NM_000138.5(FBN1):c.3976T>C (p.Cys1326Arg) AND multiple conditions

Germline classification:: Pathogenic (1 submission)
Last evaluated:: Aug 21, 2022
Review status:: 1 star out of maximum of 4 stars
criteria provided, single submitter

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV003041233.2

Allele description [Variation Report for NM_000138.5(FBN1):c.3976T>C (p.Cys1326Arg)]

NM_000138.5(FBN1):c.3976T>C (p.Cys1326Arg)

Gene:

FBN1:fibrillin 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

15q21.1

Genomic location:

Preferred name:

NM_000138.5(FBN1):c.3976T>C (p.Cys1326Arg)

HGVS:

NC_000015.10:g.48474639A>G
NG_008805.2:g.176150T>C
NM_000138.5:c.3976T>CMANE SELECT
NM_001406716.1:c.3976T>C
NP_000129.3:p.Cys1326Arg
NP_000129.3:p.Cys1326Arg
NP_001393645.1:p.Cys1326Arg
LRG_778t1:c.3976T>C
LRG_778:g.176150T>C
LRG_778p1:p.Cys1326Arg
NC_000015.9:g.48766836A>G
NM_000138.4:c.3976T>C

Protein change:

C1326R

Molecular consequence:

NM_000138.5:c.3976T>C - missense variant - [Sequence Ontology: SO:0001583]
NM_001406716.1:c.3976T>C - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Marfan syndrome (MFS)
Synonyms:: MARFAN SYNDROME, TYPE I; Marfan syndrome type 1; Marfan's syndrome; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0007947; MedGen: C0024796; Orphanet: 284963; Orphanet: 558; OMIM: 154700

Name:: Familial thoracic aortic aneurysm and aortic dissection (TAAD)
Synonyms:: Thoracic aortic aneurysm and aortic dissection; Thoracic aortic aneurysms and dissections
Identifiers:: MONDO: MONDO:0019625; MedGen: C4707243; Orphanet: 91387; OMIM: PS607086

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV003443573	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Pathogenic (Aug 21, 2022)	germline	clinical testing	PubMed (7) [See all records that cite these PMIDs] 10486319, 17657824, 16905551, 19349279, 16571647, 17701892, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV003443573

Invitae

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Pathogenic
(Aug 21, 2022)

germline

clinical testing

PubMed (7)
[See all records that cite these PMIDs]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Cysteine substitutions in epidermal growth factor-like domains of fibrillin-1: distinct effects on biochemical and clinical phenotypes.

Schrijver I, Liu W, Brenn T, Furthmayr H, Francke U.

Am J Hum Genet. 1999 Oct;65(4):1007-20.

PubMed [citation]

PMID:: 10486319
PMCID:: PMC1288233

The importance of mutation detection in Marfan syndrome and Marfan-related disorders: report of 193 FBN1 mutations.

Comeglio P, Johnson P, Arno G, Brice G, Evans A, Aragon-Martin J, da Silva FP, Kiotsekoglou A, Child A.

Hum Mutat. 2007 Sep;28(9):928.

PubMed [citation]

PMID:: 17657824

See all PubMed Citations (7)

Details of each submission

From Invitae, SCV003443573.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (7)

Description

This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 1326 of the FBN1 protein (p.Cys1326Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with Marfan syndrome (PMID: 10486319, 17657824). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt FBN1 protein function. This variant affects a cysteine residue in the EGF-like, TGFBP or hybrid motif domains of FBN1. Cysteine residues are believed to be involved in intramolecular disulfide bridges and have been shown to be important for FBN1 protein structure (PMID: 16905551, 19349279). In addition, missense substitutions affecting cysteine residues within these domains are significantly overrepresented among patients with Marfan syndrome (PMID: 16571647, 17701892). For these reasons, this variant has been classified as Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Feb 28, 2024

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