X-154765465-TTTC-T
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PM4_SupportingPP5_Moderate
The NM_001363.5(DKC1):c.109_111del(p.Leu37del) variant causes a inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★).
Frequency
Genomes: not found (cov: 23)
Consequence
DKC1
NM_001363.5 inframe_deletion
NM_001363.5 inframe_deletion
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 7.27
Genes affected
DKC1 (HGNC:2890): (dyskerin pseudouridine synthase 1) This gene functions in two distinct complexes. It plays an active role in telomerase stabilization and maintenance, as well as recognition of snoRNAs containing H/ACA sequences which provides stability during biogenesis and assembly into H/ACA small nucleolar RNA ribonucleoproteins (snoRNPs). This gene is highly conserved and widely expressed, and may play additional roles in nucleo-cytoplasmic shuttling, DNA damage response, and cell adhesion. Mutations have been associated with X-linked dyskeratosis congenita. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 7 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, 6 uncertain in NM_001363.5
PM2
?
Very rare variant in population databases, with high coverage;
PM4
?
Nonframeshift variant in NON repetitive region in NM_001363.5. Strenght limited to Supporting due to length of the change: 1aa.
PP5
?
Variant X-154765465-TTTC-T is Pathogenic according to our data. Variant chrX-154765465-TTTC-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 11583.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-154765465-TTTC-T is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
DKC1 | NM_001363.5 | c.109_111del | p.Leu37del | inframe_deletion | 3/15 | ENST00000369550.10 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
DKC1 | ENST00000369550.10 | c.109_111del | p.Leu37del | inframe_deletion | 3/15 | 1 | NM_001363.5 | P2 |
Frequencies
GnomAD3 genomes ? Cov.: 23
GnomAD3 genomes
?
Cov.:
23
We have no GnomAD4 exomes data on this position. Probably position not covered by the project.
GnomAD4 genome ? Cov.: 23
GnomAD4 genome
?
Cov.:
23
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:2Other:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Dyskeratosis congenita, X-linked Pathogenic:1Other:1
Pathogenic, no assertion criteria provided | literature only | OMIM | May 01, 1998 | - - |
not provided, no classification provided | literature only | GeneReviews | - | - - |
Dyskeratosis congenita Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | May 15, 2020 | In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Experimental studies have shown that this in-frame deletion results in compromised telomere maintenance, characterized by shortened telomeres and reduced telomerase activity (PMID: 22058290, 23660516, 21602826, 25992652). This variant has been reported in individuals affected with dyskeratosis congenita (PMID: 9590285, Invitae). ClinVar contains an entry for this variant (Variation ID: 11583). This variant is not present in population databases (ExAC no frequency). This variant, c.109_111delCTT, results in the deletion of 1 amino acid of the DKC1 protein (p.Leu37del), but otherwise preserves the integrity of the reading frame. - |
Computational scores
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Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at