Sequence, gene structure, and expression pattern of CTNNBL1, a minor-class intron-containing gene - Evidence for a role in apoptosis

Department of Anatomy, Case Western Reserve University, Cleveland, OH 44106, USA.
Genomics (Impact Factor: 2.28). 03/2003; 81(3):292-303. DOI: 10.1016/S0888-7543(02)00038-1
Source: PubMed


We have identified and characterized a cDNA designated CTNNBL1 (catenin (cadherin-associated protein), beta-like 1) coding for a protein of 563 amino acids having predicted structural homology to beta-catenin and other armadillo (arm) family proteins. CTNNBL1 is expressed in multiple human tissues, and its sequence is conserved across widely divergent species. The human CTNNBL1 gene on chromosome 20q11.2 contains 16 exons spanning > 178 kb. Intron 4 is a minor-class intron bearing AT at the 5' splice site and AC at the 3' splice site. An acidic domain, as well as a putative bipartite nuclear localization signal, a nuclear export signal, a leucine-isoleucine zipper, and phosphorylation motifs are present in the protein sequence. Transient expression of CTNNBL1 in CHO cells results in localization to the nucleus and apoptosis. The rate of cell death was higher when cells were transfected with a carboxy-terminal fragment of CTNNBL1, suggesting that the apoptosis-inducing activity is a function of this region.

1 Read
  • Source
    • "The link between FDFT1, CTNNBL1 and obesity is fairly unknown. FDFT1 encodes the enzyme catalysing the first step of cholesterol synthesis [26], whereas CTNNBL1 encodes a protein homolog to β-catenin responsible for cell-to-cell adhesion and Wnt-signalling [27-29]. Expression profiles in the human protein atlas show that FDFT1 predominantly is expressed in the colon, whereas CTNNBL1 is ubiquitously expressed. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A genome-wide scan in unrelated US Caucasians identified rs7001819 upstream of farnesyl-diphosphate farnesyltransferase 1 (FDFT1) and multiple variants within catenin (cadherin-associated protein), beta-like 1 (CTNNBL1) to associate strongly with body mass index (BMI). The most significantly associating variants within CTNNBL1 including rs6013029 and rs6020846 were additionally confirmed to associate with morbid obesity in a French Caucasian case-control sample. The aim of this study was to investigate the impact of these three variants on obesity, through analyses of obesity-related quantitative traits, and case-control studies in large study samples of Danes. The FDFT1 rs7001819, CTNNBL1 rs6013029 and rs6020846 were genotyped, using TaqMan allelic discrimination, in a combined study sample comprising 18,014 participants ascertained from; the population-based Inter99 cohort (n = 6,514), the ADDITION Denmark screening study cohort (n = 8,662), and a population-based sample (n = 680) and a type 2 diabetic patients group (n = 2,158) from Steno Diabetes Center. Both CTNNBL1 variants associated with body weight and height with per allele effect sizes of 1.0 [0.3-0.8] kg and 0.6 [0.2-0.9] cm, respectively, for the rs6020846 G-allele. No association was observed with BMI and waist circumference. In case-control studies neither of the CTNNBL1 variants showed association with overweight, obesity or morbid obesity (rs6013029: Odds Ratio (OR)(overweight) = 1.02 [0.90-1.16], OR(obesity) = 1.09 [0.95-1.25], OR(morbidobesity) = 1.26 [0.91-1.74]; rs6020846: OR(overweight) = 1.05 [0.93-1.18], OR(obesity) = 1.13 [1.00-1.28], OR(morbidobesity) = 1.17 [0.86-1.61]). However, in meta-analyses of the present and the previous study, both the rs6013029 T-allele and the rs6020846 G-allele increased the risk of developing morbid obesity (rs6013029: OR(combined) = 1.36 [1.12-1.64], p = 0.002; rs6020846: OR(combined) = 1.26 [1.06-1.51], p = 0.01), and obesity (rs6013029: OR(combined) = 1.17 [1.04-1.31], p = 0.007; rs6020846: OR(combined) = 1.17 [1.05-1.30], p = 0.004). The FDFT1 rs7001819 C-allele showed no association with obesity-related quantitative measures or dichotomous measures of overweight, obesity and morbid obesity. CTNNBL1 variants associated with body weight and height, and confer the risk of developing obesity in meta-analyses combining the present and a previous study. FDFT1 rs7001819 showed no association with obesity, neither when analysing quantitative traits nor when performing case-control studies of obesity.
    Full-text · Article · Mar 2009 · BMC Medical Genetics
  • Source
    • "EST #58 showed 96% identity with a putative nuclear protein from Oryza sativa (Table 1), as well as with an EST isolated from an embryo library of Hordeum vulgare (accession number A143619). In particular, our cDNA fragment shared 77% identity (e-value of 2e À 04) with the CTNNBL1 (catenin caderin-associated protein blike 1, Jabbour et al., 2003) gene of Homo sapiens (accession number AAH36739), which encodes for a protein having predicted structural homology with b-catenin and other armadillo (arm) family proteins. This gene was designated PpArmadillolike (PpARM). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The essential feature of apomixis is that an embryo is formed autonomously by parthenogenesis from an unreduced egg of an embryo sac generated through apomeiosis. The genetic constitution of the offspring is, therefore, usually identical to the maternal parent, a trait of great interest to plant breeders. If apomixis were well understood and harnessed, it could be exploited to indefinitely propagate superior hybrids or specific genotypes bearing complex gene sets. A fundamental contribution to the understanding of the genetic control of the apomictic pathway could be provided by a deep knowledge of molecular mechanisms that regulate the reproductive events. In Poa pratensis the cDNA-AFLP method of mRNA profiling allowed us to visualize a total of 2248 transcript-derived fragments and to isolate 179 sequences that differed qualitatively or quantitatively between apomictic and sexual genotypes at the time of flowering when the primary stages of apomixis occur. Three ESTs were chosen for further molecular characterization because of their cDNA-AFLP expression pattern and BLAST information retrieval. The full-lengths of the newly isolated genes were recovered by RACE and their temporal expression patterns were assessed by RT-PCR. Their putative role in cell signaling transduction cascades and trafficking events required during sporogenesis, gametogenesis and embryogenesis in plants is reported and discussed.
    Full-text · Article · Dec 2005 · Plant Molecular Biology
  • Source
    • "AAK27389.1). Recently, this protein has been renamed CT- NNBL1, and, of interest, it has been found to induce apoptosis when expressed in Chinese hamster ovary cells (Jabbour et al., 2003). Our data suggest that this protein also has an important role as a negative regulator of cell death at least in Xenopus development. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The diploid frog X. tropicalis has recently been adopted as a model genetic system, but loss-of-function screens in Xenopus have not yet been performed. We have undertaken a pilot functional knockdown screen in X. tropicalis for genes involved in nervous system development by injecting antisense morpholino (MO) oligos directed against X. tropicalis mRNAs. Twenty-six genes with primary expression in the nervous system were selected as targets based on an expression screen previously conducted in X. laevis. Reproducible phenotypes were observed for six and for four of these, a second MO gave a similar result. One of these genes encodes a novel protein with previously unknown function. Knocking down this gene, designated pinhead, results in severe microcephaly, whereas, overexpression results in macrocephaly. Together with the early embryonic expression in the anterior neural plate, these data indicate that pinhead is a novel gene involved in controlling head development.
    Full-text · Article · Feb 2004 · Developmental Dynamics
Show more