17-31227227-C-G

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP2BP4BS2_Supporting

The NM_001042492.3(NF1):ā€‹c.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

Scores

1
11
7

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 7.33
Variant links:
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

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
NF1NM_001042492.3 linkc.2261C>G p.Ala754Gly missense_variant 19/58 ENST00000358273.9 NP_001035957.1 P21359-1
NF1NM_000267.3 linkc.2261C>G p.Ala754Gly missense_variant 19/57 NP_000258.1 P21359-2

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
NF1ENST00000358273.9 linkc.2261C>G p.Ala754Gly missense_variant 19/581 NM_001042492.3 ENSP00000351015.4 P21359-1

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
AF:
0.0000116
AC:
17
AN:
1461386
Hom.:
0
Cov.:
31
AF XY:
0.0000124
AC XY:
9
AN XY:
727020
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000144
Gnomad4 OTH exome
AF:
0.0000166
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 submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpOct 10, 2024This 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 submitterclinical testingGenome-Nilou LabMar 15, 2022- -
Hereditary cancer-predisposing syndrome;CN230736:Cardiovascular phenotype Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingAmbry GeneticsJul 05, 2024The 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 submittercurationSema4, Sema4Feb 12, 2022- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
0.24
BayesDel_addAF
Uncertain
0.027
T
BayesDel_noAF
Benign
-0.20
CADD
Uncertain
25
DANN
Uncertain
1.0
DEOGEN2
Uncertain
0.78
D;.;T
Eigen
Uncertain
0.23
Eigen_PC
Uncertain
0.38
FATHMM_MKL
Pathogenic
1.0
D
LIST_S2
Uncertain
0.94
D;D;D
M_CAP
Uncertain
0.11
D
MetaRNN
Benign
0.38
T;T;T
MetaSVM
Benign
-0.77
T
MutationAssessor
Benign
1.7
L;L;.
PrimateAI
Uncertain
0.64
T
PROVEAN
Uncertain
-2.5
D;D;N
REVEL
Benign
0.12
Sift
Uncertain
0.017
D;D;D
Sift4G
Uncertain
0.012
D;D;D
Polyphen
0.47
P;B;.
Vest4
0.73
MutPred
0.39
Gain of catalytic residue at A754 (P = 0.0209);Gain of catalytic residue at A754 (P = 0.0209);.;
MVP
0.52
MPC
0.79
ClinPred
0.94
D
GERP RS
5.3
RBP_binding_hub_radar
0.0
RBP_regulation_power_radar
1.7
Varity_R
0.42
gMVP
0.43

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.050
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs1555613912; hg19: chr17-29554245; API