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Related Concept Videos

Multi-species Conserved Sequences02:51

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Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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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Ultraconserved Non-coding DNA Within Diptera and Hymenoptera.

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Summary
This summary is machine-generated.

Ultraconserved non-coding elements (uCSBs) were identified across diverse insect groups, including flies, mosquitoes, ants, and bees. These conserved sequences play a crucial role in gene regulation and enhancer function.

Keywords:
EnhancersEvoPrinterUltraconserved non-coding sequences

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Genomic sequences of flies, mosquitoes, ants, and bees are now available.
  • Understanding conserved non-coding elements is key to deciphering gene regulation.

Purpose of the Study:

  • To identify ultraconserved sequence elements (uCSBs) in Diptera and Hymenoptera.
  • To analyze the evolutionary origin and function of conserved non-coding sequences.

Main Methods:

  • Phylogenetic footprinting using the EvoPrinter program.
  • Comparative analysis of non-coding sequences flanking developmental genes across species.

Main Results:

  • Many conserved sequence blocks (CSBs) in Drosophila cis-regulatory DNA are conserved in other flies (Ceratitis, Musca).
  • Ultraconserved CSBs (uCSBs) were found to be conserved in position, though not always orientation, relative to genes.
  • uCSBs were identified among distantly related mosquito species and shared between ants and bees.

Conclusions:

  • The study successfully detected uCSBs in Diptera and Hymenoptera using EvoPrinter.
  • Analysis of uCSBs aids in understanding the evolutionary origin and function of conserved non-coding sequences.
  • These findings can help discover core elements of enhancers and gene regulatory mechanisms.