Mouse anti-Human SIX3 monoclonal antibody, clone 4E23

During embryogenesis the sea urchin early pluteus larva differentiates 40-50 neurons marked by expression of the panneural marker synaptotagmin B (SynB) that are distributed along the ciliary band, in the apical plate and pharyngeal endoderm, and 4-6 serotonergic neurons that are confined to the apical plate. Development of all neurons has been shown to depend on the function of Six3. Using a combination of molecular screens and tests of gene function by morpholino-mediated knockdown, we identified SoxC and Brn1/2/4, which function sequentially in the neurogenic regulatory pathway and are also required for the differentiation of all neurons. Misexpression of Brn1/2/4 at low dose caused an increase in the number of serotonin-expressing cells and at higher dose converted most of the embryo to a neurogenic epithelial sphere expressing the Hnf6 ciliary band marker. A third factor, Z167, was shown to work downstream of the Six3 and SoxC core factors and to define a branch specific for the differentiation of serotonergic neurons. These results provide a framework for building a gene regulatory network for neurogenesis in the sea urchin embryo.

Glycated haemoglobin (HbA(1c)) is widely used as a biomarker for the diagnosis of diabetes, for population-level screening, and for monitoring the glycaemic status during medical treatment. Although the heritability of HbA(1c) has been estimated at similar to 55-75%, a much smaller proportion of phenotypic variance is explained by the HbA(1c)-associated variants identified so far. To search for novel loci influencing the HbA(1c) levels, we conducted a genome-wide meta-analysis of 2 non-diabetic Japanese populations (n = 7,704 subjects in total). We identified 2 novel loci that achieved genome-wide significance: TMC6-TMC8 (P = 5.3 x 10(-20)) and SIX3-SIX2 (P = 8.6 x 10(-9)). Data from the largest-scale European GWAS conducted for HbA(1c) supported an association between the novel TMC6-TMC8 locus and HbA1c (P = 2.7 x 10(-3)). The association analysis with glycated albumin and glycation gap conducted using our Japanese population indicated that the TMC6-TMC8 and SIX3-SIX2 loci may influence the HbA1c level through non-glycaemic and glycaemic pathways, respectively. In addition, the pathwaybased analysis suggested that the linoleic acid metabolic and 14-3-3-mediated signalling pathways were associated with HbA(1c). These findings provide novel insights into the molecular mechanisms that modulate the HbA(1c) level in non-diabetic subjects.