TY  - JOUR
AU  - DiFrancesco, Mattia L
AU  - Mesirca, Pietro
AU  - Bidaud, Isabelle
AU  - Isbrandt, Dirk
AU  - Mangoni, Matteo E
TI  - The funny current in genetically modified mice.
JO  - Progress in biophysics & molecular biology
VL  - 166
SN  - 0079-6107
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - DZNE-2022-00809
SP  - 39 - 50
PY  - 2021
AB  - Since its first description in 1979, the hyperpolarization-activated funny current (If) has been the object of intensive research aimed at understanding its role in cardiac pacemaker activity and its modulation by the sympathetic and parasympathetic branches of the autonomic nervous system. If was described in isolated tissue strips of the rabbit sinoatrial node using the double-electrode voltage-clamp technique. Since then, the rabbit has been the principal animal model for studying pacemaker activity and If for more than 20 years. In 2001, the first study describing the electrophysiological properties of mouse sinoatrial pacemaker myocytes and those of If was published. It was soon followed by the description of murine myocytes of the atrioventricular node and the Purkinje fibres. The sinoatrial node of genetically modified mice has become a very popular model for studying the mechanisms of cardiac pacemaker activity. This field of research benefits from the impressive advancement of in-vivo exploration techniques of physiological parameters, imaging, genetics, and large-scale genomic approaches. The present review discusses the influence of mouse genetic on the most recent knowledge of the funny current's role in the physiology and pathophysiology of cardiac pacemaker activity. Genetically modified mice have provided important insights into the role of If in determining intrinsic automaticity in vivo and in myocytes of the conduction system. In addition, gene targeting of f-(HCN) channel isoforms have contributed to elucidating the current's role in the regulation of heart rate by the parasympathetic nervous system. This review is dedicated to Dario DiFrancesco on his retirement.
KW  - Animals
KW  - Electrophysiological Phenomena
KW  - Heart Rate
KW  - Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels
KW  - Mice
KW  - Patch-Clamp Techniques
KW  - Rabbits
KW  - Sinoatrial Node
KW  - Cardiac pacemaker activity (Other)
KW  - Conduction system (Other)
KW  - Funny current (Other)
KW  - Genetically modified mice (Other)
KW  - Rhythmogenesis (Other)
KW  - Sinoatrial node (Other)
KW  - Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels (NLM Chemicals)
LB  - PUB:(DE-HGF)16
C6  - pmid:34129872
DO  - DOI:10.1016/j.pbiomolbio.2021.06.003
UR  - https://pub.dzne.de/record/164153
ER  -