rs1554391489
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Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000492.4(CFTR):c.2982_2988+2delCATCCAGGT(p.Ile995fs) variant causes a frameshift, splice donor, splice region, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000714 in 1,399,860 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 7.1e-7 ( 0 hom. )
Consequence
CFTR
NM_000492.4 frameshift, splice_donor, splice_region, intron
NM_000492.4 frameshift, splice_donor, splice_region, intron
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 9.25
Genes affected
CFTR (HGNC:1884): (CF transmembrane conductance regulator) This gene encodes a member of the ATP-binding cassette (ABC) transporter superfamily. The encoded protein functions as a chloride channel, making it unique among members of this protein family, and controls ion and water secretion and absorption in epithelial tissues. Channel activation is mediated by cycles of regulatory domain phosphorylation, ATP-binding by the nucleotide-binding domains, and ATP hydrolysis. Mutations in this gene cause cystic fibrosis, the most common lethal genetic disorder in populations of Northern European descent. The most frequently occurring mutation in cystic fibrosis, DeltaF508, results in impaired folding and trafficking of the encoded protein. Multiple pseudogenes have been identified in the human genome. [provided by RefSeq, Aug 2017]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
Very rare variant in population databases, with high coverage;
PP5
Variant 7-117606745-TTCATCCAGG-T is Pathogenic according to our data. Variant chr7-117606745-TTCATCCAGG-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 439070.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
CFTR | NM_000492.4 | c.2982_2988+2delCATCCAGGT | p.Ile995fs | frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant | 18/27 | ENST00000003084.11 | NP_000483.3 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
CFTR | ENST00000003084.11 | c.2982_2988+2delCATCCAGGT | p.Ile995fs | frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant | 18/27 | 1 | NM_000492.4 | ENSP00000003084.6 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 7.14e-7 AC: 1AN: 1399860Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 700394
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GnomAD4 genome Cov.: 32
GnomAD4 genome
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32
ClinVar
Significance: Likely pathogenic
Submissions summary: Pathogenic:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Cystic fibrosis Pathogenic:2
Likely pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jun 07, 2023 | Variant summary: CFTR c.2982_2988+2delCATCCAGGT is located in a canonical splice-site and is predicted to affect mRNA splicing resulting in a significantly altered protein due to either exon skipping, shortening, or inclusion of intronic material. Several computational tools predict a significant impact on normal splicing: Three predict the variant abolishes a 5' splicing donor site. Four predict the variant abolishes a 3' acceptor site. However, these predictions have yet to be confirmed by functional studies. The variant was absent in 251096 control chromosomes. c.2982_2988+2delCATCCAGGT has been reported in the literature in individuals affected with Cystic Fibrosis (Schrijver_2016). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 26708955). One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. One laboratory classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 02, 2024 | This variant results in the deletion of part of exon 18 (c.2982_2988+2del) of the CFTR gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in CFTR are known to be pathogenic (PMID: 1695717, 7691345, 9725922). This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with cystic fibrosis (PMID: 26708955). ClinVar contains an entry for this variant (Variation ID: 439070). 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. - |
not provided Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Jul 06, 2017 | - - |
Computational scores
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Find out detailed SpliceAI scores and Pangolin per-transcript scores at