Antifreeze Glycoproteins of Two Unrelated Polar Fishes: Gene Structure, Organization and Evolution
Chen, Liangbiao
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https://hdl.handle.net/2142/87256
Description
Title
Antifreeze Glycoproteins of Two Unrelated Polar Fishes: Gene Structure, Organization and Evolution
Author(s)
Chen, Liangbiao
Issue Date
1997
Doctoral Committee Chair(s)
DeVries, Arthur L.
Department of Study
Molecular and Integrative Physiology
Discipline
Molecular and Integrative Physiology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Genetics
Language
eng
Abstract
The AFGPs of the northern cods are also encoded by a family of polyprotein genes in which multiple AFGP coding sequences linked in tandem by small cleavable spacers Args or Arg-Ala-Ala-Arg's. However, the northern cod AFGP genes show no sequence identity with trypsinogen gene, indicating trypsinogen gene is not the progenitor of this group of AFGP genes. The southern and northern AFGP genes also have different signal peptides, different intron-exon organizations, different spacer sequences thus are the processing of the polyprotein precursors, and drastically different codon patterns for the repetitive AFGP coding sequence. This molecular evidence in conjunction with paleontological and paleoclimatic data indicate the near-identical AFGPs of Antarctic notothenioids and northern cods evolved independently.
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