Gene Relationship
GET /api/genes/TTC8/relationships/variant_set?format=api
{
    "data": [
        {
            "type": "SmallVariant",
            "id": "117"
        },
        {
            "type": "SmallVariant",
            "id": "289"
        },
        {
            "type": "SmallVariant",
            "id": "296"
        },
        {
            "type": "SmallVariant",
            "id": "297"
        },
        {
            "type": "SmallVariant",
            "id": "1368"
        },
        {
            "type": "SmallVariant",
            "id": "2468"
        },
        {
            "type": "SmallVariant",
            "id": "3491"
        }
    ]
}