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Somatic Deficiency of the Human E3 Ubiquitin Ligase Cbl in Leukocytes Impairs B Cell But Not T Cell Development and Function Publisher Pubmed



Vatovec T ; Neehus AL ; Jackson KJL ; Avery DT ; Bagaric I ; Erazo L ; Arangofranco CA ; Ogishi M ; Ahmed SF ; Cederholm A ; Russell AJ ; Della Mina E ; Alrifai D ; Bull R Show All Authors
Authors
  1. Vatovec T
  2. Neehus AL
  3. Jackson KJL
  4. Avery DT
  5. Bagaric I
  6. Erazo L
  7. Arangofranco CA
  8. Ogishi M
  9. Ahmed SF
  10. Cederholm A
  11. Russell AJ
  12. Della Mina E
  13. Alrifai D
  14. Bull R
  15. Buetow L
  16. Sobrino S
  17. Zhang A
  18. Wahlster L
  19. Michelet M
  20. Parvaneh N
  21. Peel J
  22. Barzaghi F
  23. Leardini D
  24. Philippot Q
  25. Saettini F
  26. Dutrieux J
  27. De Muylder B
  28. Vendemini F
  29. Baccelli F
  30. Catala A
  31. Gambineri E
  32. Veltroni M
  33. Pandiarajan V
  34. Aguilar Y
  35. Haerynck F
  36. Elliott M
  37. Turville S
  38. Brillot F
  39. Khan T
  40. Consonni F
  41. Berteloot L
  42. Sewell WA
  43. Rao G
  44. Largeaud L
  45. Conti F
  46. Roullion C
  47. Masson C
  48. Pegoraro F
  49. Ye T
  50. Joubran S
  51. Villalpando E
  52. Bessot B
  53. Seeleuthner Y
  54. Le Voyer T
  55. Rosain J
  56. Li H
  57. Janda Z
  58. Muratore E
  59. Soudee C
  60. Delabesse E
  61. Goulvestre C
  62. Shahrooei M
  63. Puel A
  64. Andre I
  65. Bolefeysot C
  66. Abel L
  67. Erlacher M
  68. Beziat V
  69. Lagreslepeyrou C
  70. Cheynier R
  71. Six E
  72. Marr N
  73. Pasquet M
  74. Alsina L
  75. Goodnow CC
  76. Landegren N
  77. Aiuti A
  78. Zhang P
  79. Masetti R
  80. Huang DT
  81. Ma CS
  82. Casanova JL
  83. Sankaran VG
  84. Bustamante J
  85. Tangye SG
  86. Bohlen J

Source: Nature Immunology Published:2026


Abstract

The E3 ubiquitin ligase Casitas B-lineage lymphoma (CBL) promotes positive selection and antigen responses in mouse T lymphocytes by ubiquitinating ZAP70. Conversely, mouse CBL and CBL-B mutually redundantly regulate SYK ubiquitination and B cell receptor signaling. Here we studied individuals with somatically homozygous CBL loss-of-function variants in leukocytes. Human CBL is largely redundant for the development and function of human T cells. Conversely, B cell development is altered at the immature stage, with a tenfold increase in transitional cells, enhanced survival of autoreactive clones and impaired tolerance manifested by autoantibody production. B cell maturation is intrinsically impaired by reduced apoptosis and dysregulated B cell receptor signaling. CBL deficiency impairs humoral immunity by limiting memory B cell formation and reducing class switching and somatic hypermutation. Consequently, antigen-specific B cell generation and adaptive immune memory are disrupted, predisposing individuals to infection. Human CBL is critical for B cell development and function but redundant for T cell biology. © The Author(s) 2026.