X-18642013-C-G

Position:

• chrX-18642013-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The ENST00000379984.4(RS1):​c.666G>C​(p.Lys222Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as not provided (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in UniProt. Synonymous variant affecting the same amino acid position (i.e. K222K) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 23)
• Consequence: RS1 ENST00000379984.4 missense
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 1.09

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in ENST00000379984.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RS1	NM_000330.4	c.666G>C	p.Lys222Asn	missense_variant	6/6	ENST00000379984.4	NP_000321.1
RS1	XM_047442337.1	c.570G>C	p.Lys190Asn	missense_variant	4/4		XP_047298293.1
CDKL5	NM_001037343.2	c.2714-3994C>G		intron_variant			NP_001032420.1
CDKL5	NM_003159.3	c.2714-3994C>G		intron_variant			NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RS1	ENST00000379984.4	c.666G>C	p.Lys222Asn	missense_variant	6/6	1	NM_000330.4	ENSP00000369320.3
CDKL5	ENST00000379989.6	c.2714-3994C>G		intron_variant		1		ENSP00000369325.3
CDKL5	ENST00000379996.7	c.2714-3994C>G		intron_variant		1		ENSP00000369332.3
RS1	ENST00000476595.1	n.1157G>C		non_coding_transcript_exon_variant	5/5	1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 23

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

not provided Other:1

not provided, no classification provided

literature only

Retina International

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.20	T
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.76	T
M_CAP	Pathogenic	0.91	D
MetaRNN	Uncertain	0.69	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Benign	0.80	N
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.57
Sift	Uncertain	0.0080	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.59
MutPred		0.13		Loss of methylation at K222 (P = 2e-04);
MVP		0.73
MPC		1.7
ClinPred		0.90	D
GERP RS		3.6
Varity_R		0.56
gMVP		0.96

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: rs1800004; hg19: chrX-18660133;