Hyperactive and impulsive behaviors of LMTK1 knockout mice

Miyuki Takahashi, Arika Sugiyama, Ran Wei, Shizuka Kobayashi, Kimiko Fukuda, Hironori Nishino, Roka Takahashi, Koji Tsutsumi, Ichiro Kita, Kanae Ando, Toshiya Manabe, Hiroyuki Kamiguchi, Mineko Tomomura, Shin ichi Hisanaga*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Lemur tail kinase 1 (LMTK1), previously called Apoptosis-Associated Tyrosine Kinase (AATYK), remains an uncharacterized Ser/Thr protein kinase that is predominantly expressed in the brain. It is recently reported that LMTK1A, an isoform of LMTK1, binds to recycling endosomes through its palmitoylation and regulates endosomal trafficking by suppressing the activity of Rab11 small GTPase. In neurons, knockdown or knockout of LMTK1 results in longer axons, greater branching of dendrites and increased number of spines, suggesting that LMTK1 plays a role in neuronal circuit formation. However, its in vivo function remained to be investigated. Here, we examined the brain structures and behaviors of LMTK1 knockout (KO) mice. LMTK1 was expressed in most neurons throughout the brain. The overall brain structure appeared to be normal in LMTK1 KO mice, but the numbers of synapses were increased. LMTK1 KO mice had a slight impairment in memory formation and exhibited distinct psychiatric behaviors such as hyperactivity, impulsiveness and high motor coordination without social interaction deficits. Some of these abnormal behaviors represent core features of attention deficit hyperactive disorder (ADHD), suggesting the possible involvement of LMTK1 in the pathogenesis of ADHD.

Original languageEnglish
Article number15461
JournalScientific reports
Issue number1
Publication statusPublished - 2020 Dec 1

ASJC Scopus subject areas

  • General


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