Molecular Phylogeny of Cryptophyte Algae
Summary
Cryptophyte algae constitute a distinctive lineage of unicellular eukaryotes characterised by the presence of a secondary plastid and a reduced endosymbiotic nucleus known as a nucleomorph. Molecular phylogenetic studies have revealed that cryptophytes diverged early from other photosynthetic protists, reflecting a complex evolutionary history shaped by multiple endosymbiotic events. Analyses of plastid and nuclear markers, including small subunit ribosomal RNA (SSU rRNA), ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit (rbcL) and internal transcribed spacer (ITS) regions, have elucidated the relationships among major genera such as Cryptomonas, Hemiselmis and Plagioselmis. These phylogenies have uncovered cryptic diversity, reassigned species boundaries and traced the loss of photosynthetic capacity in heterotrophic lineages. Beyond systematics, insights into cryptophyte evolution inform broader questions regarding plastid origin, algal bloom dynamics and biotechnological applications—ranging from pigment production to carbon sequestration. The global distribution of cryptophytes across marine and freshwater ecosystems underscores their ecological significance as primary producers and prey items in microbial food webs.
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Molecular Phylogeny of Cryptophyte Algae publication trend
The graph below shows the total number of articles in molecular phylogeny of cryptophyte algae across all publications each year (not limited to Nature Index journals).
Technical terms
Phylogeny: The evolutionary history and relationships among species or groups of organisms.
SSU rRNA: Small subunit ribosomal RNA gene commonly used as a molecular marker in phylogenetic reconstruction.
rbcL gene: A chloroplast gene encoding the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase, frequently employed in algal systematics.
Nucleomorph: A remnant nucleus of an algal endosymbiont retained within the plastid of secondary-endosymbiotic protists.
DNA barcoding: A method for species identification using short, standardised DNA regions that exhibit sufficient variability between species.
References
- Isolation of a widespread giant virus implicated in cryptophyte bloom collapse. The ISME Journal: Multidisciplinary Journal of Microbial Ecology (2024).
- Pitfalls of Establishing DNA Barcoding Systems in Protists: The Cryptophyceae as a Test Case. PLOS ONE (2012).
- Lineage-specific variations of congruent evolution among DNA sequences from three genomes, and relaxed selective constraints on rbcL in Cryptomonas (Cryptophyceae). BMC Ecology and Evolution (2005).
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