chr17-17219222-T-C

Position:

• chr17-17219222-T-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The ENST00000285071.9(FLCN):​c.872-13A>G variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00288 in 1,613,266 control chromosomes in the GnomAD database, including 99 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.015 (58 hom., cov: 31)
  • Exomes 𝑓: 0.0016 (41 hom.)
• Consequence: FLCN ENST00000285071.9 splice_polypyrimidine_tract, intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:12
• Conservation: PhyloP100: -1.52

Genes affected

FLCN (HGNC:27310): (folliculin) This gene is located within the Smith-Magenis syndrome region on chromosome 17. Mutations in this gene are associated with Birt-Hogg-Dube syndrome, which is characterized by fibrofolliculomas, renal tumors, lung cysts, and pneumothorax. Alternative splicing of this gene results in two transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 17-17219222-T-C is Benign according to our data. Variant chr17-17219222-T-C is described in ClinVar as [Benign]. Clinvar id is 262549.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr17-17219222-T-C is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0507 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FLCN	NM_144997.7	c.872-13A>G		splice_polypyrimidine_tract_variant, intron_variant		ENST00000285071.9	NP_659434.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FLCN	ENST00000285071.9	c.872-13A>G		splice_polypyrimidine_tract_variant, intron_variant		1	NM_144997.7	ENSP00000285071	P1

Frequencies

GnomAD3 genomes AF: 0.0153 AC: 2324 AN: 152190 Hom.: 58 Cov.: 31

Gnomad AFR AF: 0.0525

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00641

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000220

Gnomad OTH AF: 0.0167

GnomAD3 exomes AF: 0.00414 AC: 1038 AN: 250850 Hom.: 20 AF XY: 0.00300 AC XY: 407 AN XY: 135662

Gnomad AFR exome AF: 0.0552

Gnomad AMR exome AF: 0.00304

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000220

Gnomad OTH exome AF: 0.000979

GnomAD4 exome AF: 0.00159 AC: 2319 AN: 1460958 Hom.: 41 Cov.: 35 AF XY: 0.00135 AC XY: 982 AN XY: 726844

Gnomad4 AFR exome AF: 0.0521

Gnomad4 AMR exome AF: 0.00311

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000151

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000166

Gnomad4 OTH exome AF: 0.00359

GnomAD4 genome AF: 0.0153 AC: 2331 AN: 152308 Hom.: 58 Cov.: 31 AF XY: 0.0149 AC XY: 1113 AN XY: 74484

Gnomad4 AFR AF: 0.0525

Gnomad4 AMR AF: 0.00640

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000220

Gnomad4 OTH AF: 0.0166

Alfa AF: 0.00531 Hom.: 3

Bravo AF: 0.0166

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:12

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 03, 2015	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Feb 07, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	May 04, 2016	Variant summary: The FLCN variant, c.872-13A>G is located at a non-conserved intronic position, not widely known to affect splicing, with 4/5 in silico programs via Alamut predicting no significant effect on splicing, although these predictions have yet to be functionally assessed. The variant of interest was observed in the large, broad control population, ExAC, with an allele frequency of 608/121210 (1/199 including 12 homozygotes), which exceeds the estimated maximum expected allele frequency for a pathogenic FLCN variant of 1/769230. The variant of interest, to our knowledge, has not been reported in affected individuals via publications. A reputable clinical laboratory cites the variant as a "VOUS," although this evaluation was done prior to the availability of the ExAC population. Therefore, taking all available lines of evidence into consideration, the variant of interest is classified as Benign. -

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 01, 2017	- -

Birt-Hogg-Dube syndrome Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -
Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	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. -

Familial spontaneous pneumothorax Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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. -

Hereditary cancer-predisposing syndrome Benign:1

Benign, criteria provided, single submitter

curation

Sema4, Sema4

Feb 24, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.050
DANN	Benign	0.50
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs114970273; hg19: chr17-17122536;