosomal organelles complex-1, subunit 1) gene. [provided by RefSeq, Dec 2010]

BLOC1S1-RDH5 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-55721469-G-A is Pathogenic according to our data. Variant chr12-55721469-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 208608.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-55721469-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RDH5	NM_002905.5	c.285G>A	p.Trp95Ter	stop_gained	2/5	ENST00000257895.10
BLOC1S1-RDH5	NR_037658.1	n.370-220G>A		intron_variant, non_coding_transcript_variant
RDH5	NM_001199771.3	c.285G>A	p.Trp95Ter	stop_gained	2/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RDH5	ENST00000257895.10	c.285G>A	p.Trp95Ter	stop_gained	2/5	1	NM_002905.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000282 AC: 7 AN: 247944 Hom.: 0 AF XY: 0.00000744 AC XY: 1 AN XY: 134432

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000381

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000343 AC: 5 AN: 1458464 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 725778

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000126

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Aug 28, 2017	The W95X variant has been reported previously in association with fundus albipunctatus (Wang et al., 2012). This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). In summary, we consider this variant to be pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Oct 30, 2022	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 208608). This premature translational stop signal has been observed in individual(s) with fundus albipunctatus (PMID: 22669287). This variant is present in population databases (rs774122562, gnomAD 0.04%). This sequence change creates a premature translational stop signal (p.Trp95*) in the RDH5 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in RDH5 are known to be pathogenic (PMID: 11675386, 22815624). -

Pigmentary retinal dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Dec 30, 2014

The Trp95X variant in RDH5 has been reported in 1 compound heterozygous Asian individual with fundus albipunctatus (Wang 2012). This variant has also been identified in 3/8708 of East Asian chromosomes by the Exome aggregation Consortium (http://exac.broadinstitute.org). Although this variant has been seen in the general population, its frequency is low enough to be consistent with a recessive carrier frequency. This nonsense variant leads to a premature termination codon at position 95, which is predicted to lead to a truncated or absent protein. Complete loss of RDH5 function is an established disease mechanism for fundus albipunctatus (Driessen 2001, Schatz 2010, Sergouniotis 2011). In summary, this variant meets our criteria to be classified as pathogenic for fundus albipunctatus in an autosomal recessive manner based on the predicted impact to the protein. -

Fundus albipunctatus, autosomal recessive Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

-

Variant interpretted as pathogenic and reported on 12/30/2014 by GTR ID 21766. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.58
Cadd	Pathogenic	41
Dann	Uncertain	1.0
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	0.98	D
MutationTaster	Benign	1.0	A;A;D
Vest4		0.89
GERP RS		5.2

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.21		Position offset: -4

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs774122562; hg19: chr12-56115253;