{
  "id": 4652960,
  "title": "Thymic keratin76 shapes skin-specific central tolerance",
  "url": "https://urgent.news/2026/08/31/thymic-keratin76-shapes-skin-specific-central-tolerance",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-31T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.27.747460v1?rss=1"
  },
  "original_language": "en",
  "account": "Recent research has unveiled a previously unconsidered role for keratin 76 (Krt76) in thymic central tolerance to skin and oral mucosa-targeting T cells. Traditionally, inflammatory skin disorders resulting from immunopathology have been attributed to disrupted barrier integrity and subsequent microbial invasion. However, this study challenges this notion by demonstrating that Krt76 plays a crucial role in preventing skin-targeting autoimmune responses.\n\nThe researchers found that transferring Krt76-deficient thymic lobes under the kidney capsules of athymic recipients led to the expansion of effector T cells in secondary lymphoid organs, T cell infiltration into skin, and autoantibody reactivity to both skin and oral mucosa tissue. The loss of thymic Krt76 expression disrupted the canonical differentiation of the thymic medulla, affecting the development of post-AIRE-expressing keratinocyte-like mimetic medullary epithelial cells (termed CorneoTECs).\n\nInterestingly, CorneoTECs that express Krt76 display a unique skin and oral mucosa-associated gene signature, including skin-specific tissue self-antigens (TSAs). In the absence of Krt76, this TSA signature is almost entirely lost, leading to impaired T cell negative selection. These findings collectively highlight the importance of Krt76 in maintaining thymic central tolerance to skin and oral mucosa-targeting T cells. The study also suggests that loss-of-keratin-associated skin disorders may encompass autoimmune pathologies as well.",
  "summary": "Keratin gene mutations are often associated with inflammatory skin disorders, in which the ensuing immunopathology is generally attributed to disrupted barrier integrity and consequent microbial invasion. Here, we challenge this paradigm by demonstrating a role for keratin 76 (Krt76) in thymic central tolerance to skin-targeting autoimmune responses. We show that transfer of Krt76-/- thymic lobes…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}