Cuticle and basement membrane collagens are extracellular matrix components encoded by a family of about 160 genes known to be expressed to which this gene belongs. Collagens have short interrupted blocks of Gly-X-Y sequence flanked by conserved cysteine residues, akin to vertebrate fibril-associated collagens with interrupted triple helix, and form trimers or higher order polymers. They have been grouped into five main subfamilies. The Caenorhabditis elegans cuticle is a complex multilayered extracellular matrix, consisting predominantly of cuticle collagens and synthesised by the underlying epidermal cell layer (called hypodermis). It is secreted five times during development, in embryos and before each molt, and is slightly different from stage to stage. During cuticle synthesis, the genes are expressed in a distinct temporal series, and the temporal groups contribute distinct discrete substructure of the extracellular matrix (McMahon et al, 2003). For a small number of collagen genes, with no distinctive sequence feature, but certainly critical to assembly or function of the extracellular matrix, such as dpy-2, 3, 7, 8, 10, 5 or 13, sqt-3, lon-3, bli-1, bli-2 or ram-4, loss of function causes a change in body shape (dumpy, squat, long, blistered), or leads to animals that roll when moving (helically twisted), or to male ray morphology defects. Some collagens that participate in the inner basement membranes such as let-2, emb-9, cle-1, mec-5 or unc-122 are essential for viability, or play critical roles in synaptogenesis or synaptic transmission, muscle attachment, cell migration and process guidance. But most other collagens probably have a redundant role, since loss of their function is apparently wild type, and alleles with visible effects in these genes are gain of function mutations. [Main specialists: Jim Kramer and Iain Johnstone][Wormbase] A cuticle collagen involved in strut assembly in the adult cuticle.
Wormbase predicts one model
AceView synopsis, each blue text links to tables and details
According to AceView, this gene is well expressed
, 0.5 times the average gene in this release, down regulated in dauer [SAGE, Jones et al, 2001]. The sequence
of this gene is defined by 4 cDNA clones
and 2 elements defined by RNA-seq, some from l4 (seen 2 times). We annotate structural defects or features
in 2 cDNA clones.
The gene contains 1 gt-ag intron
. Transcription produces one mRNA.
There are 6 articles
specifically referring to this gene in PubMed. In addition we point below
to 12 abstracts. This gene is associated to a phenotype
(BLIstered cuticle, SMAll body size). Proteins are expected to have molecular function
(structural constituent of cuticle). The gene interacts
The spliced mRNA putatively encodes a good protein
, containing domains
collagen triple helix repeat, nematode cuticle collagen, N-terminal [Pfam].
Please quote: AceView: a comprehensive cDNA-supported gene and transcripts annotation, Genome Biology 2006, 7(Suppl 1):S12
Map on chromosome II, links to other databases and other names
This gene bli-2 maps on chomosome II at position -1.02 (interpolated). In AceView, it covers 1.06 kb
, from 5652422 to 5651365 (WS190), on the reverse strand.
Links to: WormBase
The gene is also known in Wormgenes/AceView by its positional name 2F940, in Wormbase by its cosmid.number name F59E12.12.
Alternative mRNAs are shown aligned from 5' to 3' on a virtual genome where introns have been shrunk to a minimal length. Exon size is proportional to length, intron height reflects the number of cDNAs supporting each intron, the small numbers show the support of the introns in deep sequencing (with details in mouse-over) . Introns of the same color are identical, of different colors are different. 'Good proteins' are pink, partial or not-good proteins are yellow, uORFs are green. 5' cap or3' poly A flags show completeness of the transcript.
Mouse over the ending of each transcript gives tissues from which the supporting cDNAs were extracted. Details on tissue of origin for each intron and exon is available from the intron and exons table
Click on any transcript to open the specific mRNA page, to see the exact cDNA clone support and eventual SNPs and to get details on tissues, sequences, mRNA and protein annotations. Proteins supported by a single continuous cDNA sequence lead to underlining the name/ending of the variant. Names not underlined result from cDNA concatenation in the coding region and should be experimentally checked.
are depicted by broken lines; the height of the top of each intron reflects the relative number of clones supporting this intron. ]^[ A pink broken line
denotes an intron with standard boundaries (gt-ag or gc-ag) that is exactly supported (i.e. a cDNA sequence exactly matches the genome over 16 bp, 8 on both sides of the intron). ] ^ ] A blue broken line
denotes non-standard introns, exactly supported, but with non-standard at-ac or any other boundaries. ]-[ Pink
and ] - ] blue
straight lines represent 'fuzzy' introns of the standard and non-standard types respectively, those introns do not follow the 16 bp rule. Black straight lines ]-[denote gaps in the alignments.
Wide filled pink areas represent putative protein coding regions, narrow empty pink boxes represent the 5'UTR (on the left) and 3' UTR (on the right). Flags identify validated endings: cap site on the 5' side, polyadenylation site on the 3' side. Filled flags correspond to frequent events while empty flags have lesser supporting cDNAs (yet all are validated); at the 3' side, black flags are associated to the main AATAAA signal, blue flags
to any single letter variant of the main . More explanations are given in the gene help file