14-91869576-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_006329.4(FBLN5):c.*648G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00136 in 154,584 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0014 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0021 (0 hom.)
• Consequence: FBLN5 NM_006329.4 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -0.547

Genes affected

FBLN5 (HGNC:3602): (fibulin 5) The protein encoded by this gene is a secreted, extracellular matrix protein containing an Arg-Gly-Asp (RGD) motif and calcium-binding EGF-like domains. It promotes adhesion of endothelial cells through interaction of integrins and the RGD motif. It is prominently expressed in developing arteries but less so in adult vessels. However, its expression is reinduced in balloon-injured vessels and atherosclerotic lesions, notably in intimal vascular smooth muscle cells and endothelial cells. Therefore, the protein encoded by this gene may play a role in vascular development and remodeling. Defects in this gene are a cause of autosomal dominant cutis laxa, autosomal recessive cutis laxa type I (CL type I), and age-related macular degeneration type 3 (ARMD3). [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 14-91869576-C-T is Benign according to our data. Variant chr14-91869576-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 314861.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Benign=1}.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00135 (206/152164) while in subpopulation NFE AF= 0.00222 (151/68006). AF 95% confidence interval is 0.00193. There are 1 homozygotes in gnomad4. There are 103 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBLN5	NM_006329.4	c.*648G>A		3_prime_UTR_variant	11/11	ENST00000342058.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBLN5	ENST00000342058.9	c.*648G>A		3_prime_UTR_variant	11/11	1	NM_006329.4	P1

Frequencies

GnomAD3 genomes AF: 0.00135 AC: 206 AN: 152046 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000338

Gnomad AMI AF: 0.00659

Gnomad AMR AF: 0.00105

Gnomad ASJ AF: 0.000866

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00132

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00222

Gnomad OTH AF: 0.000956

GnomAD4 exome AF: 0.00207 AC: 5 AN: 2420 Hom.: 0 Cov.: 0 AF XY: 0.00326 AC XY: 4 AN XY: 1226

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00186

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: 0.00253

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00135 AC: 206 AN: 152164 Hom.: 1 Cov.: 32 AF XY: 0.00138 AC XY: 103 AN XY: 74388

Gnomad4 AFR AF: 0.000337

Gnomad4 AMR AF: 0.00105

Gnomad4 ASJ AF: 0.000866

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00132

Gnomad4 NFE AF: 0.00222

Gnomad4 OTH AF: 0.000946

Alfa AF: 0.00143 Hom.: 0

Bravo AF: 0.00132

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Macular degeneration, age-related, 3 Uncertain:1

Uncertain significance, 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Cutis laxa 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
Cadd	Benign	1.1
Dann	Benign	0.63

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs182435130; hg19: chr14-92335920;