chr17-31221866-A-G

Position:

• chr17-31221866-A-G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_001042492.3(NF1):​c.1658A>G​(p.His553Arg) variant causes a missense 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. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: NF1 NM_001042492.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 8.91

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 13 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.911
• PP5: Variant 17-31221866-A-G is Pathogenic according to our data. Variant chr17-31221866-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 420076.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-31221866-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NF1	NM_001042492.3	c.1658A>G	p.His553Arg	missense_variant	15/58	ENST00000358273.9	NP_001035957.1
NF1	NM_000267.3	c.1658A>G	p.His553Arg	missense_variant	15/57		NP_000258.1
NF1	NM_001128147.3	c.1658A>G	p.His553Arg	missense_variant	15/15		NP_001121619.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NF1	ENST00000358273.9	c.1658A>G	p.His553Arg	missense_variant	15/58	1	NM_001042492.3	ENSP00000351015.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1453936 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 723568

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurofibromatosis, type 1 Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Dec 19, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 22, 2023	ClinVar contains an entry for this variant (Variation ID: 420076). 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. For these reasons, this variant has been classified as Pathogenic. This missense change has been observed in individual(s) with neurofibromatosis type 1 (PMID: 16944272, 27322474, 27838393). In at least one individual the variant was observed to be de novo. This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 553 of the NF1 protein (p.His553Arg). This variant is not present in population databases (gnomAD no frequency). -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Mar 15, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Human Genetics, Inc, Center for Human Genetics, Inc	Nov 01, 2016	- -

Neurofibromatosis, type 1;C0349639:Juvenile myelomonocytic leukemia;C0553586:Café-au-lait macules with pulmonary stenosis;C1834235:Neurofibromatosis, familial spinal;C2931482:Neurofibromatosis-Noonan syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 01, 2024

- -

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Jan 08, 2024

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 16199547, 16944272, 20655465, 17879440, 27390349, 28862263, 31766501, 24803665, 31717729, 34392670, 36289852, 27838393, 25486365, 31370276, 27322474) -

Hereditary cancer-predisposing syndrome;CN230736:Cardiovascular phenotype Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 26, 2024

The p.H553R variant (also known as c.1658A>G), located in coding exon 15 of the NF1 gene, results from an A to G substitution at nucleotide position 1658. The histidine at codon 553 is replaced by arginine, an amino acid with highly similar properties. This alteration has been observed in multiple individuals with a personal and/or family history that is consistent with NF1-related disease (Ambry internal data; Yao R et al. Genes (Basel), 2019 10;10; Demir Gündoan B et al. Turk J Med Sci, 2021 Aug). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.96	D;.;.;D
Eigen	Pathogenic	0.85
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.68	T;T;T;T
M_CAP	Pathogenic	0.82	D
MetaRNN	Pathogenic	0.91	D;D;D;D
MetaSVM	Uncertain	-0.080	T
MutationAssessor	Uncertain	2.4	M;M;M;.
PrimateAI	Uncertain	0.78	T
PROVEAN	Pathogenic	-5.6	D;D;D;D
REVEL	Pathogenic	0.74
Sift	Uncertain	0.0020	D;D;D;D
Sift4G	Uncertain	0.0070	D;D;T;D
Polyphen		1.0	D;D;.;.
Vest4		0.78
MutPred		0.68		Loss of catalytic residue at L555 (P = 0.063);Loss of catalytic residue at L555 (P = 0.063);Loss of catalytic residue at L555 (P = 0.063);.;
MVP		0.93
MPC		1.8
ClinPred		0.99	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.84
gMVP		0.94

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: rs1064794274; hg19: chr17-29548884; COSMIC: COSV62201725; COSMIC: COSV62201725;