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Gene Evolution - Fast or Slow?

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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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Accelerating snail vector genomics.

Tom Pennance1, David Rollinson2,3

  • 1College of Osteopathic Medicine of the Pacific - Northwest, Western University of Health Sciences, Lebanon, OR, USA.

Infectious Diseases of Poverty
|May 6, 2024
PubMed
Summary
This summary is machine-generated.

Genomic data for key snail hosts (Bulinus, Biomphalaria, Oncomelania) is now publicly available. This advances understanding of snail-schistosome interactions for schistosomiasis control.

Keywords:
BiomphalariaBulinusOncomelaniaGenomicsSnail vectors

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Area of Science:

  • Genomics
  • Parasitology
  • Infectious Disease Research

Background:

  • Schistosomiasis is transmitted by three main snail genera: Bulinus, Biomphalaria, and Oncomelania.
  • These genera host the causative agents of human schistosomiasis: Schistosoma haematobium, S. mansoni, and S. japonicum.
  • Recent publications provide chromosome-level genome assemblies for these critical snail vectors.

Discussion:

  • The availability of genomes from Bulinus, Biomphalaria, and Oncomelania species across Africa, South America, and Asia is a significant advancement.
  • This includes the first genomes of African snail vectors (Biomphalaria sudanica, Bi. pfeifferi, Bulinus truncatus) and high-quality assemblies for South American Bi. glabrata.
  • The newly available genomic and transcriptomic data are crucial for understanding snail-parasite compatibility.

Key Insights:

  • The data facilitates the identification of molecular mechanisms underlying snail-schistosome interactions.
  • Understanding these host-parasite relationships is key to developing targeted control strategies.
  • This resource enables research into the specific genetic factors influencing parasite development and transmission.

Outlook:

  • The comprehensive genomic data will stimulate further research into snail biology and schistosome infection.
  • This is expected to lead to novel interventions for schistosomiasis transmission control.
  • Future strategies may focus on disrupting the identified molecular targets dictating host-parasite interactions.