biology16.7 min read
Clone-ception Hits a Wall: Infinite Cloning Isn’t Feasible
17 days ago•Source: Gizmodo
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10.365 min•21 days ago
Jellyfish Hints at a 20-Hour Clock Beyond Traditional Clock Genes
A newly described hydrozoan jellyfish species off Japan keeps a self-sustained 20-hour cycle that governs sunset spawning, suggesting an alternate, non-traditional circadian mechanism that evolved without standard clock genes.
16.61 min•24 days ago
Adults Are the Primary Predator of Baby Blue Crabs in Chesapeake Bay
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Fungus Nucleates Ice at Near-Freezing Temps
Gizmodo•25 days ago
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Transient GPCR states reveal how NTSR1 chooses its G proteins
Nature•1 month ago
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Disorder Rules the Nuclear Pore’s Dynamic Gate
New high-speed imaging and modeling show the nuclear pore’s center is a dynamic, disorder‑driven environment where FG‑nucleoporins and transport proteins form a moving central plug; this flexible 'virtual gate' controls which molecules enter the nucleus, challenging the idea of a static gel and linking pore dysfunction to disease, with implications for drug delivery.
Structure-Powered Expansion of Eukaryote-Like Toolkit in Asgard Archaea
A large-scale structural analysis of 936 Asgard archaeal genomes using ColabFold and protein language models identified 1,319 novel isomorphic ESPs (iESPs) and organized them into 908 structural clusters, greatly expanding the repertoire of eukaryotic-like proteins in Asgard archaea. The iESPs are enriched in information storage/processing and cellular signaling, including components related to the vault (MVP) and Commander (COMMD) complexes, suggesting a higher degree of eukaryote-like cellular complexity in the archaeal ancestor of eukaryotes. The study also reveals patchy distributions and emphasizes that structural similarity, not just sequence similarity, drives annotation, highlighting the value of structure-based approaches for tracing deep evolutionary connections. The findings support a more nuanced view of eukaryogenesis and provide a methodological blueprint for uncovering distant homologues in non-model organisms.
Salt cycles drive mixed clonal-aggregative multicellularity in a choanoflagellate
Researchers show Choanoeca flexa forms multicellular sheets clonally, via aggregation, or through a mix—clonal-aggregative multicellularity—driven by evaporation–refilling salinity cycles in Curaçao splash pools. Low salinity supports both cell division and aggregation to build sheets, while hypersalinity triggers dissociation into desiccation‑resistant cysts that can rehydrate into sheets. Aggregation is active, requires living cells, and exhibits kin recognition and species specificity; density and salinity shift the balance between clonal and aggregative modes. Genomic analyses identify candidate kin‑recognition loci. Together, the findings reveal a flexible, environmentally entrained route to multicellularity, expanding our understanding of choanoflagellate biology and potential premetazoan life histories.
Pre-ZGA 3D genome architecture emerges modularly in Drosophila embryos
Using Pico-C, a low-input Micro-C method, the study maps high-resolution 3D genome architecture across NC9–NC14 in early Drosophila embryos and reveals that chromatin loops and boundaries emerge in an ordered, modular fashion before major ZGA. Transcriptional elongation inhibition preserves some early loops but weakens promoter insulation, while sequence-based models show orthogonal motif-driven contributions to architecture. Co-depleting Zelda and GAF confirms locus-specific regulatory inputs, supporting a layered regulatory logic for genome establishment prior to ZGA.
Death-Resistant Cells Drive Regeneration, Linking Wound Repair to Cancer Risk
A Weizmann Institute study reveals that a subset of cells can survive radiation by keeping caspases from completing cell death, called DARE cells, which promote tissue regeneration via compensatory proliferation; their death-resistant descendants may contribute to cancer relapse, but neighboring NARE cells form a negative feedback loop to limit overgrowth.
Tiny llama nanobodies lock coronavirus spike to block infection across variants
Researchers identified llama-derived single-domain antibodies (nanobodies) that bind a conserved base region (S2) of the coronavirus spike and act like a clamp, locking the spike in its original shape and preventing the conformational changes needed for cell entry. In animal tests these nanobodies provided strong protection at low doses and showed a high barrier to viral escape, neutralizing a broad range of SARS-related coronaviruses and offering potential for long-lasting antiviral therapies resilient to future variants.
Embryo Cell Division Driven by Mechanical Ratchet, Not a Full Contractile Ring
Researchers from the Brugués group at TU Dresden report in Nature a new mechanism for early embryonic cell division in yolk-rich cells: a mechanical ratchet that drives division without a fully closed actin contractile ring. By showing microtubule asters stiffen the cytoplasm during interphase and the cytoplasm becomes more fluid in M-phase, they find the actin band can ingress across multiple cell cycles, anchored by microtubules and re-stabilized when the cytoplasm stiffens again. This challenges textbook models and may apply broadly to yolk-rich embryos across species.
TimeVaults give cells a memory of their gene activity
Researchers rewired vault proteins to create TimeVaults that capture and store messenger RNA produced by human cells over a 24-hour window, keeping a record for at least a week. The system acts as an unbiased cellular memoir of transcription, activated by a drug cue and reversible, and could shed light on cancer drug resistance and stem-cell biology without noticeably affecting cell behavior.
Widespread Presence of Persistent Lytic Phages in Bacterial Genomes
A large-scale genomic analysis revealed over 100,000 complete lytic phages embedded within bacterial genomes across diverse species and environments, challenging traditional phage classification and highlighting their potential in therapy and ecology. The study identified new phage lineages, expanded known groups, and found therapeutic phages naturally present in bacterial populations, suggesting a broader and more dynamic phage-bacteria interaction than previously understood.
NAC Regulates Nascent Chain Fate via Tunnel Sensing and Chaperone Activity
The study reveals that the nascent polypeptide-associated complex (NAC) plays a multifaceted role in protein synthesis by coordinating translation, folding, and targeting through sequence-specific interactions both inside and outside the ribosome tunnel, including an intra-tunnel sensing mechanism that influences translation kinetics and proteostasis.