X-18642007-G-A

Variant names:

• chrX-18642007-G-A
• rs773102905
• NM_000330.4:c.672C>T

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_Strong BP6_Moderate BP7 BS2

The NM_000330.4(RS1):​c.672C>T​(p.Ala224Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000372 in 1,209,877 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 15 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.000018 (0 hom., 0 hem., cov: 23)
  • Exomes 𝑓: 0.000039 (0 hom. 15 hem.)
• Consequence: RS1 NM_000330.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.39

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

Our verdict: Benign. The variant received -11 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant X-18642007-G-A is Benign according to our data. Variant chrX-18642007-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 1161501.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=1.39 with no splicing effect.
• BS2: High Hemizygotes in GnomAdExome4 at 15 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RS1	NM_000330.4	c.672C>T	p.Ala224Ala	synonymous_variant	Exon 6 of 6	ENST00000379984.4	NP_000321.1
RS1	XM_047442337.1	c.576C>T	p.Ala192Ala	synonymous_variant	Exon 4 of 4		XP_047298293.1
CDKL5	NM_001037343.2	c.2714-4000G>A		intron_variant	Intron 19 of 21		NP_001032420.1
CDKL5	NM_003159.3	c.2714-4000G>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.672C>T	p.Ala224Ala	synonymous_variant	Exon 6 of 6	1	NM_000330.4	ENSP00000369320.3
CDKL5	ENST00000379989.6	c.2714-4000G>A		intron_variant	Intron 19 of 21	1		ENSP00000369325.3
CDKL5	ENST00000379996.7	c.2714-4000G>A		intron_variant	Intron 18 of 20	1		ENSP00000369332.3
RS1	ENST00000476595.1	n.1163C>T		non_coding_transcript_exon_variant	Exon 5 of 5	1

Frequencies

GnomAD3 genomes AF: 0.0000178 AC: 2 AN: 112250 Hom.: 0 Cov.: 23

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000282

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000188

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000548 AC: 10 AN: 182570 AF XY: 0.0000891

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000365

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000723

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000983

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000392 AC: 43 AN: 1097577 Hom.: 0 Cov.: 31 AF XY: 0.0000413 AC XY: 15 AN XY: 363207

Gnomad4 AFR exome AF: 0.00 AC: 0 AN: 26385

Gnomad4 AMR exome AF: 0.0000284 AC: 1 AN: 35206

Gnomad4 ASJ exome AF: 0.00 AC: 0 AN: 19381

Gnomad4 EAS exome AF: 0.00 AC: 0 AN: 30206

Gnomad4 SAS exome AF: 0.00 AC: 0 AN: 54117

Gnomad4 FIN exome AF: 0.00 AC: 0 AN: 40456

Gnomad4 NFE exome AF: 0.0000451 AC: 38 AN: 842084

Gnomad4 Remaining exome AF: 0.0000869 AC: 4 AN: 46038

GnomAD4 genome AF: 0.0000178 AC: 2 AN: 112300 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 34480

Gnomad4 AFR AF: 0.00 AC: 0 AN: 0

Gnomad4 AMR AF: 0.00 AC: 0 AN: 0

Gnomad4 ASJ AF: 0.00 AC: 0 AN: 0

Gnomad4 EAS AF: 0.000283 AC: 0.000282566 AN: 0.000282566

Gnomad4 SAS AF: 0.00 AC: 0 AN: 0

Gnomad4 FIN AF: 0.00 AC: 0 AN: 0

Gnomad4 NFE AF: 0.0000188 AC: 0.0000187917 AN: 0.0000187917

Gnomad4 OTH AF: 0.00 AC: 0 AN: 0

Alfa AF: 0.0000868 Hom.: 1

Bravo AF: 0.0000113

EpiCase AF: 0.0000545

EpiControl AF: 0.000237

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jan 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	10
DANN	Benign	0.84
Mutation Taster		=100/0	polymorphism

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: rs773102905; hg19: chrX-18660127;