rs6493328

Variant names:

• chr15-48527305-G-A
• rs6493328
• NM_000138.5:c.863-1050C>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000138.5(FBN1):​c.863-1050C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.482 in 152,108 control chromosomes in the GnomAD database, including 22,224 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 0.48 (22224 hom., cov: 33)
• Consequence: FBN1 NM_000138.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.02
• Publications: 3 publications found

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]

FBN1 Gene-Disease associations (from GenCC):

• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Marfan syndrome

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen, G2P, PanelApp Australia, Orphanet, Ambry Genetics
• Acromicric dysplasia

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• progeroid and marfanoid aspect-lipodystrophy syndrome

  Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• stiff skin syndrome

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Weill-Marchesani syndrome 2, dominant

  Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• geleophysic dysplasia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• isolated ectopia lentis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• neonatal Marfan syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Weill-Marchesani syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ectopia lentis 1, isolated, autosomal dominant

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• Shprintzen-Goldberg syndrome

  Inheritance: AD, Unknown Classification: LIMITED, NO_KNOWN Submitted by: ClinGen, Labcorp Genetics (formerly Invitae)

LOC124903488 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.858 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FBN1	NM_000138.5	c.863-1050C>T		intron_variant	Intron 8 of 65	ENST00000316623.10	NP_000129.3
LOC124903488	XR_007064628.1	n.1055G>A		non_coding_transcript_exon_variant	Exon 1 of 3
FBN1	NM_001406716.1	c.863-1050C>T		intron_variant	Intron 7 of 64		NP_001393645.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FBN1	ENST00000316623.10	c.863-1050C>T		intron_variant	Intron 8 of 65	1	NM_000138.5	ENSP00000325527.5
FBN1	ENST00000559133.6	n.863-1050C>T		intron_variant	Intron 8 of 66	1		ENSP00000453958.2
FBN1	ENST00000537463.6	n.636+10406C>T		intron_variant	Intron 7 of 30	5		ENSP00000440294.2
FBN1	ENST00000674301.2	n.863-1050C>T		intron_variant	Intron 8 of 67			ENSP00000501333.2

Frequencies

GnomAD3 genomes AF: 0.482 AC: 73258 AN: 151990 Hom.: 22161 Cov.: 33

Gnomad AFR AF: 0.865

Gnomad AMI AF: 0.516

Gnomad AMR AF: 0.388

Gnomad ASJ AF: 0.240

Gnomad EAS AF: 0.564

Gnomad SAS AF: 0.373

Gnomad FIN AF: 0.346

Gnomad MID AF: 0.290

Gnomad NFE AF: 0.307

Gnomad OTH AF: 0.437

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

GnomAD4 genome AF: 0.482 AC: 73388 AN: 152108 Hom.: 22224 Cov.: 33 AF XY: 0.479 AC XY: 35648 AN XY: 74350

African (AFR) AF: 0.865 AC: 35927 AN: 41528

American (AMR) AF: 0.388 AC: 5932 AN: 15274

Ashkenazi Jewish (ASJ) AF: 0.240 AC: 833 AN: 3470

East Asian (EAS) AF: 0.564 AC: 2917 AN: 5174

South Asian (SAS) AF: 0.371 AC: 1787 AN: 4822

European-Finnish (FIN) AF: 0.346 AC: 3648 AN: 10548

Middle Eastern (MID) AF: 0.295 AC: 86 AN: 292

European-Non Finnish (NFE) AF: 0.307 AC: 20857 AN: 67980

Other (OTH) AF: 0.441 AC: 931 AN: 2110

Alfa AF: 0.363 Hom.: 15520

Bravo AF: 0.502

Asia WGS AF: 0.560 AC: 1946 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.33
DANN	Benign	0.52
PhyloP100		-1.0
Mutation Taster		=100/0	polymorphism (auto)

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: rs6493328; hg19: chr15-48819502;