A homozygous mutation in the TUB gene associated with retinal dystrophy and obesity

Hum Mutat. 2014 Mar;35(3):289-93. doi: 10.1002/humu.22482. Epub 2013 Dec 20.

Abstract

Inherited retinal dystrophies are a major cause of childhood blindness. Here, we describe the identification of a homozygous frameshift mutation (c.1194_1195delAG, p.Arg398Serfs*9) in TUB in a child from a consanguineous UK Caucasian family investigated using autozygosity mapping and whole-exome sequencing. The proband presented with obesity, night blindness, decreased visual acuity, and electrophysiological features of a rod cone dystrophy. The mutation was also found in two of the proband's siblings with retinal dystrophy and resulted in mislocalization of the truncated protein. In contrast to known forms of retinal dystrophy, including those caused by mutations in the tubby-like protein TULP-1, loss of function of TUB in the proband and two affected family members was associated with early-onset obesity, consistent with an additional role for TUB in energy homeostasis.

Keywords: TUB; cilia; obesity; retinal dystrophy; tubby.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing
  • Child
  • Chromosome Mapping
  • Consanguinity
  • European Continental Ancestry Group / genetics
  • Eye Proteins / genetics
  • Female
  • Frameshift Mutation*
  • Genes, Recessive
  • Homeostasis
  • Homozygote*
  • Humans
  • Male
  • Obesity / genetics*
  • Pedigree
  • Proteins / genetics*
  • Retinitis Pigmentosa / genetics*
  • United Kingdom

Substances

  • Adaptor Proteins, Signal Transducing
  • Eye Proteins
  • Proteins
  • TUB protein, human
  • TULP1 protein, human