FBLN1

Fibulin 1 is a secreted glycoprotein that becomes incorporated into a fibrillar extracellular matrix. Calcium-binding is apparently required to mediate its binding to laminin and nidogen. It mediates platelet adhesion via binding fibrinogen. Four splice variants which differ in the 3' end have been identified. Each variant encodes a different isoform, but no functional distinctions have been identified among the four variants. [provided by RefSeq, Jul 2008]

Full Name

Fibulin 1

Research Area

Incorporated into fibronectin-containing matrix fibers. May play a role in cell adhesion and migration along protein fibers within the extracellular matrix (ECM). Could be important for certain developmental processes and contribute to the supramolecular organization of ECM architecture, in particular to those of basement membranes. Has been implicated in a role in cellular transformation and tumor invasion, it appears to be a tumor suppressor. May play a role in haemostasis and thrombosis owing to its ability to bind fibrinogen and incorporate into clots. Could play a significant role in modulating the neurotrophic activities of APP, particularly soluble APP.

Biological Process

Blood coagulation, fibrin clot formation Source: UniProtKB
Embryo implantation Source: Ensembl
Extracellular matrix organization Source: Ensembl
Negative regulation of cell adhesion Source: UniProtKB
Negative regulation of cell motility Source: UniProtKB
Negative regulation of ERK1 and ERK2 cascade Source: UniProtKB
Negative regulation of protein phosphorylation Source: UniProtKB
Negative regulation of stem cell proliferation Source: UniProtKB
Negative regulation of substrate adhesion-dependent cell spreading Source: UniProtKB
Negative regulation of transformation of host cell by virus Source: UniProtKB
Negative regulation of transforming growth factor beta production Source: UniProtKB
Positive regulation of fibroblast proliferation Source: UniProtKB
Positive regulation of gene expression Source: UniProtKB
Positive regulation of substrate-dependent cell migration, cell attachment to substrate Source: UniProtKB

Cellular Location

Extracellular matrix

Involvement in disease

A chromosomal aberration involving FBLN1 is found in a complex type of synpolydactyly referred to as 3/3-prime/4 synpolydactyly associated with metacarpal and metatarsal synostoses. Reciprocal translocation t(12;22)(p11.2;q13.3) with RASSF8. Fibroblasts derived from a patient with synpolydactyly displayed alterations in the level of isoform D splice variant incorporated into the ECM and secreted into the conditioned culture medium. By contrast, the expression of isoform C was not perturbed in the patients fibroblasts. Furthermore, no aberrant polypeptides were detected in extracts of cultured patients fibroblasts. The translocation t(12;22) may result in haploinsufficiency of the isoform D splice variant, which could lead to the observed limb malformation.
Elevated expression and altered processing of FBLN1 protein is associated with human breast cancer.