NM_000330.4:c.668G>T

Variant names:

• chrX-18642011-C-A
• NM_000330.4:c.668G>T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_000330.4(RS1):​c.668G>T​(p.Cys223Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000911 in 1,097,574 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: RS1 NM_000330.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.57

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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a disulfide_bond Interchain (with C-59) (size 0) in uniprot entity XLRS1_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.956

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RS1	NM_000330.4	c.668G>T	p.Cys223Phe	missense_variant	Exon 6 of 6	ENST00000379984.4	NP_000321.1
RS1	XM_047442337.1	c.572G>T	p.Cys191Phe	missense_variant	Exon 4 of 4		XP_047298293.1
CDKL5	NM_001037343.2	c.2714-3996C>A		intron_variant	Intron 19 of 21		NP_001032420.1
CDKL5	NM_003159.3	c.2714-3996C>A		intron_variant	Intron 18 of 20		NP_003150.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RS1	ENST00000379984.4	c.668G>T	p.Cys223Phe	missense_variant	Exon 6 of 6	1	NM_000330.4	ENSP00000369320.3
CDKL5	ENST00000379989.6	c.2714-3996C>A		intron_variant	Intron 19 of 21	1		ENSP00000369325.3
CDKL5	ENST00000379996.7	c.2714-3996C>A		intron_variant	Intron 18 of 20	1		ENSP00000369332.3
RS1	ENST00000476595.1	n.1159G>T		non_coding_transcript_exon_variant	Exon 5 of 5	1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 9.11e-7 AC: 1 AN: 1097574 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 363164

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: 0.00

Gnomad4 NFE exome AF: 0.00000119

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Pathogenic	0.65	D
BayesDel_noAF	Pathogenic	0.69
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.74	D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.49	T
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.0	M
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-3.2	D
REVEL	Pathogenic	0.93
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.80
MutPred		0.73		Gain of sheet (P = 0.1208);
MVP		0.96
MPC		1.8
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.89
gMVP		1.0

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-18660131;