Gene: SEPTIN5
Alternate names for this Gene: CDCREL|CDCREL-1|CDCREL1|H5|HCDCREL-1|PNUTL1|SEPT5
Gene Summary: This gene is a member of the septin gene family of nucleotide binding proteins, originally described in yeast as cell division cycle regulatory proteins. Septins are highly conserved in yeast, Drosophila, and mouse and appear to regulate cytoskeletal organization. Disruption of septin function disturbs cytokinesis and results in large multinucleate or polyploid cells. This gene is mapped to 22q11, the region frequently deleted in DiGeorge and velocardiofacial syndromes. A translocation involving the MLL gene and this gene has also been reported in patients with acute myeloid leukemia. Alternative splicing results in multiple transcript variants. The presence of a non-consensus polyA signal (AACAAT) in this gene also results in read-through transcription into the downstream neighboring gene (GP1BB; platelet glycoprotein Ib), whereby larger, non-coding transcripts are produced.
Gene is located in Chromosome: 22
Location in Chromosome : 22q11.21
Description of this Gene: septin 5
Type of Gene: protein-coding
Gene: SEPT5-GP1BB
Alternate names for this Gene: GP1BB|GPIb-beta|GPIbB
Gene Summary: This locus represents naturally occurring read-through transcription between the neighboring SEPT5 (septin 5) and GP1BB (glycoprotein Ib (platelet), beta polypeptide) genes on chromosome 22. This read-through transcription arises from inefficient use of an imperfect polyA signal in the upstream SEPT5 gene, whereby transcription continues into the GP1BB gene. Alternative splicing results in multiple read-through variants. The read-through transcripts are candidates for nonsense-mediated mRNA decay (NMD), and are therefore unlikely to produce protein products.
Gene is located in Chromosome: 22
Location in Chromosome : 22q11.21
Description of this Gene: SEPT5-GP1BB readthrough
Type of Gene: ncRNA
Gene: GP1BB
Alternate names for this Gene: BDPLT1|BS|CD42C|GPIBB|GPIbbeta
Gene Summary: Platelet glycoprotein Ib (GPIb) is a heterodimeric transmembrane protein consisting of a disulfide-linked 140 kD alpha chain and 22 kD beta chain. It is part of the GPIb-V-IX system that constitutes the receptor for von Willebrand factor (VWF), and mediates platelet adhesion in the arterial circulation. GPIb alpha chain provides the VWF binding site, and GPIb beta contributes to surface expression of the receptor and participates in transmembrane signaling through phosphorylation of its intracellular domain. Mutations in the GPIb beta subunit have been associated with Bernard-Soulier syndrome, velocardiofacial syndrome and giant platelet disorder. The 206 amino acid precursor of GPIb beta is synthesized from a 1.0 kb mRNA expressed in plateletes and megakaryocytes. A 411 amino acid protein arising from a longer, unspliced transcript in endothelial cells has been described; however, the authenticity of this product has been questioned. Yet another less abundant GPIb beta mRNA species of 3.5 kb, expressed in nonhematopoietic tissues such as endothelium, brain and heart, was shown to result from inefficient usage of a non-consensus polyA signal in the neighboring upstream gene (SEPT5, septin 5). In the absence of polyadenylation from its own imperfect site, the SEPT5 gene produces read-through transcripts that use the consensus polyA signal of this gene.
Gene is located in Chromosome: 22
Location in Chromosome : 22q11.21
Description of this Gene: glycoprotein Ib platelet subunit beta
Type of Gene: protein-coding