X-18641857-TAAA-TAAAAA

Variant names:

• chrX-18641857-T-TAA
• rs377648180
• NM_000330.4:c.*145_*146dupTT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_000330.4(RS1):​c.*145_*146dupTT variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 20)
  • Exomes 𝑓: 0.000098 (0 hom. 0 hem.)
• Consequence: RS1 NM_000330.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.54
• Publications: 0 publications found

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]

CDKL5 Gene-Disease associations (from GenCC):

• CDKL5 disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• developmental and epileptic encephalopathy, 2

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• atypical Rett syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• precocious puberty

  Inheritance: XL Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000330.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RS1	NM_000330.4	MANE Select	c.*145_*146dupTT		3_prime_UTR	Exon 6 of 6	NP_000321.1	O15537
	CDKL5	NM_001037343.2		c.2714-4138_2714-4137dupAA		intron	N/A	NP_001032420.1	O76039-1
	CDKL5	NM_003159.3		c.2714-4138_2714-4137dupAA		intron	N/A	NP_003150.1	O76039-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RS1	ENST00000379984.4	TSL:1 MANE Select	c.*145_*146dupTT		3_prime_UTR	Exon 6 of 6	ENSP00000369320.3	O15537
	CDKL5	ENST00000379989.6	TSL:1	c.2714-4138_2714-4137dupAA		intron	N/A	ENSP00000369325.3	O76039-1
	CDKL5	ENST00000379996.7	TSL:1	c.2714-4138_2714-4137dupAA		intron	N/A	ENSP00000369332.3	O76039-1

Frequencies

GnomAD3 genomes Cov.: 20

GnomAD4 exome AF: 0.0000983 AC: 34 AN: 346032 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 107164

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 9433

American (AMR) AF: 0.0000737 AC: 1 AN: 13573

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 9554

East Asian (EAS) AF: 0.00 AC: 0 AN: 17782

South Asian (SAS) AF: 0.0000406 AC: 1 AN: 24644

European-Finnish (FIN) AF: 0.0000555 AC: 1 AN: 18017

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1220

European-Non Finnish (NFE) AF: 0.000124 AC: 29 AN: 233572

Other (OTH) AF: 0.000110 AC: 2 AN: 18237

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 20

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-1.5

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs377648180; hg19: chrX-18659977;