17-31227227-C-G
Position:
Variant summary
Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP2BP4BS2_Supporting
The NM_001042492.3(NF1):āc.2261C>Gā(p.Ala754Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000116 in 1,461,386 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (ā ā ).
Frequency
Genomes: not found (cov: 32)
Exomes š: 0.000012 ( 0 hom. )
Consequence
NF1
NM_001042492.3 missense
NM_001042492.3 missense
Scores
1
11
7
Clinical Significance
Conservation
PhyloP100: 7.33
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 Likely_benign. Variant got -1 ACMG points.
PP2
Missense variant in gene, where missense usually causes diseases (based on misZ statistic), NF1. . Gene score misZ: 6.5427 (greater than the threshold 3.09). Trascript score misZ: 8.4054 (greater than threshold 3.09). The gene has 399 curated pathogenic missense variants (we use a threshold of 10). The gene has 143 curated benign missense variants. GenCC has associacion of the gene with neurofibromatosis, familial spinal, hereditary pheochromocytoma-paraganglioma, neurofibromatosis type 1, Watson syndrome, neurofibromatosis-Noonan syndrome, Moyamoya disease, familial ovarian cancer.
BP4
Computational evidence support a benign effect (MetaRNN=0.38189813).
BS2
High AC in GnomAdExome4 at 17 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 0.0000116 AC: 17AN: 1461386Hom.: 0 Cov.: 31 AF XY: 0.0000124 AC XY: 9AN XY: 727020
GnomAD4 exome
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17
AN:
1461386
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Cov.:
31
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AC XY:
9
AN XY:
727020
Gnomad4 AFR exome
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GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Neurofibromatosis, type 1 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Oct 10, 2024 | This sequence change replaces alanine, which is neutral and non-polar, with glycine, which is neutral and non-polar, at codon 754 of the NF1 protein (p.Ala754Gly). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with NF1-related conditions. ClinVar contains an entry for this variant (Variation ID: 457576). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt NF1 protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Genome-Nilou Lab | Mar 15, 2022 | - - |
Hereditary cancer-predisposing syndrome;CN230736:Cardiovascular phenotype Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 05, 2024 | The p.A754G variant (also known as c.2261C>G), located in coding exon 19 of the NF1 gene, results from a C to G substitution at nucleotide position 2261. The alanine at codon 754 is replaced by glycine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | curation | Sema4, Sema4 | Feb 12, 2022 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
BayesDel_addAF
Uncertain
T
BayesDel_noAF
Benign
CADD
Uncertain
DANN
Uncertain
DEOGEN2
Uncertain
D;.;T
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D;D;D
M_CAP
Uncertain
D
MetaRNN
Benign
T;T;T
MetaSVM
Benign
T
MutationAssessor
Benign
L;L;.
PrimateAI
Uncertain
T
PROVEAN
Uncertain
D;D;N
REVEL
Benign
Sift
Uncertain
D;D;D
Sift4G
Uncertain
D;D;D
Polyphen
P;B;.
Vest4
MutPred
Gain of catalytic residue at A754 (P = 0.0209);Gain of catalytic residue at A754 (P = 0.0209);.;
MVP
MPC
ClinPred
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Varity_R
gMVP
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at