17-17222500-C-A
Variant summary
Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PVS1PP5_Very_Strong
The NM_144997.7(FLCN):c.779+1G>T variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.00000743 in 1,614,078 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 Likely pathogenic (★★).
Frequency
Consequence
NM_144997.7 splice_donor, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 16 ACMG points.
Transcripts
RefSeq
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
FLCN | ENST00000285071.9 | c.779+1G>T | splice_donor_variant, intron_variant | Intron 7 of 13 | 1 | NM_144997.7 | ENSP00000285071.4 | |||
ENSG00000264187 | ENST00000427497.3 | n.149-3446G>T | intron_variant | Intron 4 of 11 | 1 | ENSP00000394249.3 |
Frequencies
GnomAD3 genomes AF: 0.0000131 AC: 2AN: 152212Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000159 AC: 4AN: 251356Hom.: 0 AF XY: 0.0000147 AC XY: 2AN XY: 135888
GnomAD4 exome AF: 0.00000684 AC: 10AN: 1461866Hom.: 0 Cov.: 31 AF XY: 0.00000825 AC XY: 6AN XY: 727230
GnomAD4 genome AF: 0.0000131 AC: 2AN: 152212Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74360
ClinVar
Submissions by phenotype
not provided Pathogenic:5
Canonical splice site variant predicted to result in a null allele in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 18234728, 21937013, 19802896, 29357828, 33726816, 23050938, 35176117) -
This variant disrupts a canonical splice-donor site and interferes with normal FLCN mRNA splicing. The frequency of this variant in the general population, 0.000039 (5/129096 chromosomes, http://gnomad.broadinstitute.org), is consistent with pathogenicity. In the published literature, the variant has been reported in individuals/families with Birt-Hogg-Dube (BHD) syndrome (PMIDs: 18234728 (2008), 21937013 (2012), 23050938 (2012), 35176117 (2022)). Based on the available information, this variant is classified as pathogenic. -
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PP1_strong, PP4, PS4_moderate, PVS1 -
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Birt-Hogg-Dube syndrome Pathogenic:4
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This sequence change affects a donor splice site in intron 7 of the FLCN gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or altered protein product. This variant is present in population databases (rs758175953, gnomAD 0.004%). Disruption of this splice site has been observed in individuals with Birt–Hogg–Dubé syndrome (PMID: 18234728, 21937013, 23050938). This variant is also known as IVS7+1 G>T. ClinVar contains an entry for this variant (Variation ID: 231274). Studies have shown that disruption of this splice site results in activation of a cryptic splice site, and produces a non-functional protein and/or introduces a premature termination codon (internal data). For these reasons, this variant has been classified as Pathogenic. -
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This variant is considered pathogenic. This variant occurs within a consensus splice junction and is predicted to result in abnormal mRNA splicing of either an out-of-frame exon or an in-frame exon necessary for protein stability and/or normal function. This variant has been reported in multiple individuals with clinical features of gene-specific disease [PMID: 35176117, 18234728, 23050938]. -
not specified Pathogenic:1
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Birt-Hogg-Dube syndrome;C0699790:Carcinoma of colon;C1868193:Familial spontaneous pneumothorax;C2931246:Potocki-Lupski syndrome;CN074294:Nonpapillary renal cell carcinoma Pathogenic:1
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Hereditary cancer-predisposing syndrome Pathogenic:1
The c.779+1G>T intronic pathogenic mutation results from a G to T substitution one nucleotide after coding exon 4 of the FLCN gene. This mutation has been reported in multiple individuals/families with Birt-Hogg-Dube syndrome (Toro JR et al. J. Med. Genet. 2008 Jun; 45(6):321-31; Ambry internal data). 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. Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at