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Red Algae01:23

Red Algae

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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Green Algae01:21

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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
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The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression
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Life-cycle-related gene expression patterns in the brown algae.

Pélagie Ratchinski1, Olivier Godfroy2, Benjamin Noel3

  • 1Sorbonne Université, CNRS, Algal Genetics Group, Integrative Biology of Marine Models Laboratory, Roscoff, France.

Elife
|November 19, 2025
PubMed
Summary
This summary is machine-generated.

Brown algae exhibit conserved gene expression patterns throughout their life cycles. This study reveals shared molecular features between gametophyte and sporophyte generations across diverse species, aiding understanding of brown algal development.

Keywords:
Dictyota dichotomabrown algaeearly developmentectocarpus species 7gene clusteringlife cycleplant biology

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Area of Science:

  • Marine Biology
  • Developmental Biology
  • Genomics

Background:

  • Brown algae are crucial marine ecosystem components with complex life cycles.
  • Molecular mechanisms driving brown algal development and life cycle progression are not well understood.

Purpose of the Study:

  • To investigate conserved gene expression patterns related to development and life cycle progression in brown algae.
  • To compare transcriptomic data across diverse brown algal species and life stages.

Main Methods:

  • Comparative transcriptomics of gametophyte and sporophyte stages in 10 brown algal species.
  • Analysis of gene ontology terms for generation-biased/specific genes.
  • Time-series transcriptomic analysis of *Ectocarpus* and *Dictyota dichotoma* life cycles.

Main Results:

  • The number of generation-biased genes correlated with life cycle dimorphism.
  • Conserved gene ontology terms indicate shared life-cycle features between generations.
  • Early sporophyte development in *Ectocarpus* shows distinct transcriptome shifts.
  • Co-expressed gene modules are conserved between *Ectocarpus* and *Dictyota dichotoma*.

Conclusions:

  • Identified broad, conserved patterns of gene expression related to life cycle and development across brown algae.
  • Highlights conserved functional categories and co-expressed gene modules, suggesting evolutionary stability in developmental pathways.