chr15-48478956-A-G

Position:

• chr15-48478956-A-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000138.5(FBN1):​c.3964+2699T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0349 in 152,310 control chromosomes in the GnomAD database, including 406 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.035 (406 hom., cov: 32)
• Consequence: FBN1 NM_000138.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.819

Genes affected

FBN1 (HGNC:3603): (fibrillin 1) This gene encodes a member of the fibrillin family of proteins. The encoded preproprotein is proteolytically processed to generate two proteins including the extracellular matrix component fibrillin-1 and the protein hormone asprosin. Fibrillin-1 is an extracellular matrix glycoprotein that serves as a structural component of calcium-binding microfibrils. These microfibrils provide force-bearing structural support in elastic and nonelastic connective tissue throughout the body. Asprosin, secreted by white adipose tissue, has been shown to regulate glucose homeostasis. Mutations in this gene are associated with Marfan syndrome and the related MASS phenotype, as well as ectopia lentis syndrome, Weill-Marchesani syndrome, Shprintzen-Goldberg syndrome and neonatal progeroid syndrome. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.309 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN1	NM_000138.5	c.3964+2699T>C		intron_variant		ENST00000316623.10
FBN1	NM_001406716.1	c.3964+2699T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN1	ENST00000316623.10	c.3964+2699T>C		intron_variant		1	NM_000138.5	P1

Frequencies

GnomAD3 genomes AF: 0.0348 AC: 5300 AN: 152192 Hom.: 404 Cov.: 32

Gnomad AFR AF: 0.0220

Gnomad AMI AF: 0.0967

Gnomad AMR AF: 0.0802

Gnomad ASJ AF: 0.00807

Gnomad EAS AF: 0.321

Gnomad SAS AF: 0.0782

Gnomad FIN AF: 0.0177

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.0106

Gnomad OTH AF: 0.0440

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0349 AC: 5316 AN: 152310 Hom.: 406 Cov.: 32 AF XY: 0.0392 AC XY: 2923 AN XY: 74478

Gnomad4 AFR AF: 0.0220

Gnomad4 AMR AF: 0.0808

Gnomad4 ASJ AF: 0.00807

Gnomad4 EAS AF: 0.322

Gnomad4 SAS AF: 0.0787

Gnomad4 FIN AF: 0.0177

Gnomad4 NFE AF: 0.0106

Gnomad4 OTH AF: 0.0445

Alfa AF: 0.0204 Hom.: 32

Bravo AF: 0.0411

Asia WGS AF: 0.190 AC: 659 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	4.0
DANN	Benign	0.50

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: rs10519178; hg19: chr15-48771153;