Novel genetic and biochemical findings of DLK1 in children with central precocious puberty: A Brazilian–Spanish Study

Luciana Montenegro, José I. Labarta, Maira Piovesan, Ana P.M. Canton, Raquel Corripio, Leandro Soriano-Guillén, Lourdes Travieso-Suárez, Álvaro Martín-Rivada, Vicente Barrios, Carlos E. Seraphim, Vinicius N. Brito, Ana Claudia Latronico*, Jesús Argente

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Background: Central precocious puberty (CPP) has been associated with loss-of-function mutations in 2 paternally expressed genes (MKRN3 and DLK1). Rare defects in the DLk1 were also associated with poor metabolic phenotype at adulthood. Objective: Our aim was to investigate genetic and biochemical aspects of DLK1 in a Spanish cohort of children with CPP without MKRN3 mutations. Patients: A large cohort of children with idiopathic CPP (Spanish PUBERE Registry) was studied. Genomic deoxyribonucleic acid was obtained from 444 individuals (168 index cases) with CPP and their close relatives. Automatic sequencing of MKRN3 and DLK1 genes were performed. Results: Five rare heterozygous mutations of MKRN3 were initially excluded in girls with familial CPP. A rare allelic deletion (c.401_404 + 8del) in the splice site junction of DLK1 was identified in a Spanish girl with sporadic CPP. Pubertal signs started at 5.7 years. Her metabolic profile was normal. Familial segregation analysis showed that the DLK1 deletion was de novo in the affected child. Serum DLK1 levels were undetectable (<0.4 ng/mL), indicating that the deletion led to complete lack of DLK1 production. Three others rare allelic variants of DLK1 were also identified (p.Asn134=; g.-222 C>A and g.-223 G>A) in 2 girls with CPP. However, both had normal DLK1 serum levels. Conclusion: Loss-of-function mutations of DLK1 represent a rare cause of CPP, reinforcing a significant role of this factor in human pubertal timing. (J Clin Endocrinol Metab 105: 1–8, 2020)

Original languageAmerican English
JournalJournal of Clinical Endocrinology and Metabolism
Volume105
Issue number10
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • DLK1
  • Genetics
  • Mutations
  • Precocious puberty

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