15-48610804-CCC-CG

Position:

• chr15-48610804-CCC-CG

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000138.5(FBN1):​c.268_269delinsC​(p.Gly90ArgfsTer18) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FBN1 NM_000138.5 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.38

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-48610805-CC-G is Pathogenic according to our data. Variant chr15-48610805-CC-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 42314.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN1	NM_000138.5	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant	4/66	ENST00000316623.10
FBN1	NM_001406716.1	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant	3/65
FBN1	NM_001406717.1	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant	4/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN1	ENST00000316623.10	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant	4/66	1	NM_000138.5	P1
FBN1	ENST00000559133.6	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant, NMD_transcript_variant	4/67	1
FBN1	ENST00000537463.6	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant, NMD_transcript_variant	4/31	5
FBN1	ENST00000674301.2	c.268_269delinsC	p.Gly90ArgfsTer18	frameshift_variant, NMD_transcript_variant	4/68

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Marfan syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 12, 2010

- -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs397515778; hg19: chr15-48903002;