diff --git a/schemas/disease_target_evidence.json b/schemas/disease_target_evidence.json
index 11370c8..15d075c 100644
--- a/schemas/disease_target_evidence.json
+++ b/schemas/disease_target_evidence.json
@@ -479,6 +479,9 @@
         "variantHgvsId": {
           "$ref": "#/definitions/variantHgvsId"
         },
+        "variantFromSourceId": {
+          "$ref": "#/definitions/variantFromSourceId"
+        },
         "variantId": {
           "$ref": "#/definitions/variantId"
         },
@@ -548,6 +551,9 @@
         "variantHgvsId": {
           "$ref": "#/definitions/variantHgvsId"
         },
+        "variantFromSourceId": {
+          "$ref": "#/definitions/variantFromSourceId"
+        },
         "variantId": {
           "$ref": "#/definitions/variantId"
         },
@@ -2433,6 +2439,14 @@
         "LRG_214t1:c.889-1633_7395-667del"
       ]
     },
+    "variantFromSourceId": {
+      "type": "string",
+      "description": "Identifier of the disease-causing variant at source.",
+      "examples": [
+        "NC_000011.10:g.17605796C>T",
+        "VCV000018397"
+      ]
+    },
     "variantId": {
       "type": "string",
       "description": "Identifier in CHROM_POS_REF_ALT notation of the disease-causing variant.",