chr17-31233091-C-G

Position:

• chr17-31233091-C-G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PM5 PP2 PP5_Very_Strong

The NM_001042492.3(NF1):​c.3586C>G​(p.Leu1196Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1196F) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NF1 NM_001042492.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 2.33

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]

NF1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-31233091-C-T is described in Lovd as [Pathogenic].
• 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). GenCC has associacion of gene with neurofibromatosis, familial spinal, hereditary pheochromocytoma-paraganglioma, neurofibromatosis type 1, Watson syndrome, neurofibromatosis-Noonan syndrome, Moyamoya disease, familial ovarian cancer.
• PP5: Variant 17-31233091-C-G is Pathogenic according to our data. Variant chr17-31233091-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 547629.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-31233091-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NF1	NM_001042492.3	c.3586C>G	p.Leu1196Val	missense_variant	27/58	ENST00000358273.9	NP_001035957.1
NF1	NM_000267.3	c.3586C>G	p.Leu1196Val	missense_variant	27/57		NP_000258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NF1	ENST00000358273.9	c.3586C>G	p.Leu1196Val	missense_variant	27/58	1	NM_001042492.3	ENSP00000351015.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurofibromatosis, type 1 Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Center for Human Genetics, Inc, Center for Human Genetics, Inc	Nov 01, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 09, 2023	This sequence change replaces leucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1196 of the NF1 protein (p.Leu1196Val). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt NF1 protein function. ClinVar contains an entry for this variant (Variation ID: 547629). This missense change has been observed in individual(s) with neurofibromatosis type 1 (PMID: 26740943; Invitae). This variant is not present in population databases (gnomAD no frequency). This variant disrupts the p.Leu1196 amino acid residue in NF1. Other variant(s) that disrupt this residue have been observed in individuals with NF1-related conditions (PMID: 15060124, 17103458, 22664660, 23047742, 27838393), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Oct 28, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Observed in a cohort of individuals with clinical characteristics of neurofibromatosis type 1 (Bianchessi et al., 2015); This variant is associated with the following publications: (PMID: 25486365, 22807134, 2121369, 26740943) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;.;T
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.97	D;D;D
M_CAP	Pathogenic	0.57	D
MetaRNN	Uncertain	0.45	T;T;T
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Uncertain	2.4	M;M;.
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-2.5	N;N;N
REVEL	Benign	0.10
Sift	Benign	0.096	T;T;T
Sift4G	Uncertain	0.0020	D;D;D
Polyphen		0.89	P;B;.
Vest4		0.90
MutPred		0.41		Gain of helix (P = 0.027);Gain of helix (P = 0.027);.;
MVP		0.72
MPC		1.7
ClinPred		0.93	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.27
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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

Other links and lift over

dbSNP: rs1555615039; hg19: chr17-29560109;