rs760949880

chr17-31258415-T-Achr17-31258415-T-Cchr17-31258415-T-G

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PS1 PM1 PM2 PM5 PP2 PP3_Moderate PP5_Moderate

The NM_001042492.3(NF1):c.4245T>A(p.Asn1415Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,282 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in same amino acid change has been previously reported as Pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N1415D) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NF1 NM_001042492.3 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.213

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]

ACMG classification

Verdict is Pathogenic. Variant got 15 ACMG points.

• PS1: Transcript NM_001042492.3 (NF1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 941609
• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 15 uncertain in NM_001042492.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr17-31258413-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1067196.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant where missense usually causes diseases, NF1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.91
• PP5: Variant 17-31258415-T-A is Pathogenic according to our data. Variant chr17-31258415-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 566848.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NF1	NM_001042492.3	c.4245T>A	p.Asn1415Lys	missense_variant	32/58	ENST00000358273.9
NF1	NM_000267.3	c.4182T>A	p.Asn1394Lys	missense_variant	31/57

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NF1	ENST00000358273.9	c.4245T>A	p.Asn1415Lys	missense_variant	32/58	1	NM_001042492.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461282 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726950

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurofibromatosis, type 1 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Nov 12, 2022

Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. For these reasons, this variant has been classified as Pathogenic. This variant disrupts the p.Asn1394 amino acid residue in NF1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 31717729; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 566848). This missense change has been observed in individual(s) with clinical features of neurofibromatosis type 1 (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 1394 of the NF1 protein (p.Asn1394Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.079	D
BayesDel_noAF	Benign	-0.12
Cadd	Benign	19
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	D;.;D
Eigen	Benign	0.031
Eigen_PC	Benign	-0.0026
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Pathogenic	0.83	D
MetaRNN	Pathogenic	0.91	D;D;D
MetaSVM	Uncertain	0.26	D
MutationAssessor	Pathogenic	3.0	M;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-4.8	D;D;D
REVEL	Uncertain	0.53
Sift	Uncertain	0.0040	D;D;D
Sift4G	Uncertain	0.027	D;D;D
Polyphen		0.054	B;D;.
Vest4		0.98
MutPred		0.86		Gain of methylation at N1415 (P = 0.01);.;.;
MVP		0.87
MPC		0.81
ClinPred		0.99	D
GERP RS		-0.61
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		0.85

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: rs760949880; hg19: chr17-29585433;