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Open research questions in Developmental Biology and Gene Regulation

75 unresolved questions extracted from the limitations and future-work sections of 537 Developmental Biology and Gene Regulation papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Although patterning is orchestrated by gene regulatory networks (GRNs) activated by morphogens, how GRN dynamics interact with growth is not understood.

    Gene Regulatory Networks Mediate Pattern Scaling in Growing Tissues · 2026 · DOI

  • Despite cellular-level changes, JH treatment did not restore overall gut size, indicating that the 72-84 hour exposure window was insufficient for subsequent tissue hypertrophy.

    The Role of Juvenile Hormone in Midgut Remodeling During Drosophila melanogaster Diapause · 2026 · DOI

  • Juvenile Hormone (JH) promotes ISC proliferation under favorable conditions, but its capacity to modulate stem cell dynamics during cold-induced diapause remains unclear.

    The Role of Juvenile Hormone in Midgut Remodeling During Drosophila melanogaster Diapause · 2026 · DOI

  • Finally, some of the tested regulatory elements may have a repressive function, something our MPRA design is insufficiently powered to detect due to the low…

    <i>In vitro</i> massively parallel screening of human regulatory elements involved in postcranial skeletal development for differential activity compared to chimpanzee. · 2026 · DOI

  • Inositol phosphates (InsPs) and inositol pyrophosphates (PP-InsPs) are key regulators of cellular signaling and metabolism, yet developmental changes in the InsP/PP-InsP network in eukaryotic systems remain poorly understood.

    The dynamic inositol phosphate network during development in Drosophila melanogaster · 2026 · DOI

  • While programmed SCR is rare in mammals, it appears remarkably widespread in insects, yet its regulation and biological significance remain poorly understood.

    Regulatory landscape of widespread stop codon readthrough in Drosophila · 2026 · DOI

  • The flat, stacked cells of the terminal filament (TF) form a specialized somatic structure positioned at the anterior end of ovarioles in virtually all insect ovaries, but physiological roles TFs play in adult ovaries remain little known.

    The Drosophila ovarian terminal filament imports lipophilic molecules that support cyst and follicle development within the ovariole · 2026 · DOI

  • How can a conserved network orchestrate precise local outcomes across a wide array of developmental and ecological contexts during evolution? Flexible subcellular compartmentalization of multivalent proteins is a powerful, but understudied, driver of dynamic modularity in regulatory networks, defining an architecture in which context-sensing bridges between distributed subnetworks allow simultaneous access to alternative regulatory states.

    Subcellular compartmentalization expands the regulatory repertoire of a conserved developmental network · 2026 · DOI

  • However, the origin and drivers of this coordinated expression remain elusive: while vertebrates rely on complex cluster-wide Hox gene regulation3-8, insects define gene-specific, sub-cluster regulatory domains9-11.

    Convergent evolution of cluster-wide Hox gene regulation in Bilateria · 2026 · DOI

  • Left-right (LR) asymmetry is a fundamental feature of animal development, yet progress in understanding its establishment has been limited by the fact that almost all animals exhibit invariant chirality.

    An ancient polymorphism in myosin I a/b determines the left-right asymmetry of Japanese snails · 2026 · DOI

  • These results broaden the known molecular repertoire underlying LR asymmetry, suggest key mutations and positions that should be explored in other model animals, and highlight snails as a powerful model for understanding the origins of animal LR asymmetry.

    An ancient polymorphism in myosin I a/b determines the left-right asymmetry of Japanese snails · 2026 · DOI

  • While PCP mechanisms are well characterized in continuous epithelial tissues, whether PCP-dependent polarity propagation can operate across discontinuous neuronal structures remains unclear.

    PCP-dependent polarity propagation across neuronal columns in the Drosophila medulla · 2026 · DOI

  • The functions of these chemosensors on wild type wings is not fully understood but roles in pheromone sensing [48] and grooming activities [49] induced by bacterial chemicals have been identified for some of them.

    Functions of Uninflatable in the Drosophila melanogaster wing and notum · 2026 · DOI

  • Integration of paleontological fossil data (from Panderichthys, Tiktaalik, and Elpistostege) with molecular-level mechanistic studies of appendage development in living sarcopterygians requires explicit functional validation of how specific morphological features observed in fossils (partial dermal fin ray reduction, dorso-ventral specification) relate to underlying genetic regulatory changes.

    Evolutionary pathway and genetic mechanisms of fin-to-limb transition in vertebrates · 2026 · DOI

  • The biserial organization of lungfish fins and their regulatory gene expression patterns suggest ancestral tetrapod limb developmental programs were present in the last common ancestor of sarcopterygians, but comparative genomic studies characterizing enhancer elements and transcriptional networks in lungfish appendages versus tetrapod limbs are lacking.

    Evolutionary pathway and genetic mechanisms of fin-to-limb transition in vertebrates · 2026 · DOI

  • The evolutionary modifications of regulatory networks controlling digit patterning (specifically Hox signaling, Shh-Gli3 ZPA, and Fgf AER modules) remain incompletely understood. Direct functional testing of these conserved regulatory modules in phylogenetically pivotal extant groups (lungfishes, Protopterus annectens) using CRISPR or morpholino knockdown is needed to determine which network modifications were essential for digit formation.

    Evolutionary pathway and genetic mechanisms of fin-to-limb transition in vertebrates · 2026 · DOI

  • The developmental mechanisms underlying autopod emergence have not been fully characterized. Functional developmental studies combining gene knockout experiments with in vivo imaging in lungfishes and coelacanths are needed to determine how endoskeletal expansion and dermal fin ray reduction are coordinated during sarcopterygian appendage development.

    Evolutionary pathway and genetic mechanisms of fin-to-limb transition in vertebrates · 2026 · DOI

  • The precise homology of distal skeletal elements between fins and limbs remains unresolved and actively debated. Comparative morphological analysis across phylogenetically pivotal taxa (cartilaginous fishes, lungfishes, and tetrapodomorphs) needs systematic integration with 3D skeletal imaging to establish definitive homologies between fin rays and digit structures.

    Evolutionary pathway and genetic mechanisms of fin-to-limb transition in vertebrates · 2026 · DOI

  • Studies in vertebrate systems have shown that FGFR signaling plays a crucial role in regulating glial morphogenesis (Furusho et al., 2011; Furusho et al., 2012; Meier et al., 2014; Kang et al., 2014). This appears to be the case in Drosophila as well: FGFR/Htl signaling is found to regulate organization, morphology and plasticity in most classes of glia across developmental stages (Shishido et al., 1997; Avet-Rochex et al., 2012; Stork et al., 2014; Ayoub et al., 2023). On the other hand, little is known of how G-protein signaling pathways regulate glial morphology. Much of our understanding comes from studies on Moody which is limited to SPGs. However, studies on Loco, Fog and Tre-1 (Granderath et al., 1999; Schwabe et al., 2005; Ratnaparkhi and Zinn, 2007; Shweta et al., 2021; Chen et al., 2024; Katagade et al., 2024) indicate that GPCR signaling is likely to have a broader role in regulating glial morphogenesis which needs to be explored further. In this context, the interaction between Fog and FGFR/Htl in regulating glial organization (Shweta et al., 2021) is significant especially given the conserved role of FGFR in glial morphogenesis. It would be interesting to determine if the interaction between the two pathways (GPCR and FGFR/Htl) is conserved and hierarchical in other glia as well.

    Regulating glial morphogenesis: insights from Drosophila · 2026 · DOI

  • The role of PaxA in cnidocyte development among hydrozoans has not been studied, but the conserved role of SoxB2 in regulating the fate of a progenitor cell that gives rise to neurons and cnidocytes in Nematostella and Hydractinia echinata suggests that this SoxB2/PaxA pathway may well be conserved across cnidarians.

    PaxA, but not PaxC, is required for cnidocyte development in the sea anemone Nematostella vectensis · 2017 · DOI

  • As was shown previously in other phyla Pdu-Meis/hth and Pdu-Pbx1/exd are co-expressed, although the expression is not limited to the proximal part of the parapodia.

    Formation of body appendages during caudal regeneration in Platynereis dumerilii: adaptation of conserved molecular toolsets · 2016 · DOI

  • In contrast to the evidence for conserved microvillar structure in sponges and vertebrates, we found that choanoflagellates and ctenophores lack homologs of many fundamental microvillar genes, suggesting that microvillar structure may diverge significantly in these lineages, warranting further study.

    Conserved expression of vertebrate microvillar gene homologs in choanocytes of freshwater sponges · 2016 · DOI

  • HOX genes are good candidates to regulate planarian spatial patterning, yet the full complement or genomic clustering of planarian HOX genes has not yet been described, primarily because only a few have been detectable by in situ hybridization, and none have given morphological phenotypes when knocked down by RNAi.

    HOX gene complement and expression in the planarian Schmidtea mediterranea · 2016 · DOI

  • 1116 The role of Meckel's cartilage in mammalian mandibular bone formation and even basic information on the migratory patterns and differentiative fates of mammalian neural crest cells are not well understood.

    Interaction between The Neural Crest and Extracellular Matrix Proteins in Craniofacial Skeletogenesis · 1990 · DOI

  • The results of this study identify the most promising genes for further investigation of their role in the signal transduction that triggers regeneration.

    Expression of Growth Factor Genes in the Body Wall of the Holothurian <i>Eupentacta fraudatrix</i> During Regenerative Processes · 2026 · DOI

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75 open questions have been extracted from the limitations and future-work passages of 537 Developmental Biology and Gene Regulation papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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