17-17222500-C-G
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_144997.7(FLCN):c.779+1G>C variant causes a splice donor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).
Frequency
Consequence
NM_144997.7 splice_donor, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 18 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
FLCN | ENST00000285071.9 | c.779+1G>C | splice_donor_variant, intron_variant | Intron 7 of 13 | 1 | NM_144997.7 | ENSP00000285071.4 | |||
ENSG00000264187 | ENST00000427497.3 | n.149-3446G>C | intron_variant | Intron 4 of 11 | 1 | ENSP00000394249.3 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD4 exome Cov.: 31
GnomAD4 genome Cov.: 32
ClinVar
Submissions by phenotype
Hereditary cancer-predisposing syndrome Pathogenic:1
The c.779+1G>C intronic pathogenic mutation results from a G to C substitution one nucleotide after coding exon 4 of the FLCN gene. A different substitution affecting the same nucleotide position, c.779+1G>T, has been reported in multiple families with Birt-Hogg-Dube syndrome (Toro JR et al. J. Med. Genet. 2008 Jun; 45(6):321-31). The c.779+1G>C variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). In silico splice site analysis predicts that this alteration will weaken the native splice donor site and will result in the creation or strengthening of a novel splice donor site. Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as a disease-causing mutation. -
Birt-Hogg-Dube syndrome Pathogenic:1
This sequence change affects a donor splice site in intron 7 of the FLCN 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 FLCN are known to be pathogenic (PMID: 15852235). This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individuals with Birt-Hogg-Dubé syndrome (PMID: 18234728). ClinVar contains an entry for this variant (Variation ID: 428652). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at