NM_000138.5(FBN1):c.1849_1851del (p.Cys617del) AND multiple conditions

Germline classification:: Likely pathogenic (1 submission)
Last evaluated:: Feb 5, 2020
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:: RCV001377380.9

Allele description [Variation Report for NM_000138.5(FBN1):c.1849_1851del (p.Cys617del)]

NM_000138.5(FBN1):c.1849_1851del (p.Cys617del)

Gene:

FBN1:fibrillin 1 [Gene - OMIM - HGNC]

Variant type:

Deletion

Cytogenetic location:

15q21.1

Genomic location:

Preferred name:

NM_000138.5(FBN1):c.1849_1851del (p.Cys617del)

HGVS:

NC_000015.10:g.48505134_48505136del
NG_008805.2:g.145653_145655del
NM_000138.5:c.1849_1851delMANE SELECT
NP_000129.3:p.Cys617del
LRG_778:g.145653_145655del
NC_000015.9:g.48797331_48797333del

Protein change:

C617del

Links:

dbSNP: rs2141317465

NCBI 1000 Genomes Browser:

rs2141317465

Molecular consequence:

NM_000138.5:c.1849_1851del - inframe_deletion - [Sequence Ontology: SO:0001822]

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 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
SCV001574700	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Likely pathogenic (Feb 5, 2020)	germline	clinical testing	PubMed (6) [See all records that cite these PMIDs] 16905551, 19349279, 16571647, 17701892, 29357934, 28492532

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV001574700

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Likely pathogenic
(Feb 5, 2020)

germline

clinical testing

PubMed (6)
[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

Marfan syndrome-causing mutations in fibrillin-1 result in gross morphological alterations and highlight the structural importance of the second hybrid domain.

Mellody KT, Freeman LJ, Baldock C, Jowitt TA, Siegler V, Raynal BD, Cain SA, Wess TJ, Shuttleworth CA, Kielty CM.

J Biol Chem. 2006 Oct 20;281(42):31854-62. Epub 2006 Aug 10.

PubMed [citation]

PMID:: 16905551

Latent transforming growth factor beta-binding proteins and fibulins compete for fibrillin-1 and exhibit exquisite specificities in binding sites.

Ono RN, Sengle G, Charbonneau NL, Carlberg V, Bächinger HP, Sasaki T, Lee-Arteaga S, Zilberberg L, Rifkin DB, Ramirez F, Chu ML, Sakai LY.

J Biol Chem. 2009 Jun 19;284(25):16872-16881. doi: 10.1074/jbc.M809348200. Epub 2009 Apr 6.

PubMed [citation]

PMID:: 19349279
PMCID:: PMC2719323

See all PubMed Citations (6)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001574700.6

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (6)

Description

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). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Cys617 amino acid residue in FBN1. Other variant(s) that disrupt this residue have been observed in individuals with FBN1-related conditions (PMID: 29357934), which suggests that this may be a clinically significant amino acid residue. This variant has been observed in individual(s) with clinical features of Marfan syndrome (Invitae). This variant is not present in population databases (ExAC no frequency). This variant, c.1849_1851del, results in the deletion of 1 amino acid(s) of the FBN1 protein (p.Cys617del), but otherwise preserves the integrity of the reading frame.

#	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: Jun 22, 2025

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