7-117542025-C-CA
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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.1130dup(p.Gln378AlafsTer4) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000726 in 1,377,982 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 7.3e-7 ( 0 hom. )
Consequence
CFTR
NM_000492.4 frameshift
NM_000492.4 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 3.07
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 7-117542025-C-CA is Pathogenic according to our data. Variant chr7-117542025-C-CA is described in ClinVar as [Pathogenic]. Clinvar id is 487392.Status of the report is reviewed_by_expert_panel, 3 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CFTR | NM_000492.4 | c.1130dup | p.Gln378AlafsTer4 | frameshift_variant | 9/27 | ENST00000003084.11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CFTR | ENST00000003084.11 | c.1130dup | p.Gln378AlafsTer4 | frameshift_variant | 9/27 | 1 | NM_000492.4 | P2 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
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32
GnomAD4 exome AF: 7.26e-7 AC: 1AN: 1377982Hom.: 0 Cov.: 23 AF XY: 0.00000145 AC XY: 1AN XY: 690710
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GnomAD4 genome Cov.: 32
GnomAD4 genome
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32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:8
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
Cystic fibrosis Pathogenic:6
Pathogenic, criteria provided, single submitter | curation | CFTR-France | Jul 21, 2015 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Oct 08, 2020 | The c.1130dupA (also known as c.1127_1128insA and legacy c.1259insA) pathogenic mutation, located in coding exon 9 of the CFTR gene, results from a duplication of A at nucleotide position 1130, causing a translational frameshift with a predicted alternate stop codon (p.Q378Afs*4). This mutation was originally reported in an individual with pancreatic insufficient cystic fibrosis with a second CFTR mutation (c.1585-1G>A, legacy c.1717-1G>A) detected in trans (Shrimpton AE et al. Hum Mutat., 1997;10:436-42). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
Pathogenic, criteria provided, single submitter | curation | Laboratory of Medical Genetics, National & Kapodistrian University of Athens | Feb 01, 2024 | - - |
Pathogenic, reviewed by expert panel | research | CFTR2 | Mar 17, 2017 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 14, 2022 | Variant summary: CFTR c.1130dupA (p.Gln378AlafsX4) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 250100 control chromosomes (gnomAD). c.1130dupA (aka. 1259insA or c.1127_1128insA) has been reported in the literature in multiple individuals affected with Cystic Fibrosis (e.g. Shrimpton_1997, McGinniss_2005, Sosnay_2013). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three submitters have provided clinical-significance assessments for this variant in ClinVar after 2014, and classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Apr 04, 2019 | This variant has been observed in individuals with cystic fibrosis (PMID: 9401006, 23974870, 26911355). In at least one individual the data is consistent with the variant being in trans (on the opposite chromosome) from a pathogenic variant. This variant is also known as 1259insA and c.1127_1128insA in the literature. ClinVar contains an entry for this variant (Variation ID: 53197). For these reasons, this variant has been classified as Pathogenic. Loss-of-function variants in CFTR are known to be pathogenic (PMID: 1695717, 7691345, 9725922). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln378Alafs*4) in the CFTR gene. It is expected to result in an absent or disrupted protein product. - |
CFTR-related disorder Pathogenic:1
Pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Mar 17, 2017 | - - |
Bronchiectasis with or without elevated sweat chloride 1 Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Mar 20, 2024 | - - |
Computational scores
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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