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A growth hormone pseudogene in the salmon genome
V M Kavsan1, A P Koval, Palamarchuk AJu
1Institute of Molecular Biology and Genetics, Ukrainian Academy of Sciences, Kiev.
Gene
|April 20, 1994
Summary
Chum salmon possess two functional growth hormone (GH) genes. Researchers discovered a third GH-like sequence in chum salmon DNA, which is a non-functional pseudogene due to mutations.
Area of Science:
- Genomics
- Molecular Biology
- Fish Biology
Background:
- The fish family Salmonidae is known to have two nonallelic growth hormone (GH)-encoding genes.
- Growth hormone plays a crucial role in fish growth and development.
Purpose of the Study:
- To investigate the presence and nature of additional growth hormone-encoding genes in chum salmon.
- To determine if the chum salmon genome contains more than the previously reported two GH genes.
Main Methods:
- Screening of a chum salmon genomic DNA library.
- Sequence analysis of identified GH-like DNA sequences.
- Identification of mutations and deletions within the sequences.
Main Results:
- A third GH-like sequence was identified in the chum salmon genomic DNA.
- This sequence contained numerous point mutations and large deletions.
- These genetic alterations render the third GH-like sequence non-functional, classifying it as a pseudogene.
Conclusions:
- Chum salmon possess a GH pseudogene in addition to their two functional GH genes.
- The discovery of GH pseudogenes provides insights into the evolution of the growth hormone gene family in salmonids.
- Understanding gene duplication and pseudogenization is important for evolutionary and genetic studies in fish.