What question did this study set out to answer?

To determine whether the deep-branching eukaryotic protist Giardia lamblia contains spliceosomal introns and the molecular machinery required for RNA splicing.

February 19, 2002Proceedings of the National Academy of SciencesOpen Access

A spliceosomal intron in Giardia lamblia

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Authors

JNJulie NixonUniversity of Edinburgh AWAmy WangUniversity of Technology Sydney HMHilary G. MorrisonMarine Biological Laboratory

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Implication

Genomic analysis uncovers a spliceosomal intron and splicing machinery in Giardia lamblia, indicating that introns emerged prior to the divergence of early eukaryotic lineages.

Key Points

To determine whether the deep-branching eukaryotic protist Giardia lamblia contains spliceosomal introns and the molecular machinery required for RNA splicing.
Screened the Giardia lamblia genome for intervening sequences in protein-coding genes.
Characterized splice-junction boundaries and branch point consensus sequences within identified candidate genes.
Conducted phylogenetic analyses on identified Giardia spliceosomal peptide homologues, including Sm and like-Sm core peptides.
Discovered a 35-bp spliceosomal intron in a gene encoding a putative [2Fe-2S] ferredoxin, possessing a noncanonical 5' CT splice site, a canonical 3' AG splice site, and a modified branch point motif (AACTAAC).
Identified homologues of core eukaryotic spliceosomal proteins, including Prp8, Prp11, DExH-box RNA helicases, and 11 Sm and like-Sm peptides originating from ancestral gene duplications.

Cite This Study

Nixon et al. (2002) studied this question.

synapsesocial.com/papers/6a86b91b36c36f97809eb03e https://doi.org/10.1073/pnas.042700299

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Implication

Genomic analysis uncovers a spliceosomal intron and splicing machinery in Giardia lamblia, indicating that introns emerged prior to the divergence of early eukaryotic lineages.

A spliceosomal intron in Giardia lamblia

Discussion

Member takes

Implication

Key Points

Cite This Study

A spliceosomal intron in Giardia lamblia

Discussion

Member takes

Implication

Key Points

Cite This Study

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