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A conserved segmental duplication within ELA.

C L Brinkmeyer-Langford¹, W J Murphy, C P Childers

¹Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843-4458, USA. cbrinkmeyer@cvm.tamu.edu

Animal Genetics

|November 13, 2010

Summary

This summary is machine-generated.

The horse major histocompatibility complex (MHC) contains a unique segmental duplication absent in humans, found in other Perissodactyls. This ancient duplication shows gene transcription, suggesting a functional role in horses.

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Area of Science:

Genomics
Immunogenetics
Comparative genomics

Background:

The horse major histocompatibility complex (MHC), known as equine lymphocyte antigen (ELA), shares similarities with the human leukocyte antigen (HLA).
A significant difference is a large segmental duplication at the ELA class I/III boundary, absent in HLA.

Purpose of the Study:

To characterize the unique segmental duplication in the horse MHC.
To investigate the evolutionary origin and functional relevance of this duplication.

Main Methods:

Genomic sequence analysis of the horse MHC.
Phylogenetic analysis.
Reverse-transcriptase PCR (RT-PCR) to detect gene transcription.

Main Results:

The ELA segmental duplication spans ~710 kb with at least 11 repeated blocks, including MHC class I-like and BAT1-like sequences.
Similar duplications found in other Perissodactyls suggest an ancient origin.
RT-PCR confirmed transcription from genes within the duplicated region in horse white blood cells.

Conclusions:

The horse MHC contains an ancient, functionally relevant segmental duplication not found in most mammals.
This duplication, present in Perissodactyls and felines, highlights unique evolutionary paths in mammalian MHC organization.