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Initial characterization of a protochordate histocompatibility locus.
Anthony W De Tomaso1, Irving L Weissman
1Hopkins Marine Station, Pacific Grove, CA 93950, USA. tdet@stanford.edu
Immunogenetics
|October 2, 2003
Summary
Researchers are mapping the highly variable Fu/HC locus in Botryllus schlosseri, a key gene controlling transplantation. This study provides the first genomic analysis of a metazoan histocompatibility locus outside vertebrates, identifying novel genes.
Area of Science:
- Marine biology
- Genomics
- Immunology
Background:
- The colonial protochordate Botryllus schlosseri exhibits a natural transplantation reaction.
- This reaction is governed by a single, highly polymorphic locus known as the Fu/HC locus.
Purpose of the Study:
- To identify the gene(s) responsible for the Fu/HC locus using map-based cloning.
- To perform the first genomic analysis of a metazoan histocompatibility locus outside of vertebrates.
Main Methods:
- Map-based cloning to delineate the Fu/HC locus region.
- Physical mapping utilizing 85 sequence-tagged sites on an 800 kb minimum tiling path.
- Sequencing of approximately half of the locus region.
Main Results:
- The Fu/HC locus was mapped to a 1-cM region, with a physical map estimated to be 75% complete.
- Analysis revealed 18 predicted genes, several of which are expressed and conserved among chordates.
- The Fu/HC locus is highly polymorphic and dynamic, featuring recombination hotspots.
Conclusions:
- The study provides a foundational genomic understanding of a non-vertebrate histocompatibility locus.
- Identified genes at the Fu/HC locus offer new avenues for research into immune system evolution.
- The polymorphic and dynamic nature of the Fu/HC locus highlights its significance in B. schlosseri transplantation biology.