chr17-31221930-G-C
Position:
Variant summary
Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PVS1PM2PP3_ModeratePP5_Very_Strong
The NM_001042492.3(NF1):c.1721+1G>C variant causes a splice donor change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).
Frequency
Genomes: not found (cov: 32)
Consequence
NF1
NM_001042492.3 splice_donor
NM_001042492.3 splice_donor
Scores
4
2
2
Clinical Significance
Conservation
PhyloP100: 9.28
Genes affected
NF1 (HGNC:7765): (neurofibromin 1) This gene product appears to function as a negative regulator of the ras signal transduction pathway. Mutations in this gene have been linked to neurofibromatosis type 1, juvenile myelomonocytic leukemia and Watson syndrome. The mRNA for this gene is subject to RNA editing (CGA>UGA->Arg1306Term) resulting in premature translation termination. Alternatively spliced transcript variants encoding different isoforms have also been described for this gene. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 20 ACMG points.
PVS1
Splicing variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
Very rare variant in population databases, with high coverage;
PP3
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
PP5
Variant 17-31221930-G-C is Pathogenic according to our data. Variant chr17-31221930-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 586169.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-31221930-G-C is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
NF1 | NM_001042492.3 | c.1721+1G>C | splice_donor_variant | ENST00000358273.9 | |||
NF1 | NM_000267.3 | c.1721+1G>C | splice_donor_variant | ||||
NF1 | NM_001128147.3 | c.1722G>C | p.Arg574Ser | missense_variant | 15/15 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
NF1 | ENST00000358273.9 | c.1721+1G>C | splice_donor_variant | 1 | NM_001042492.3 | P1 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome Cov.: 29
GnomAD4 exome
Cov.:
29
GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Neurofibromatosis, type 1 Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Mar 15, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jul 06, 2021 | This variant is not present in population databases (ExAC no frequency). For these reasons, this variant has been classified as Pathogenic. Studies have shown that this variant is associated with skipping of exon 15 (also known as exon 11 in the literature), which introduces a premature termination codon (PMID: 23913538). The resulting mRNA is expected to undergo nonsense-mediated decay. Disruption of this splice site has been observed in individual(s) with neurofibromatosis type 1 (PMID: 12552569, 23913538, 18546366). ClinVar contains an entry for this variant (Variation ID: 586169). This sequence change affects a donor splice site in intron 15 of the NF1 gene. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Athena Diagnostics | Apr 09, 2018 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Apr 06, 2023 | 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: 18546366, 12552569, 23913538) - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Benign
CADD
Pathogenic
DANN
Uncertain
Eigen
Uncertain
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
M_CAP
Pathogenic
D
MutationTaster
Benign
D;D;N
ClinPred
D
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DL_spliceai
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Find out detailed SpliceAI scores and Pangolin per-transcript scores at