Mutation in <i>LBX1/Lbx1</i> precludes transcription factor cooperativity and causes congenital hypoventilation in humans and mice

Abstract

The respiratory rhythm is generated by the preBötzinger complex in the medulla oblongata, and is modulated by neurons in the retrotrapezoid nucleus (RTN), which are essential for accelerating respiration in response to high CO₂ Here we identify a <i>LBX1</i> frameshift (<i>LBX1</i>^<i>FS</i> ) mutation in patients with congenital central hypoventilation. The mutation alters the C-terminal but not the DNA-binding domain of <i>LBX1</i> Mice with the analogous mutation recapitulate the breathing deficits found in humans. Furthermore, the mutation only interferes with a small subset of Lbx1 functions, and in particular with development of RTN neurons that coexpress Lbx1 and Phox2b. Genome-wide analyses in a cell culture model show that Lbx1^FS and wild-type Lbx1 proteins are mostly bound to similar sites, but that Lbx1^FS is unable to cooperate with Phox2b. Thus, our analyses on Lbx1^FS (dys)function reveals an unusual pathomechanism; that is, a mutation that selectively interferes with the ability of Lbx1 to cooperate with Phox2b, and thus impairs the development of a small subpopulation of neurons essential for respiratory control.