chrX-18647296-C-A

Position:

• chrX-18647296-C-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000330.4(RS1):​c.221G>T​(p.Gly74Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000165 in 1,208,964 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: 𝑓 0.0000090 (0 hom., 0 hem., cov: 22)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: RS1 NM_000330.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 5.85

Genes affected

RS1 (HGNC:10457): (retinoschisin 1) This gene encodes an extracellular protein that plays a crucial role in the cellular organization of the retina. The encoded protein is assembled and secreted from photoreceptors and bipolar cells as a homo-oligomeric protein complex. Mutations in this gene are responsible for X-linked retinoschisis, a common, early-onset macular degeneration in males that results in a splitting of the inner layers of the retina and severe loss in vision. [provided by RefSeq, Oct 2008]

CDKL5 (HGNC:11411): (cyclin dependent kinase like 5) This gene is a member of Ser/Thr protein kinase family and encodes a phosphorylated protein with protein kinase activity. Mutations in this gene have been associated with X-linked infantile spasm syndrome (ISSX), also known as X-linked West syndrome, and Rett syndrome (RTT). Alternate transcriptional splice variants have been characterized. [provided by RefSeq, Jul 2008]

RS1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a disulfide_bond (size 156) in uniprot entity XLRS1_HUMAN there are 39 pathogenic changes around while only 0 benign (100%) in NM_000330.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant X-18647296-C-A is Pathogenic according to our data. Variant chrX-18647296-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 9890.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-18647296-C-A is described in Lovd as [Pathogenic]. Variant chrX-18647296-C-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RS1	NM_000330.4	c.221G>T	p.Gly74Val	missense_variant	4/6	ENST00000379984.4	NP_000321.1
RS1	XM_047442337.1	c.125G>T	p.Gly42Val	missense_variant	2/4		XP_047298293.1
CDKL5	NM_001037343.2	c.2797+1206C>A		intron_variant			NP_001032420.1
CDKL5	NM_003159.3	c.2797+1206C>A		intron_variant			NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RS1	ENST00000379984.4	c.221G>T	p.Gly74Val	missense_variant	4/6	1	NM_000330.4	ENSP00000369320.3
CDKL5	ENST00000379989.6	c.2797+1206C>A		intron_variant		1		ENSP00000369325.3
CDKL5	ENST00000379996.7	c.2797+1206C>A		intron_variant		1		ENSP00000369332.3
RS1	ENST00000476595.1	n.712G>T		non_coding_transcript_exon_variant	3/5	1

Frequencies

GnomAD3 genomes AF: 0.00000899 AC: 1 AN: 111244 Hom.: 0 Cov.: 22 AF XY: 0.00 AC XY: 0 AN XY: 33430

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000167

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 9.11e-7 AC: 1 AN: 1097720 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 363148

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: 0.0000247

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000899 AC: 1 AN: 111244 Hom.: 0 Cov.: 22 AF XY: 0.00 AC XY: 0 AN XY: 33430

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000167

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1 Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -
not provided, no classification provided	literature only	Retina International	-	- -

Juvenile retinoschisis Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 01, 1999

- -

Retinal dystrophy Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Jan 01, 2012

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.73
BayesDel_addAF	Pathogenic	0.70	D
BayesDel_noAF	Pathogenic	0.77
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.87	D
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.84	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.3	H
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-8.6	D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.95
MutPred		0.84		Loss of disorder (P = 0.0346);
MVP		1.0
MPC		1.8
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.93
gMVP		0.94

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: rs104894933; hg19: chrX-18665416;