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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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The Intermediate Value Theorem is a foundational result in calculus that guarantees the existence of solutions within certain intervals for continuous functions. Formally, the Intermediate Value Theorem states that if a function f is continuous on the closed interval [a, b], and if N is any value between f(a) and f(b), then there exists at least one c ∈ (a, b) such that f(c) = N. This theorem is instrumental in proving the existence of roots and in analyzing the behavior of continuous...
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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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Isolation and Direct Neuronal Reprogramming of Mouse Astrocytes
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Early Reprogramming Intermediates Enable Direct Neuronal Conversion Via NGN2.

Silvia Angiolillo1,2, Wei Qin1,2, Alessia Gesualdo1,2

  • 1Department of Industrial Engineering, University of Padua, Padua, Italy.

Journal of Molecular Neuroscience : MN
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

Accelerate neurological disease modeling by partially reprogramming human fibroblasts. Just 3 days of reprogramming factors allows fibroblasts to efficiently transdifferentiate into neurons using Neurogenin-2 (NGN2).

Keywords:
IPSC direct conversionInduced neuronsNGN2Neural differentiationReprogramming intermediateTransient reprogramming-programming

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Area of Science:

  • Neuroscience
  • Stem Cell Biology
  • Disease Modeling

Background:

  • Human induced pluripotent stem cells (hiPSCs) are used for neuronal models.
  • hiPSC differentiation into neurons is time-consuming.
  • Faster methods are needed for neurological disease modeling.

Purpose of the Study:

  • To investigate if partial reprogramming of fibroblasts can accelerate neuronal differentiation.
  • To determine the optimal reprogramming stage for efficient neuronal conversion.
  • To utilize single-cell transcriptomics to understand reprogramming dynamics.

Main Methods:

  • Partial reprogramming of human fibroblasts using reprogramming factors for 3 days.
  • Overexpression of Neurogenin-2 (NGN2) to induce neuronal transdifferentiation.
  • Single-cell RNA sequencing to analyze cell populations during reprogramming.

Main Results:

  • Transient reprogramming for 3 days enables NGN2-mediated neuronal conversion.
  • Three distinct intermediate cell populations were identified during reprogramming.
  • Neuronal conversion efficiency correlates with the reprogramming stage.

Conclusions:

  • Partial reprogramming of fibroblasts is a faster alternative to hiPSCs for neuronal modeling.
  • NGN2 can efficiently induce neuronal fate in partially reprogrammed fibroblasts.
  • Understanding reprogramming intermediates aids in optimizing neuronal differentiation protocols.