chr17-31232071-A-G

Variant names:

• chr17-31232071-A-G
• rs1131691089
• NM_001042492.3:c.3198-2A>G

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1_Moderate PP5_Very_Strong

The NM_001042492.3(NF1):​c.3198-2A>G variant causes a splice acceptor, intron change involving the alteration of a conserved nucleotide. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 16)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: NF1 NM_001042492.3 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:9
• Conservation: PhyloP100: 8.85
• Publications: 4 publications found

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 Gene-Disease associations (from GenCC):

• neurofibromatosis type 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, PanelApp Australia, G2P, Genomics England PanelApp
• neurofibromatosis-Noonan syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, PanelApp Australia
• Moyamoya disease

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary pheochromocytoma-paraganglioma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial ovarian cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.013732394 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PP5: Variant 17-31232071-A-G is Pathogenic according to our data. Variant chr17-31232071-A-G is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 428967.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NF1	NM_001042492.3	c.3198-2A>G		splice_acceptor_variant, intron_variant	Intron 24 of 57	ENST00000358273.9	NP_001035957.1
NF1	NM_000267.4	c.3198-2A>G		splice_acceptor_variant, intron_variant	Intron 24 of 56		NP_000258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NF1	ENST00000358273.9	c.3198-2A>G		splice_acceptor_variant, intron_variant	Intron 24 of 57	1	NM_001042492.3	ENSP00000351015.4

Frequencies

GnomAD3 genomes Cov.: 16

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 431084 Hom.: 0 Cov.: 13 AF XY: 0.00 AC XY: 0 AN XY: 217812

African (AFR) AF: 0.00 AC: 0 AN: 8786

American (AMR) AF: 0.00 AC: 0 AN: 9422

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 10146

East Asian (EAS) AF: 0.00 AC: 0 AN: 15954

South Asian (SAS) AF: 0.00 AC: 0 AN: 17942

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 25778

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1508

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 323102

Other (OTH) AF: 0.00 AC: 0 AN: 18446

GnomAD4 genome Cov.: 16

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:9

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Neurofibromatosis, type 1 Pathogenic:5

Mar 15, 2022

Genome-Nilou Lab

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 26, 2020

Genome Diagnostics Laboratory, The Hospital for Sick Children

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 01, 2016

Center for Human Genetics, Inc, Center for Human Genetics, Inc

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 11, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects an acceptor splice site in intron 24 of the NF1 gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or altered protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individual(s) with neurofibromatosis type 1 (PMID: 23913538, 30014477, 31730495). ClinVar contains an entry for this variant (Variation ID: 428967). Studies have shown that disruption of this splice site results in activation of a cryptic splice site, and produces a non-functional protein and/or introduces a premature termination codon (PMID: 23913538; internal data). For these reasons, this variant has been classified as Pathogenic. -

Sep 02, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Neurofibromatosis, type 1;C0349639:Juvenile myelomonocytic leukemia;C0553586:Café-au-lait macules with pulmonary stenosis;C1834235:Neurofibromatosis, familial spinal;C2931482:Neurofibromatosis-Noonan syndrome Pathogenic:2

-

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2_Supporting+PVS1+PS4_Moderate+PP4 -

Jan 31, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:1

Sep 16, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site variant predicted to result in an in-frame loss of the adjacent exon in a gene for which loss of function is a known mechanism of disease; Deletions involving coding exons of this gene are a known mechanism of disease (HGMD); Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 18484666, 25525159, 26969325, 27862945, 23913538, 2121369, 25486365, 29973652, 30014477, 31730495, 34418705, 37272364, 37806041, 31766501) -

Hereditary cancer-predisposing syndrome Pathogenic:1

Jun 02, 2015

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3198-2A>G intronic pathogenic mutation results from an A to G substitution two nucleotides upstream from coding exon 25 in the NF1 gene. This mutation was seen in a 17 year old female who met NIH diagnostic criteria for NF1 andhad aplexiformneurofibromaremoved from her foot at age 16(UpadhyayaM, et al.Hum.Mutat. 2008;29(8):E103-11). In addition, thismutation was reportedin an individualclinically diagnosed with NF1 in a French cohort.RNA studies fromthis publication showed that this splice site mutationinactivatesthe authentic 3' splice site and activates use ofa cryptic site inexon25(also known as exon 19b)(Sabbagh A, et al. Hum. Mutat. 2013;34(11):1510-8).Based on the supporting evidence, c.3198-2A>Gis interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Uncertain	0.13
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	1.0	D
PhyloP100		8.8
GERP RS		5.3
Mutation Taster		=1/99	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.97		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.60		Position offset: 4
DS_AL_spliceai		0.97		Position offset: 2

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

Other links and lift over

dbSNP: rs1131691089; hg19: chr17-29559089; COSMIC: COSV62191779; COSMIC: COSV62191779;