NM_000138.5(FBN1):c.3422C>T (p.Pro1141Leu) AND Marfan syndrome

Germline classification:: Benign (4 submissions)
Last evaluated:: Dec 1, 2022
Review status:: 3 stars out of maximum of 4 stars
reviewed by expert panel

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:: RCV000266428.15

Allele description [Variation Report for NM_000138.5(FBN1):c.3422C>T (p.Pro1141Leu)]

NM_000138.5(FBN1):c.3422C>T (p.Pro1141Leu)

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.3422C>T (p.Pro1141Leu)

Other names:

p.P1141L:CCG>CTG; NM_000138.5(FBN1):c.3422C>T

HGVS:

NC_000015.10:g.48487353G>A
NG_008805.2:g.163436C>T
NM_000138.5:c.3422C>TMANE SELECT
NP_000129.3:p.Pro1141Leu
NP_000129.3:p.Pro1141Leu
LRG_778t1:c.3422C>T
LRG_778:g.163436C>T
LRG_778p1:p.Pro1141Leu
NC_000015.9:g.48779550G>A
NM_000138.4:c.3422C>T
c.3422C>T

Protein change:

P1141L

Links:

dbSNP: rs2228241

NCBI 1000 Genomes Browser:

rs2228241

Molecular consequence:

NM_000138.5:c.3422C>T - 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

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000392452	Illumina Laboratory Services, Illumina	criteria provided, single submitter (ICSL Variant Classification Criteria 13 December 2019)	Likely benign (May 1, 2019)	germline	clinical testing	Citation Link,
SCV000781352	Center for Human Genetics, Inc, Center for Human Genetics, Inc	criteria provided, single submitter (ACMG Guidelines, 2015)	Likely benign (Nov 1, 2016)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV000786963	Center for Medical Genetics Ghent, University of Ghent	no assertion criteria provided	Uncertain significance (Nov 7, 2017)	germline	clinical testing
SCV003762207	ClinGen FBN1 Variant Curation Expert Panel, ClinGen	reviewed by expert panel (Assertion Criteria VCEP FBN1 Version 1)	Benign (Dec 1, 2022)	germline	curation	Citation Link

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Summary from all submissions

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

Citations

PubMed

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee.

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Details of each submission

From Illumina Laboratory Services, Illumina, SCV000392452.3

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign.

#	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

From Center for Human Genetics, Inc, Center for Human Genetics, Inc, SCV000781352.2

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

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

From Center for Medical Genetics Ghent, University of Ghent, SCV000786963.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

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

From ClinGen FBN1 Variant Curation Expert Panel, ClinGen, SCV003762207.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	curation	not provided

Description

NM_00138 c.3422C>T is a missense variant in FBN1 predicted to cause a substitution of a Proline by Leucine at amino acid 1141 (p.Pro1141Leu). This variant has been reported in the literature in at least 3 individuals in association with thoracic aortic aneurysm and dissection (TAAD), MASS syndrome, and features possibly consistent with Marfan syndrome (PMID: 10533071; PMID: 24740214; PMID: 26188975). This variant was also identified in an internal proband with isolated TAAD with a family history highly specific for Marfan syndrome, however it does not segregate with disease in an affected family member (BS4) and therefore PP4 cannot be used. This variant has been previously reported in ClinVar as benign, likely benign, and uncertain significance (Variation ID: 42334). This variant has been identified in 0.026% of individuals of European origin (BS1; https://gnomad.broadinstitute.org/ version 2.1.1). Computational prediction tools and conservation analysis are unclear on the predicted impact on the protein. The constraint z-score for missense variants affecting FBN1 is 5.06, however due to the presence of two benign arguments PP2 cannot be used. In summary, this variant meets criteria to be classified as benign for Marfan syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen FBN1 VCEP: BS1, BS4

#	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: Nov 24, 2024

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