A new 1p36.13-1p36.12 microdeletion syndrome characterized by learning disability, behavioral abnormalities, and ptosis

Clin Genet. 2020 Jun;97(6):927-932. doi: 10.1111/cge.13739. Epub 2020 Apr 1.

Abstract

Two 1p36 contiguous gene deletion syndromes are known so far: the terminal 1p36 deletion syndrome and a 1p36 deletion syndrome with a critical region located more proximal at 1p36.23-1p36.22. We present even more proximally located overlapping deletions from seven individuals, with the smallest region of overlap comprising 1 Mb at 1p36.13-1p36.12 (chr1:19077793-20081292 (GRCh37/hg19)) defining a new contiguous gene deletion syndrome. The characteristic features of this new syndrome are learning disability or mild intellectual disability, speech delay, behavioral abnormalities, and ptosis. The genes UBR4 and CAPZB are considered the most likely candidate genes for the features of this new syndrome.

Keywords: behavioral abnormality; chromosome deletion; chromosomes; human; learning disability; pair 1; ptosis.

MeSH terms

  • Blepharoptosis / genetics*
  • Blepharoptosis / pathology
  • Calmodulin-Binding Proteins / genetics*
  • CapZ Actin Capping Protein / genetics*
  • Chromosome Deletion
  • Chromosome Disorders / genetics*
  • Chromosome Disorders / pathology
  • Chromosomes, Human, Pair 1 / genetics
  • Developmental Disabilities / genetics
  • Developmental Disabilities / pathology
  • Female
  • Genetic Association Studies
  • Humans
  • Intellectual Disability / genetics
  • Intellectual Disability / pathology
  • Learning Disabilities / genetics*
  • Learning Disabilities / pathology
  • Male
  • Phenotype
  • Ubiquitin-Protein Ligases / genetics*

Substances

  • CAPZB protein, human
  • Calmodulin-Binding Proteins
  • CapZ Actin Capping Protein
  • UBR4 protein, human
  • Ubiquitin-Protein Ligases

Supplementary concepts

  • Chromosome 1p36 Deletion Syndrome
  • Ptosis, Hereditary Congenital 1