Pediatric Complement Receptor Deficiency Differential Diagnoses
- Author: Alan P Knutsen, MD; Chief Editor: Harumi Jyonouchi, MD more...
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| Receptor | Cluster Designation | Ligand | Cell Distribution | Activity |
| CR1 | CD35 | C3b/C4b | RBC, polymorphonuclear cell, macrophage, B cell, follicular dendritic cell | Immune adherence, phagocytosis |
| CR2 | CD21 | C3dg/C3d | B cell, follicular dendritic cell | Co-receptor for B-cell signaling |
| CR3 | CD11b/CD18 | C3bi, ICAM | Myeloid | Phagocytosis, immune adherence |
| CR4 | CD11c/CD18 | C3bi, ICAM | Myeloid | Phagocytosis, immune adherence |
| C1qRP | None | C1q, MBL, surfactant | Polymorphonuclear cell, macrophage | Promotes phagocytosis |
| C3aR | None | C3a, C4a | Polymorphonuclear cell, macrophage, epithelial cell, smooth-muscle cell | Anaphylatoxin |
| C4aR | None | C4a | Polymorphonuclear cell, macrophage, epithelial cell, smooth-muscle cell | Anaphylatoxin |
| C5aR | CD88 | C5a | Polymorphonuclear cell, macrophage, epithelial cell, smooth-muscle cell | Anaphylatoxin |
| ICAM = intercellular adhesion molecule, MBL = mannose-binding lectin | ||||
| Disease | Inheritance | Genetic Defect | Protein Defect | Affected Cells | Affected Function | Manifestations |
| LAD type 1 | Autosomal recessive | INTGB2 | CD18 | Polymorphonuclear cell, macrophage, lymphocytes, NK cells | Tight adherence, chemotaxis, endocytosis, T-cell/NK-cell cytotoxicity | Delayed cord separation, skin ulcers, periodontitis, leukocytosis, poor pus formation |
| LAD type 2 | Autosomal recessive | FUCT1 encoding for GDP-fucose transporter | Fucosylated proteins, sialyl-Lewis X (sLeX, CD15s) | Polymorphonuclear cell, macrophage | Rolling, chemotaxis, tethering | Same as LAD type 1 plus hh-blood group, mental retardation |
| LAD type 3 | Autosomal recessive | Kindlin 3 (FERMT3), involved in activation of integrin | Kindlin 3 | Polymorphonuclear cell, macrophage, lymphocytes, NK cells | Tight adherence | Same as LAD type 1 plus bleeding tendency |
| Rac 2 deficiency | Possibly autosomal dominant | RAC2 | Rac2, involved in regulation of actin cytoskeleton | Polymorphonuclear cell, decreased TRECs | Chemotaxis, O2- production | Recurrent infections, poor wound healing, leukocytosis, poor pus formation |
| E-selectin | Possibly autosomal recessive | Unknown | E-selectin | Endothelial cells | Rolling, tethering | Recurrent infections, poor pus formation, mild neutropenia |
| NK = Natural killer, TRECs = T-cell receptor excision circles | ||||||
| Molecule | CD Number | Distribution | Ligand | Function |
| Integrins | ||||
| LFA-1 | CD11a/CD18 | All leukocytes | ICAM-1, 2, 3 | Adhesion, migration |
| CR3 | CD11b/CD18 | Polymorphonuclear cell, macrophage, NK cells, eosinophils | ICAM-1,2; C3bi | Adhesion, migration |
| CR4 | CD11c/CD18 | All leukocytes | C3bi, ICAM-1, CD23, fibrinogen | Adhesion |
| Alpha4-beta7 | None | Lymphocytes, NK cells, eosinophils | MadCAM-1, VCAM-1, fibronectin | Adhesion, migration, rolling |
| VLA-4 | CD49d/CD29 | Lymphocytes, NK cells, eosinophils, basophils | VCAM-1, fibronectin | Adhesion, migration, rolling |
| Selectins | ||||
| E | CD62E | Endothelial cells, platelets | Sialylated, fucosylated molecules (sLeX, CD15s) expressed on PSGL-1 and ESL-1 | Rolling |
| P | CD62P | Endothelial cells, platelets | Sialylated, fucosylated molecules (sLeX) expressed on PSGL-1 | No data |
| L | CD62L | Leukocytes | Sialylated, fucosylated molecules (often sulfated) expressed on CD34, MadCAM-1 and other glycoproteins-1 | Rolling |
| MadCAM = Mucosal addressin cell adhesion molecule; VCAM = Vascular cell adhesion molecule; VLA = Very late activation antigen | ||||
| Subtype | mRNA level | CD18 Expression | Clinical Presentation |
| 1 | None | None | Severe |
| 2 | Low | Trace | Moderate |
| 3 | Reference range | Trace, small protein precursor | Moderate |
| 4 | Reference range | Large protein precursor | Severe |
| 5 | Reference range | Normal protein precursor | Moderate |
| mRNA = messenger RNA. | |||

