rs62638191

Positions:

• chr12-55724028-G-A
• chr12-55724028-G-C
• chr12-55724028-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PM5 PP3_Moderate

The NM_002905.5(RDH5):​c.712G>A​(p.Gly238Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G238A) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RDH5 NM_002905.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.97

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]

ENSG00000258311 (HGNC:):

CD63 (HGNC:1692): (CD63 molecule) The protein encoded by this gene is a member of the transmembrane 4 superfamily, also known as the tetraspanin family. Most of these members are cell-surface proteins that are characterized by the presence of four hydrophobic domains. The proteins mediate signal transduction events that play a role in the regulation of cell development, activation, growth and motility. The encoded protein is a cell surface glycoprotein that is known to complex with integrins. It may function as a blood platelet activation marker. Deficiency of this protein is associated with Hermansky-Pudlak syndrome. Also this gene has been associated with tumor progression. Alternative splicing results in multiple transcript variants encoding different protein isoforms. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a topological_domain Lumenal (size 266) in uniprot entity RDH5_HUMAN there are 57 pathogenic changes around while only 2 benign (97%) in NM_002905.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-55724029-G-C is described in Lovd as [Likely_pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.9

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RDH5	NM_002905.5	c.712G>A	p.Gly238Arg	missense_variant	4/5	ENST00000257895.10	NP_002896.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RDH5	ENST00000257895.10	c.712G>A	p.Gly238Arg	missense_variant	4/5	1	NM_002905.5	ENSP00000257895.6
ENSG00000258311	ENST00000550412.5	c.*2322G>A		3_prime_UTR_variant	4/4	2		ENSP00000447650.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.49	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.096	T;D;D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.83	T;.;T
M_CAP	Pathogenic	0.37	D
MetaRNN	Pathogenic	0.90	D;D;D
MetaSVM	Pathogenic	0.96	D
MutationAssessor	Pathogenic	3.7	.;H;H
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-7.5	D;D;D
REVEL	Pathogenic	0.85
Sift	Uncertain	0.0010	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	.;D;D
Vest4		0.90
MutPred		0.64		.;Gain of methylation at G238 (P = 0.0114);Gain of methylation at G238 (P = 0.0114);
MVP		1.0
MPC		0.65
ClinPred		1.0	D
GERP RS		4.9
Varity_R		0.86
gMVP		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs62638191; hg19: chr12-56117812;