rs147195031

Variant names:

• chr15-48420780-G-A
• rs147195031
• NM_000138.5:c.7726C>T

Your query was ambiguous. Multiple possible variants found:

• chr15-48420780-G-A
• chr15-48420780-G-C

Variant summary

Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PM6 PP2 PM2_Supporting PS4 PM1 PP1_Strong

This summary comes from the ClinGen Evidence Repository: The NM_00138 c.7726C>T is a missense variant in FBN1 predicted to cause a substitution of an arginine by cysteine at amino acid 2576 (p.Arg2576Cys) within a calcium binding EGF-like domain of the protein (PM1). This variant was found in a proband with aortic aneurysm and dissection and ectopia lentis, which is a highly specific phenotype for Marfan syndrome (MFS) (Internal lab data; PP4). This variant has been reported nine times in ClinVar: five times as pathogenic, three times as likely pathogenic, and once as uncertain significance (Variation ID: 36118). This variant has also been identified in at least 9 individuals with clinical diagnosis of MFS as well as in individuals with clinical features of MFS (PMID 24161884, 31830381, 33711475, 23278365, 33824467, 37042257, internal lab data; PS4). In three individuals with MFS, this variant was reported to be de novo, without confirmation of parental relationships (internal lab data, Prevention Genetics ClinVar, PM6). In at least 5 families with MFS, the variant was found to segregate with MFS and/or clinical features of MFS in several affected relatives (Internal lab data, Laboratory Corporation of America ClinVar, PP1_Strong). This variant is present in in 1/250782 (0.0004%) of alleles tested in gnomAD but did not pass the quality control criteria in the exome subset (PM2_Sup; https://gnomad.broadinstitute.org/ v2.1.1). Computational prediction tools and conservation analysis are inconclusive with regards to a possible impact on this variant’s protein function and structure (REVEL: 0.686). The constraint z-score for missense variants affecting FBN1 is 5.06 (PP2). In summary, this variant meets criteria to be classified as pathogenic for Marfan syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen FBN1 VCEP: PS4, PP1_Strong, PM1, PM6, PM2_Sup, PP2, PP4 LINK:https://erepo.genome.network/evrepo/ui/classification/CA017349/MONDO:0007947/022

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: FBN1 NM_000138.5 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:10 U:1
• Conservation: PhyloP100: 3.56
• Publications: 4 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):

• Marfan syndrome

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P, ClinGen, Orphanet, Genomics England PanelApp
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: Unknown, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Acromicric dysplasia

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

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

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

ACMG classification

Our verdict: Pathogenic. The variant received 14 ACMG points.

• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: For more information check the summary or visit ClinGen Evidence Repository.
• PP1: For more information check the summary or visit ClinGen Evidence Repository.
• PP2: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000138.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN1	NM_000138.5	MANE Select	c.7726C>T	p.Arg2576Cys	missense	Exon 63 of 66	NP_000129.3
	FBN1	NM_001406716.1		c.7726C>T	p.Arg2576Cys	missense	Exon 62 of 65	NP_001393645.1	P35555

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN1	ENST00000316623.10	TSL:1 MANE Select	c.7726C>T	p.Arg2576Cys	missense	Exon 63 of 66	ENSP00000325527.5	P35555
	FBN1	ENST00000559133.6	TSL:1	n.*534C>T		non_coding_transcript_exon	Exon 64 of 67	ENSP00000453958.2	H0YND0
	FBN1	ENST00000559133.6	TSL:1	n.*534C>T		3_prime_UTR	Exon 64 of 67	ENSP00000453958.2	H0YND0

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000399 AC: 1 AN: 250782 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.0000995

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461742 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727170

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5742

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111950

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
3	-	-	not provided (3)
1	1	-	Marfan syndrome (2)
1	-	-	Familial thoracic aortic aneurysm and aortic dissection (1)
1	-	-	FBN1-related disorder (1)
1	-	-	Isolated thoracic aortic aneurysm (1)
1	-	-	MARFAN SYNDROME, AUTOSOMAL RECESSIVE (1)
1	-	-	Marfan syndrome;C4707243:Familial thoracic aortic aneurysm and aortic dissection (1)
1	-	-	Marfan Syndrome/Loeys-Dietz Syndrome/Familial Thoracic Aortic Aneurysms and Dissections (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Pathogenic	33
DANN	Pathogenic	1.0
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Uncertain	0.21	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	0.66	D
PhyloP100		3.6
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.69
Sift	Uncertain	0.013	D
Sift4G	Uncertain	0.020	D
Vest4		0.93
MutPred		0.67		Loss of disorder (P = 0.0914)
MVP		0.92
MPC		1.7
ClinPred		0.98	D
GERP RS		6.0
Mutation Taster		=11/89	disease causing (ClinVar)

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: rs147195031; hg19: chr15-48712977; COSMIC: COSV106411660; COSMIC: COSV106411660;