The sex chromosome pair has been identified previously as the largest submetacentric pair in the genome in several species of the genus Salvelinus (eastern trouts and chars) including S. namaycush (lake trout) and as a large subtelocentric/acrocentric pair in several species of the genus Oncorhynchus (Pacific trouts and salmon). Sex chromosomes have not been identified in Salmo (Atlantic salmon and brown trout). Two paint probes, one specific for the short arm (Yp) and the other for the long arm (Yq) of the sex chromosome pair in Salvelinus namaycush were hybridized to chromosomes of Oncorhynchus mykiss (rainbow trout) and O. tshawytscha (chinook salmon) and Salmo salar (Atlantic salmon) and S. trutta (brown trout). The two probes hybridized to two different autosomal pairs in each of the Oncorhynchus species, supporting lack of homology between the sex chromosomes in the two genera. The Yp probe hybridized to interstitial regions on two different chromosome pairs in S. salar and one pair in S. trutta. The Yq probe hybridized to a different pair in both species.
Bibliographical noteFunding Information:
We would like to acknowledge the following individuals or organizations who supplied blood or fish: Chris Wilson, Ontario Ministry of Natural Resources (Atlantic salmon), Manager, Nevin Fish Hatchery, Madison Wisconsin (brown trout), Bill Hershberger director of the USDA Cold Water Aquaculture Lab in Kearneysville, West Virginia (rainbow trout) and Kettle Morraine Springs Fish Hatchery, Wisconsin (chinook salmon). This work was supported by grant 98-35205-6874 from the National Research Initiative program of the United States Department of Agriculture.
- Chromosome painting
- Salmonid fishes
- Sex chromosomes