KCTD1/KCTD15 complexes control ectodermal and neural crest cell functions, and their impairment causes aplasia cutis

• Published in: The Journal of clinical investigation Vol. 134; no. 4; pp. 1 - 22
• Main Authors: Raymundo, Jackelyn R, Zhang, Hui, Smaldone, Giovanni, Zhu, Wenjuan, Daly, Kathleen E, Glennon, Benjamin J, Pecoraro, Giovanni, Salvatore, Marco, Devine, William A, Lo, Cecilia W, Vitagliano, Luigi, Marneros, Alexander G
• Format: Journal Article
• Language: English
• Published: United States American Society for Clinical Investigation 15-02-2024
• Subjects: Aplasia; Causes of; Co-Repressor Proteins; Cranial sutures; Defects; Development and progression; Ectodermal dysplasia; Ectodermal Dysplasia - genetics; Embryonic development; Epidermis; Fibrosis; Gene mutations; Genetic aspects; Growth factors; Health aspects; Heart; Humans; Keratinocytes; Mass spectrometry; Medical research; Medicine, Experimental; Mutation; Neural Crest; Physiological aspects; Potassium Channels - genetics; Proteins; Scalp - abnormalities; Scientific imaging; Skin; Skull; Transcription factors; United States; Development; Embryonic development; Skin; Dermatology; Mouse models
• ISSN: 1558-8238; 0021-9738; 1558-8238
• DOI: 10.1172/JCI174138

Aplasia cutis congenita (ACC) is a congenital epidermal defect of the midline scalp and has been proposed to be due to a primary keratinocyte abnormality. Why it forms mainly at this anatomic site has remained a long-standing enigma. KCTD1 mutations cause ACC, ectodermal abnormalities, and kidney fibrosis, whereas KCTD15 mutations cause ACC and cardiac outflow tract abnormalities. Here, we found that KCTD1 and KCTD15 can form multimeric complexes and can compensate for each other's loss and that disease mutations are dominant negative, resulting in lack of KCTD1/KCTD15 function. We demonstrated that KCTD15 is critical for cardiac outflow tract development, whereas KCTD1 regulates distal nephron function. Combined inactivation of KCTD1/KCTD15 in keratinocytes resulted in abnormal skin appendages but not in ACC. Instead, KCTD1/KCTD15 inactivation in neural crest cells resulted in ACC linked to midline skull defects, demonstrating that ACC is not caused by a primary defect in keratinocytes but is a secondary consequence of impaired cranial neural crest cells, giving rise to midline cranial suture cells that express keratinocyte-promoting growth factors. Our findings explain the clinical observations in patients with KCTD1 versus KCTD15 mutations, establish KCTD1/KCTD15 complexes as critical regulators of ectodermal and neural crest cell functions, and define ACC as a neurocristopathy.