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Related Concept Videos

Cis-regulatory Sequences02:02

Cis-regulatory Sequences

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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Gene Regulatory Network Inference from Pseudotime-Ordered scRNA-seq Data via Time-Lagged Divergence Measures.

Lingling Zhang1, Tong Si2, Lucas Koch3

  • 1Department of Mathematics, State University of New York at Brockport, Brockport, NY, USA.

Bioinformatics Research and Applications : ... International Symposium, ISBRA ... Proceedings. ISBRA (Conference)
|January 5, 2026
PubMed
Summary

We developed PseudoGRN, a new method to build gene regulatory networks (GRNs) from single-cell RNA sequencing (scRNA-seq) data. This tool helps understand dynamic gene regulation in complex biological systems.

Keywords:
Applied Computing → BioinformaticsGene Regulatory NetworkIntegral Probability MetricPartial CorrelationPseudotime Analysisf-DivergencescRNA-seq Data

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Area of Science:

  • Computational Biology
  • Genomics
  • Systems Biology

Background:

  • Inferring gene regulatory networks (GRNs) from time-series single-cell RNA sequencing (scRNA-seq) data presents significant challenges.
  • These challenges include sparse temporal resolution, high dimensionality, and inherent cellular heterogeneity.

Purpose of the Study:

  • To develop a novel integrative framework, PseudoGRN, for reconstructing directed GRNs from time-series scRNA-seq data.
  • To address limitations of existing methods in capturing dynamic regulatory mechanisms.

Main Methods:

  • PseudoGRN unifies multiple pseudotime inference methods.
  • It incorporates various time-lagged divergence measures and non-redundant penalized network inference.
  • Partial correlation analysis is employed for robust GRN reconstruction.

Main Results:

  • PseudoGRN demonstrated superior performance compared to existing approaches when applied to a real-world scRNA-seq dataset.
  • The method successfully reconstructed directed GRNs from complex time-series scRNA-seq data.
  • It provided a robust and interpretable tool for analyzing dynamic regulatory mechanisms.

Conclusions:

  • PseudoGRN offers an advanced solution for inferring cell type-specific GRNs from time-series scRNA-seq data.
  • The framework enhances our ability to uncover dynamic regulatory mechanisms in single-cell systems.
  • It represents a significant advancement in computational biology for analyzing scRNA-seq data.