17-31232043-ATTTTTTTTTTTTTTT-ATTTT

Variant names:

• chr17-31232043-ATTTTTTTTTTT-A
• rs371047262
• NM_001042492.3:c.3198-14_3198-4delTTTTTTTTTTT

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP6 BS2_Supporting

The NM_001042492.3(NF1):​c.3198-14_3198-4delTTTTTTTTTTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000644 in 589,918 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely benign (no stars).

• Frequency:
  • Genomes: 𝑓 0.000088 (0 hom., cov: 0)
  • Exomes 𝑓: 0.000060 (0 hom.)
• Consequence: NF1 NM_001042492.3 splice_region, intron
• Clinical Significance: Likely benign no assertion criteria provided B:1
• Conservation: PhyloP100: 3.14
• Publications: 2 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: Likely_benign. The variant received -2 ACMG points.

• BP6: Variant 17-31232043-ATTTTTTTTTTT-A is Benign according to our data. Variant chr17-31232043-ATTTTTTTTTTT-A is described in ClinVar as Likely_benign. ClinVar VariationId is 3032596.Status of the report is no_assertion_criteria_provided, 0 stars.
• BS2: High AC in GnomAd4 at 8 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001042492.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NF1	NM_001042492.3	MANE Select	c.3198-14_3198-4delTTTTTTTTTTT		splice_region intron	N/A	NP_001035957.1
	NF1	NM_000267.4		c.3198-14_3198-4delTTTTTTTTTTT		splice_region intron	N/A	NP_000258.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NF1	ENST00000358273.9	TSL:1 MANE Select	c.3198-29_3198-19delTTTTTTTTTTT		intron	N/A	ENSP00000351015.4
	NF1	ENST00000356175.7	TSL:1	c.3198-29_3198-19delTTTTTTTTTTT		intron	N/A	ENSP00000348498.3
	NF1	ENST00000579081.6	TSL:1	n.3198-29_3198-19delTTTTTTTTTTT		intron	N/A	ENSP00000462408.2

Frequencies

GnomAD3 genomes AF: 0.0000880 AC: 8 AN: 90908 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000134

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000424

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0102

Gnomad NFE AF: 0.0000209

Gnomad OTH AF: 0.000820

GnomAD4 exome AF: 0.0000601 AC: 30 AN: 499014 Hom.: 0 AF XY: 0.0000686 AC XY: 18 AN XY: 262428

African (AFR) AF: 0.000197 AC: 2 AN: 10162

American (AMR) AF: 0.0000624 AC: 1 AN: 16036

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 12226

East Asian (EAS) AF: 0.000119 AC: 2 AN: 16806

South Asian (SAS) AF: 0.000210 AC: 9 AN: 42948

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 28846

Middle Eastern (MID) AF: 0.00119 AC: 2 AN: 1682

European-Non Finnish (NFE) AF: 0.0000373 AC: 13 AN: 348460

Other (OTH) AF: 0.0000458 AC: 1 AN: 21848

GnomAD4 genome AF: 0.0000880 AC: 8 AN: 90904 Hom.: 0 Cov.: 0 AF XY: 0.000167 AC XY: 7 AN XY: 42042

African (AFR) AF: 0.000134 AC: 3 AN: 22460

American (AMR) AF: 0.00 AC: 0 AN: 7430

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2612

East Asian (EAS) AF: 0.00 AC: 0 AN: 2712

South Asian (SAS) AF: 0.000425 AC: 1 AN: 2352

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 3380

Middle Eastern (MID) AF: 0.0115 AC: 2 AN: 174

European-Non Finnish (NFE) AF: 0.0000209 AC: 1 AN: 47880

Other (OTH) AF: 0.000816 AC: 1 AN: 1226

Alfa AF: 0.00 Hom.: 224

Bravo AF: 0.0000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

Submissions by phenotype

NF1-related disorder Benign:1

Oct 26, 2020

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		3.1
Mutation Taster		=100/0	polymorphism

Splicing

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

Other links and lift over

dbSNP: rs371047262; hg19: chr17-29559061;