Broadening the phenotype of LRRK1 mutations - Features of malignant osteopetrosis and optic nerve atrophy with intrafamilial variable expressivity

Odelia Chorin, Guy Chowers, Rawan Agbariah, Shani Karklinsky, Ortal Barel, Ifat Bar-Joseph, Haike Reznik-Wolf, Jana Shamash, Ben Pode-Shakked, Jeffrey M. Jacobson, Ruth Huna-Baron, Yael Redler, Irit Tirosh, Asaf Vivante, Annick Raas-Rothschild*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Osteosclerotic metaphyseal dysplasia is a rare disorder which features osteosclerosis involving long bones, vertebrae, ribs, clavicles and the iliac crests. Additional features which have variably been reported include developmental delay, short stature, hypotonia and seizures. The disease is caused by pathogenic variants in the LRRK1 gene, and inherited in an autosomal recessive manner. We report three siblings (ages 14 years, 11.5 years and 0.9 years), born to consanguineous parents of Arab-Muslim descent, harboring a homozygous pathogenic variant in the LRRK1 gene (Chr15:101068759 AGGGGCT>A, c.5965_5970del TGGGGC, p.Trp1989Gly1990del). The patients displayed variable degrees of skeletal dysplasia, with the oldest sibling most severely affected, and the youngest infant with minor skeletal involvement. Two of the siblings exhibited normal neurological development, while the youngest sibling exhibited global developmental delay. None of the siblings had seizures; however, two of them exhibited nystagmus. Optic nerve involvement has not previously been reported to be part of the clinical spectrum of this disease. The degree of optic nerve involvement did not correlate with the degree of skeletal involvement. This indicates both intra-familial variable expressivity along with a broadening of the spectrum of LRRK1-associated disease. These findings warrant reconsideration of therapeutic strategies, including the possibility of hematopoietic stem cell transplantation (HSCT) as is performed in cases of malignant and intermediate forms of osteopetrosis.

Original languageEnglish
Article number104383
JournalEuropean Journal of Medical Genetics
Volume65
Issue number1
DOIs
StatePublished - Jan 2022

Keywords

  • Jaw osteomyelitis
  • LRRK1
  • Optic nerve atrophy
  • Osteosclerosis
  • Osteosclerotic metaphyseal dysplasia
  • Pathological fractures

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