The orientation of the horse (Equus caballus) IGH locus on the chromosome 24 is reverse (REV).
Legend:
Colors are according to IMGT color menu for genes.
The boxes representing the genes are not to scale. Exons are not shown.
A double slash // indicates a gap in genome assembly. Distances in bp (base pair) or in kb (kilobase) associated with a double slash are taken
into account in the length of the lines and included in the numbers displayed at the right end of the lines.
A dotted line ... indicates the distance in kb (kilobase) between the locus and its bornes (5' borne and the most 5' gene in the locus and/or 3'
borne and the most 3' gene in the locus) on the top and bottom lines, respectively. These distances are not represented at scale and/or are not
included in IMGT-LOCUS-UNIT and may not be included in the numbers displayed at the right ends of these two lines
.
IGH gene names are according to the IMGT nomenclature [1].
Single arrows show genes whose polarity is opposite to that of the D-J-C-CLUSTER comprising IGHD (D1 to D40)-IGHJ (J1 to J9)-IGHC (IGHM-IGHD-IGHG1-IGHG2-IGHG3-IGHG4-IGHG6-IGHG5-IGHE-IGHA).
There are several gaps in the locus, the follow ones are not represented: the gap between IGHV4-37D and IGHV1-41, the gap between IGHV4-42 and GHV1-41D and the one between IGHV4-37D and IGHV1-41.
The IGHG7 constant gene is not found in the EquCab3.0 assembly, there is a gap at this position (IMGT000040 accession number). However, IGHG7 is found in the accession numbers NW_019645282 and in AY445517 [2]