NDLI: Genetic variation of the major histocompatibility complex (MHC class II β gene) in the threatened Gila trout, Oncorhynchus gilae gilae

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Conservation Genetics : Volume 9, Issue 1, February 2008

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Genetic variation of the major histocompatibility complex (MHC class II β gene) in the threatened Gila trout, Oncorhynchus gilae gilae

Content Provider	Springer Nature Link
Author	Peters, Maureen B. Turner, Thomas F.
Copyright Year	2007
Abstract	Gila trout (Oncorhynchus gilae gilae) was federally protected in 1973 because of severe declines in abundance and geographic range size. At present, four relict genetic lineages of the species remain in mountain streams of New Mexico and Arizona, USA. Management actions aimed at species recovery, including hatchery production and restocking of formerly occupied streams, have been guided by information from non-functional genetic markers. In this study, we investigated genetic variation at exon 2 of the major histocompatibility complex (MHC) class II β gene that is involved in pathogen resistance and thus presumably under natural selection. Phylogenetic analysis revealed trans-species polymorphism and a significantly high ratio of non-synonymous to synonymous amino acid changes consistent with the action of historical balancing selection that maintained diversity at this locus in the past. However, Gila trout exhibited low allelic diversity (five alleles from 142 individuals assayed) compared to some other salmonid fishes, and populations that originated exclusively from hatcheries possessed three or fewer MHC alleles. Comparative analysis of genetic variation at MHC and six presumably neutrally evolving microsatellite loci revealed that genetic drift cannot be rejected as a primary force governing evolution of MHC in contemporary populations of Gila trout. Maintenance of diversity at MHC will require careful implementation of hatchery breeding protocols and continued protection of wild populations to prevent loss of allelic diversity due to drift.
Starting Page	257
Ending Page	270
Page Count	14
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	9
Issue Number	2
e-ISSN	15729737
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-06-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microsatellites Salmonidae Genetic drift Natural selection Hatchery supplementation Adaptive immunity Evolutionary Biology Plant Sciences Animal Anatomy / Morphology / Histology Human Genetics
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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Genetic variation of the major histocompatibility complex (MHC class II β gene) in the threatened Gila trout, Oncorhynchus gilae gilae

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Genetic variation of the major histocompatibility complex (MHC class II β gene) in the threatened Gila trout, Oncorhynchus gilae gilae