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Hoxb8 is required for normal grooming behavior in mice.

Joy M Greer¹, Mario R Capecchi

¹Howard Hughes Medical Institute, Department of Human Genetics, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.

|January 10, 2002

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Mice lacking the Hoxb8 gene exhibit excessive grooming, leading to self-inflicted hair loss and lesions. This suggests Hoxb8 plays a crucial role in regulating grooming behavior within the central nervous system (CNS).

Area of Science:

Neuroscience
Genetics
Animal Behavior

Background:

Grooming behaviors are essential for survival across many species, including humans.
The specific genes controlling complex grooming behaviors remain largely unidentified.
Aberrant grooming can manifest as pathological conditions, such as trichotillomania in humans.

Purpose of the Study:

To identify genes influencing grooming behavior.
To investigate the role of Hoxb8 in the regulation of grooming.
To explore the potential link between Hoxb8 and compulsive behaviors.

Main Methods:

Generation and behavioral analysis of mice with disrupted Hoxb8 genes.
Assessment of skin and peripheral nervous system (PNS) for abnormalities.

Related Experiment Videos

Analysis of Hoxb8 gene expression in the adult mouse central nervous system (CNS).

Main Results:

Mice with Hoxb8 disruptions displayed excessive grooming, resulting in hair loss and skin lesions with 100% penetrance.
No skin or PNS abnormalities were detected in the Hoxb8 mutant mice.
Hoxb8 expression was confirmed in CNS regions associated with grooming control and the 'OCD-circuit.'

Conclusions:

The study implicates Hoxb8 as a critical regulator of grooming behavior.
Abnormal Hoxb8 function leads to excessive, pathological grooming, likely due to CNS abnormalities.
Hoxb8 may represent a genetic link to obsessive-compulsive spectrum disorders like trichotillomania.