Gene Relationship
GET /api/genes/PKD1/relationships/variant_set?format=api
{
    "data": [
        {
            "type": "SmallVariant",
            "id": "636"
        },
        {
            "type": "SmallVariant",
            "id": "2081"
        },
        {
            "type": "SmallVariant",
            "id": "3615"
        },
        {
            "type": "SmallVariant",
            "id": "3709"
        }
    ]
}