For DQ6, however, cis-isoform pairing only occurs with DQ1 α-chains.
HLA-DR1 is not genetically linked to DR51, DR52 or DR53, but is linked to HLA-DQ1 and DQ5 serotypes.
HLA-DR10 is not genetically linked to DR51, DR52 or DR53, but is linked to HLA-DQ1 and DQ5 serotypes.
see also