Centro de Biologia Molecular Severo Ochoa, C.S.I.C., Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid, Spain.
Published: January 2003
AI Article Synopsis
Article Abstract
In both sexes, the Drosophila genital disc comprises three segmental primordia: the female genital primordium derived from segment A8, the male genital primordium derived from segment A9 and the anal primordium derived from segments A10-11. Each segmental primordium has an anterior (A) and a posterior (P) compartment, the P cells of the three segments being contiguous at the lateral edges of the disc. We show that Hedgehog (Hh) expressed in the P compartment differentially signals A cells at the AP compartment border and A cells at the segmental border. As in the wing imaginal disc, cell lineage restriction of the AP compartment border is defined by Hh signalling. There is also a lineage restriction barrier at the segmental borders, even though the P compartment cells of the three segments converge in the lateral areas of the disc. Lineage restriction between segments A9 and A10-11 depends on factors other than the Hh, En and Hox genes. The segmental borders, however, can be permeable to some morphogenetic signals. Furthermore, cell ablation experiments show that the presence of all primordia (either the anal or the genital primordium) during development are required for normal development of genital disc. Collectively, these findings suggest that interaction between segmental primordia is required for the normal development of the genital disc.
Introduction: Oral mucosal grafts are essential in reconstructive urology, particularly for urethral and genital defects. Advances in harvesting and implantation techniques have been made, yet perioperative care remains crucial for optimal outcomes. This systematic review explores postoperative care pathways following oral mucosal graft harvesting to consolidate knowledge, identify best practices, and highlight research gaps.
Micro-computed tomography (micro-CT) is an X-ray-based technique that allows visualisation of the internal anatomy of insects in situ and does not require dissections. Traditionally, the study of insect anatomy has been mainly based on dissection techniques and microtome sections. However, micro-CT is becoming an increasingly widespread study technique.
The Laufeia clade is a unique group of jumping spiders that show rapid changes in male genital structures, specifically the embolic complex related to sperm transfer.
This study used advanced genetic analysis and morphological comparisons to better understand the evolutionary relationships and characteristics within this clade.
Findings suggest that habitat shifts from foliage to tree trunks may have driven the divergent evolution of these male genital features, providing a basis for future research in spider systematics and evolution.
Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Av. Universidad 2001, Chamilpa, Cuernavaca, Morelos, 62210, Mexico. Electronic address:
Hyperglycemia, the hallmark of diabetes mellitus (DM), is the main cause of DM-related systemic complications, including reproductive issues. Furthermore, the incidence of DM in males of reproductive ages is becoming an increasing concern, as the complexity of sperm capacitation (an essential process for fertilizing the egg) extends beyond conventional sperm parameters such as count, viability, and motility. Capacitation defects cause male infertility, and DM-related hyperglycemia may affect this process.
