Project description:Ossification of the ligamentum flava (OLF) is a common spinal disorder among the elderly that causes myelopathy and radiculopathy. Although studies have identified several genes that correlated with OLF, the underlying regulation network is far from clear. To identify transcriptional regulators for OLF, we compared the circRNAs expression of the ligamentum flava tissues from OLF patients and healthy volunteers through microarray analysis, which revealed a panel of circRNAs that were specifically regulated in ligament tissues of human undergoing ossification. To identify transcriptional regulators for OLF, we compared the circRNAs expression of the ligamentum flava tissues from OLF patients and healthy volunteers through microarray analysis.
Project description:Ossification of the ligamentum flava (OLF) is a common spinal disorder among the elderly that causes myelopathy and radiculopathy. Although studies have identified several genes that correlated with OLF, the underlying regulation network is far from clear. To identify transcriptional regulators for OLF, we compared the microRNA expression of the ligamentum flava tissues from OLF patients and healthy volunteers through microRNA sequencing.
Project description:Ossification of the ligamentum flava (OLF) is a common spinal disorder among the elderly that causes myelopathy and radiculopathy. Although studies have identified several genes that correlated with OLF, the underlying regulation network is far from clear. To identify transcriptional regulators for OLF, we compared the lncRNAs and mRNAs expression of the ligamentum flava tissues from OLF patients and healthy volunteers through microarray analysis, which revealed a panel of lncRNAs and mRNAs that were specifically regulated in ligament tissues of human undergoing ossification. To identify transcriptional regulators for OLF, we compared the lncRNAs and mRNAs expression of the ligamentum flava tissues from OLF patients and healthy volunteers through microarray analysis.
Project description:Evolutionary history of deuterostomes has remained unsolved and is intimately related to how chordates originated. Within the clade of deuterostomes, hemichordates and echinoderms (together called Ambulacraria) are sister groups of chordates; comparative studies among the three are insightful for understanding deuterostome evolution. Indirect-developing hemichordates, such as Ptychodera flava, develop into planktonic larvae, which are morphologically similar to echinoderm larvae, before metamorphosing into the adult body plan that retains an anteroposterior polarity homologous to that of chordates. Therefore, deciphering developmental programmes of indirect-developing hemichordates may provide a key for understanding the evolution of deuterostomes and chordate origins. Here, we characterise transcriptomes and chromatin accessibility across multiple developmental stages of P. flava and uncover biphasic developmental programmes controlled by different sets of transcription factors and their corresponding cis-regulatory elements. Transcriptome age and network analyses reveal that the gastrula transcriptome is relatively ancient and highly connected. By comparing developmental transcriptomes of hemichordate, sea urchin and amphioxus, a high conservation of gene expression during gastrulation is identified and extended to neurula stages of amphioxus, in addition to the highly similar larval transcriptomes among the three species. Moreover, P. flava possesses conserved interactions of transcription factors required for the development of echinoderm endomesoderm and chordate axial mesoderm. These results suggest a deuterostome phylotypic stage during gastrulation (corresponding to amphioxus gastrulation and neurulation) controlled by gene regulatory networks with conserved cis-regulatory interactions, and support the hypothesis that the deuterostome ancestor is an indirect-developer.
Project description:Evolutionary history of deuterostomes has remained unsolved and is intimately related to how chordates originated. Within the clade of deuterostomes, hemichordates and echinoderms (together called Ambulacraria) are sister groups of chordates; comparative studies among the three are insightful for understanding deuterostome evolution. Indirect-developing hemichordates, such as Ptychodera flava, develop into planktonic larvae, which are morphologically similar to echinoderm larvae, before metamorphosing into the adult body plan that retains an anteroposterior polarity homologous to that of chordates. Therefore, deciphering developmental programmes of indirect-developing hemichordates may provide a key for understanding the evolution of deuterostomes and chordate origins. Here, we characterise transcriptomes and chromatin accessibility across multiple developmental stages of P. flava and uncover biphasic developmental programmes controlled by different sets of transcription factors and their corresponding cis-regulatory elements. Transcriptome age and network analyses reveal that the gastrula transcriptome is relatively ancient and highly connected. By comparing developmental transcriptomes of hemichordate, sea urchin and amphioxus, a high conservation of gene expression during gastrulation is identified and extended to neurula stages of amphioxus, in addition to the highly similar larval transcriptomes among the three species. Moreover, P. flava possesses conserved interactions of transcription factors required for the development of echinoderm endomesoderm and chordate axial mesoderm. These results suggest a deuterostome phylotypic stage during gastrulation (corresponding to amphioxus gastrulation and neurulation) controlled by gene regulatory networks with conserved cis-regulatory interactions, and support the hypothesis that the deuterostome ancestor is an indirect-developer.