IPD-MHC Database

Ovine (OLA) Sequences (Version 1.5.0 December 2010)

Thank you for visiting the IPD-MHC OLA sequence website. This site is intended to provide a source of information on the ovine leukocyte antigen (OLA) complex, the Major Histocompatibility Complex of domestic sheep Ovis aries as well as other species within the genus Ovis. This site is encouraged and supported by the comparative MHC steering committee of the International Society for Animal Genetics. Its purpose is to collate data on the ovine leukocyte antigens and to provide a forum for the analysis, verification and nomenclature of allelic polymorphisms in the genes and proteins of the ovine MHC.

We have listed currently known alleles which meet the criteria described bellow, as nucleotide sequence alignments, for OLA class I and class II loci in tables within this site. New nomenclature is used where possible, and tables of previous equivalents are given. Accession numbers and references for published sequences are also listed.

For more information on OLA nomenclature pleases contact;

Dr Keith Ballingall
Moredun Research Institute
Pentlands Science Park
Bush Loan
EH26 0PZ

Tel: +44 (0) 131 445 5111 ext 161
Email: Keith Ballingall (

Prof Mike Stear
Department of Veterinary Medicine
Glasgow University
G61 1QH

Tel: +44 (0) 141 330 5762
Email: Mike Stear (

Ovine Group Logo

For further information on nomenclature, please see:

  • Ballingall KT, Herrmann-Hoesing L, Robinson J, Marsh SGE, Stear MJ
    A single nomenclature and associated database for alleles at the major histocompatibility complex class II DRB1 locus of sheep
    Tissue Antigens (2011), 77:543-56

The first volume of Nucleic Acids Research in 2010 is dedicated to factual databases in the field of molecular biology and contains the following paper on IPD.

Further Information

For more information on the OLA nomenclature please contact For information regarding the website and technical issues please contact IPD Support