chr17-31095288-G-C

Variant names:

• chr17-31095288-G-C
• rs556823296
• ENST00000579081.6:n.-22G>C

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The ENST00000579081.6(NF1):​n.-22G>C variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00598 in 1,534,806 control chromosomes in the GnomAD database, including 34 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0038 (1 hom., cov: 30)
  • Exomes 𝑓: 0.0062 (33 hom.)
• Consequence: NF1 ENST00000579081.6 non_coding_transcript_exon
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:11
• Conservation: PhyloP100: 1.40
• Publications: 1 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]

MIR4733HG (HGNC:55332): (MIR4733 host gene)

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 17-31095288-G-C is Benign according to our data. Variant chr17-31095288-G-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 257274.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00384 (583/151872) while in subpopulation NFE AF = 0.00597 (405/67892). AF 95% confidence interval is 0.00549. There are 1 homozygotes in GnomAd4. There are 269 alleles in the male GnomAd4 subpopulation. Median coverage is 30. This position passed quality control check.
• BS2: High AC in GnomAd4 at 583 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NF1	NM_001042492.3	c.-22G>C		5_prime_UTR_variant	Exon 1 of 58	ENST00000358273.9	NP_001035957.1
MIR4733HG	NR_186435.1	n.203C>G		non_coding_transcript_exon_variant	Exon 1 of 4
NF1	NM_000267.4	c.-22G>C		5_prime_UTR_variant	Exon 1 of 57		NP_000258.1
NF1	NM_001128147.3	c.-22G>C		5_prime_UTR_variant	Exon 1 of 15		NP_001121619.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NF1	ENST00000358273.9	c.-22G>C		5_prime_UTR_variant	Exon 1 of 58	1	NM_001042492.3	ENSP00000351015.4

Frequencies

GnomAD3 genomes AF: 0.00384 AC: 583 AN: 151754 Hom.: 1 Cov.: 30

Gnomad AFR AF: 0.00133

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00125

Gnomad ASJ AF: 0.00347

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00396

Gnomad FIN AF: 0.00633

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00596

Gnomad OTH AF: 0.00288

GnomAD2 exomes AF: 0.00383 AC: 502 AN: 131034 AF XY: 0.00408

Gnomad AFR exome AF: 0.000622

Gnomad AMR exome AF: 0.00164

Gnomad ASJ exome AF: 0.00186

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00643

Gnomad NFE exome AF: 0.00631

Gnomad OTH exome AF: 0.00547

GnomAD4 exome AF: 0.00622 AC: 8601 AN: 1382934 Hom.: 33 Cov.: 32 AF XY: 0.00626 AC XY: 4269 AN XY: 682374

African (AFR) AF: 0.000699 AC: 22 AN: 31478

American (AMR) AF: 0.00163 AC: 58 AN: 35620

Ashkenazi Jewish (ASJ) AF: 0.00195 AC: 49 AN: 25118

East Asian (EAS) AF: 0.00 AC: 0 AN: 35700

South Asian (SAS) AF: 0.00334 AC: 264 AN: 79050

European-Finnish (FIN) AF: 0.00676 AC: 247 AN: 36512

Middle Eastern (MID) AF: 0.00467 AC: 19 AN: 4072

European-Non Finnish (NFE) AF: 0.00710 AC: 7651 AN: 1077728

Other (OTH) AF: 0.00505 AC: 291 AN: 57656

GnomAD4 genome AF: 0.00384 AC: 583 AN: 151872 Hom.: 1 Cov.: 30 AF XY: 0.00362 AC XY: 269 AN XY: 74230

African (AFR) AF: 0.00133 AC: 55 AN: 41420

American (AMR) AF: 0.00124 AC: 19 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.00347 AC: 12 AN: 3462

East Asian (EAS) AF: 0.00 AC: 0 AN: 5136

South Asian (SAS) AF: 0.00396 AC: 19 AN: 4798

European-Finnish (FIN) AF: 0.00633 AC: 67 AN: 10584

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00597 AC: 405 AN: 67892

Other (OTH) AF: 0.00285 AC: 6 AN: 2106

Alfa AF: 0.00202 Hom.: 2

Bravo AF: 0.00358

Asia WGS AF: 0.000867 AC: 3 AN: 3474

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:11

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 29, 2019

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Benign:3

Mar 22, 2018

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Jun 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

NF1: BS2 -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Neurofibromatosis, type 1 Benign:2

Mar 15, 2022

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Neurofibromatosis-Noonan syndrome Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Neurofibromatosis, familial spinal Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Café-au-lait macules with pulmonary stenosis Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	19
DANN	Benign	0.90
PhyloP100		1.4
PromoterAI		0.21	Neutral
Mutation Taster		=296/4	polymorphism

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

Other links and lift over

dbSNP: rs556823296; hg19: chr17-29422306;