1. Gene
  2. HCN4 - hyperpolarization activated cyclic nucleotide gated potassium channel 4 Gene

HCN4 - hyperpolarization activated cyclic nucleotide gated potassium channel 4 Gene

Homo sapiens

Also known as SSS2; EIG18; BRGDA8

Gene ID: 10021 | Gene type: protein coding

About HCN4

Cytogenetic location: 15q24.1 Genomic coordinates (GRCh38): 15:73,319,859-73,368,958 (from NCBI)

This gene has 1 transcript (splice variant), 291 orthologues, 17 paralogues and is associated with 5 phenotypes. Biased expression in testis (RPKM 3.3), heart (RPKM 1.0) and 3 other tissues.


This gene encodes a member of the hyperpolarization-activated cyclic nucleotide-gated potassium channels. The encoded protein shows slow kinetics of activation and inactivation, and is necessary for the cardiac pacemaking process. This channel may also mediate responses to sour stimuli. Mutations in this gene have been linked to sick sinus syndrome 2, also known as atrial fibrillation with bradyarrhythmia or familial sinus bradycardia. Two pseudogenes have been identified on chromosome 15. [provided by RefSeq, Oct 2008]

HCN4 Products(1)

mRNA Protein Name
NM_005477.3 NP_005468.1 potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4

HCN4 Protein Structure


Ion_trans_N: Ion transport protein N-terminal (217 - 293)


Ion_trans: Ion transport protein (297 - 511)


cNMP_binding: Cyclic nucleotide-binding domain (614 - 697)

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  • 1203 a.a.
Protein Preferred Names Protein Names

potassium/sodium hyperpolarization-activated cyclic nucleotide-gated channel 4

hyperpolarization activated cyclic nucleotide-gated cation channel 4

Related Diseases

Diseases Alias
Sick Sinus Syndrome 2

Sick Sinus Syndrome 2, Autosomal Dominant


Sick Sinus Syndrome 2 With Or Without Cardiac Noncompaction And/Or Ascending Aorta Dilation

Atrial Fibrillation With Bradyarrhythmia

Sinus Node Disease, Familial, Autosomal Dominant

Sinus Bradycardia Syndrome, Familial, Autosomal Dominant

Autosomal Dominant Sick Sinus Syndrome 2

Familial Sinus Bradycardia Syndrome Autosomal Dominant

Sss Autosomal Dominant

Brugada Syndrome 8


Brugada Syndrome, Type 8

Epilepsy, Idiopathic Generalized 18

Epilepsy, Idiopathic Generalized, Susceptibility To, 18


Epilepsy, Idiopathic Generalized, Susceptibility To, Type 18

Familial Sick Sinus Syndrome

Familial Sinus Node Dysfunction

Sick Sinus Syndrome

Sinus Node Dysfunction

Sinus Node Disease

Sinus Node Infection



Snd - [Sinus Node Dysfunction]

Sinoatrial Node Dysfunction

Sss - [Sick Sinus Syndrome]

Sick Sinus

Sick Sinus Tachycardia

Brugada Syndrome

Sudden Unexpected Nocturnal Death Syndrome

Sudden Unexplained Nocturnal Death Syndrome


Brugada Type Idiopathic Ventricular Fibrillation

Pokkuri Death Syndrome


Idiopathic Ventricular Fibrillation, Brugada Type

Sudden Unexplained Death

Dream Disease

Right Bundle Branch Block, St Segment Elevation, And Sudden Death Syndrome

Sudden Unexplained Death Syndrome


Sunds - [Sudden Unexplained Nocturnal Death Syndrome]

Atrial Fibrillation


Fibrillation, Atrial

Af - [Atrial Fibrillation]

Rapid Atrial Fibrillation

A Fib - [Atrial Fibrillation]

Sinoatrial Node Disease

Sa Node

Sinuatrial Node

Sinus Node Dysfunction

Atrioventricular Block

Av Block

Right Bundle Branch Block

Right Bundle Branch Block With Left Posterior Fascicular Block

Heart Disease

Heart Failure

Congenital Heart Disease

Heart Diseases

Congenital Heart Defects

Congenital Heart Defect

Heart Malformation

Congenital Anomaly Of Heart

Heart Defect

Heart-Congenital Defect

Congenital Heart Disorder

Heart Defects Congenital

Heart Defects, Congenital

Heart Defects

Heart Disease, Congenital

Disease, Heart, Congenital

Congestive Heart Failure

Long Qt Syndrome

Romano-Ward Syndrome

Long Q-T Syndrome


Qt Syndrome, Long

Congenital Long Qt Syndrome

Familial Long Qt Syndrome

Second-Degree Atrioventricular Block

Second-Degree Heart Block

Second Degree Atrioventricular Block

Second Degree Atrioventricular Heart Block

Second Degree Heart Block

Incomplete Atrioventricular Block, Second Degree Nos

Second-Degree Block, Type 1 And 2

Atrioventricular Block, Type 1 And 2

Second Degree Incomplete Atrioventricular Block

Av - [Atrioventricular] Block 2nd

Third-Degree Atrioventricular Block

Third Degree Atrioventricular Block

Complete Atrioventricular Block

Complete Av Block

Third-Degree Block

Complete Atrioventricular Heart Block

Complete Heart Block

Third Degree Atrioventricular Heart Block

Third Degree Heart Block

Complete Heart Block Nos

Chb - [Complete Heart Block]

Idioventricular Rhythm

Av - [Atrioventricular] Block, Complete

Epilepsy, Idiopathic Generalized

Idiopathic Generalized Epilepsy

Generalised Epilepsy

Epilepsy, Generalized



Epilepsy, Idiopathic Generalized, Susceptibility To, 1

Epilepsy, Idiopathic Generalized 1

Epilepsy, Idiopathic Generalized, Susceptibility To

Epilepsy, Idiopathic, Generalized

Epilepsy, Idiopathic, Generalized, Susceptibility To, Type 1


Epilepsy Syndrome

Epileptic Syndrome


Symptomatic Epilepsies

Post Traumatic Epilepsy

Traumatic Epilepsy

Traumatic Epileptic

Epilepsy Due To Hippocampal Sclerosis

Epilepsy With Ammon'S Horn Sclerosis

Epilepsy Due To Cortical Dysplasia

Epilepsy Due To Neuronal Migration Disorders

Heart Conduction Disease

Conduction Disorder Of The Heart

Heart Rhythm Disease

Renal Tuberculosis

Tuberculosis, Renal

Tuberculosis Of Kidney

Tuberculosis Renal

Severe Congenital Neutropenia 5

Congenital Neutropenia-Myelofibrosis-Nephromegaly Syndrome

Congenital Neutropenia-Bone Marrow Fibrosis-Nephromegaly Syndrome

Vps45 Deficiency


Long Qt Syndrome 9


Long Qt Syndrome-9

Qt Syndrome, Long, Type 9

Catecholaminergic Polymorphic Ventricular Tachycardia


Catecholamine-Induced Polymorphic Ventricular Tachycardia

Familial Polymorphic Ventricular Tachycardia

Malignant Paroxysmal Ventricular Tachycardia

Multifocal Ventricular Premature Beats

Stress-Induced Polymorphic Ventricular Tachycardia

Bidirectional Tachycardia Induced By Catecholamine

Double Tachycardia Induced By Catecholamines

Polymorphic Catecholergic Ventricular Tachycardia

Syncopal Paroxysmal Tachycardia

Bidirectional Tachycardia Induced By Catecholamines


Bidirectional Ventricular Tachycardia Induced By Catecholamine

Polymorphic Ventricular Tachycardia Induced By Catecholamines

Ventricular Tachycardia, Catecholaminergic Polymorphic

Ventricular Tachycardia, Catecholaminergic Polymorphic, 1

Familial Ventricular Tachycardia

Multifocal Pvcs

Multifocal Premature Ventricular Beats

Left Ventricular Noncompaction

Noncompaction Cardiomyopathy

Left Ventricular Hypertrabeculation


Spongy Myocardium

Isolated Noncompaction Of The Ventricular Myocardium

Left Ventricular Myocardial Noncompaction Cardiomyopathy

Fetal Myocardium

Honeycomb Myocardium

Hypertrabeculation Syndrome

Left Ventricular Non-Compaction


Non-Compaction Of The Left Ventricular Myocardium

Ventricular Noncompaction, Left

Non-Compaction Cardiomyopathy

Holt-Oram Syndrome


Atriodigital Dysplasia

Heart-Hand Syndrome

Atrio-Digital Syndrome

Cardiac-Limb Syndrome

Heart-Hand Syndrome, Type 1

Ventriculo-Radial Syndrome


Heart Hand Syndrome

Atrio Digital Syndrome

Hos 1

Atriodigital Dysplasia Type 1

Heart-Hand Syndrome Type 1

Holt Oram Syndrome

Long Qt Syndrome 1

Romano-Ward Syndrome


Ward-Romano Syndrome


Ventricular Fibrillation With Prolonged Qt Interval


Long Qt Syndrome 1, Acquired, Susceptibility To

Long Qt Syndrome 1, Acquired

Romano-Ward Long Qt Syndrome

Long Qt Syndrome Type 1

Long Qt Syndrome-1

Acquired Susceptibility To Long Qt Syndrome 1

Qt Syndrome, Long, Type 1

Wolff-Parkinson-White Syndrome

Wolff-Parkinson-White Pattern

Wpw Syndrome

Anomalous Atrioventricular Excitation

Anomalous A-V Excitation

Ventricular Pre-Excitation With Arrhythmia


Ventricular Familial Preexcitation Syndrome

Preexcitation Syndrome

Ventricular Preexcitation

Wpw - [Wolff-Parkinson- White] Syndrome

Pre-Excitation Syndrome

Isolated Elevated Serum Creatine Phosphokinase Levels

Elevated Serum Cpk

Idiopathic Hyperckemia

Isolated Hyperckemia

Elevated Serum Creatine Phosphokinase


Idiopathic Persistent Elevation Of Serum Creatine Kinase

Cardiomyopathy, Familial Hypertrophic, 1

Asymmetric Septal Hypertrophy

Familial Hypertrophic Cardiomyopathy

Hypertrophic Cardiomyopathy 1


Hypertrophic Cardiomyopathy 19


Ventricular Hypertrophy, Hereditary


Hypertrophic Subaortic Stenosis, Idiopathic

Cardiomyopathy, Familial Hypertrophic

Cardiomyopathy, Hypertrophic, 1, Digenic

Cardiomyopathy, Familial Hypertrophic 1


Hereditary Ventricular Hypertrophy

Idiopathic Hypertrophic Subaortic Stenosis

Hypertrophic Cardiomyopathy

Cardiomyopathy, Hypertrophic, Familial

Cardiomyopathy, Hypertrophic, 1

Familial Asymmetric Septal Hypertrophy

Heritable Hypertrophic Cardiomyopathy


Cardiomyopathy, Hypertrophic, Familial, Type 1

Ebstein Anomaly

Ebstein'S Anomaly

Ebstein'S Anomaly Of Common Atrioventricular Valve

Ebstein'S Anomaly Of Right Atrioventricular Valve

Ebstein'S Anomaly Of Tricuspid Valve

Ebstein'S Malformation

Ebstein Malformation Of The Tricuspid Valve

Ebstein Anomaly Of The Tricuspid Valve

Ebstein Disease

Accessory Tricuspid Valve Tissue

Congenital Ebstein Deformity Of Tricuspid Valve

Ebstein Syndrome

Ebstein Cardiopathy

Ebstein Anomaly Of Tricuspid Valve

Long Qt Syndrome 2


Long Qt Syndrome, Acquired, Reduced Susceptibility To

Long Qt Syndrome 1/2

Long Qt Syndrome 2/3

Long Qt Syndrome 2/5

Long Qt Syndrome 2, Acquired, Susceptibility To

Long Qt Syndrome, Acquired, Reduced

Long Qt Syndrome Type 2

Long Qt Syndrome 2/9





Susceptibility To Acquired Long Qt Syndrome 2

Long Qt Syndrome-2

Qt Syndrome, Long, Type 2

Long Qt Syndrome 1-2

Long Qt Syndrome 2-3

Long Qt Syndrome 2-5

Long Qt Syndrome 9

Intrinsic Cardiomyopathy
Familial Atrial Fibrillation

Atrial Fibrillation, Familial


Atrial Fibrillation Autosomal Dominant

Autosomal Dominant Atrial Fibrillation

Auricular Fibrillation

Atrial Fibrillation

Atrial Fibrillation, Familial, 1

Lipoprotein Quantitative Trait Locus

Coronary Artery Disease

Coronary Artery Anomaly

Coronary Artery Disease, Susceptibility To

Myocardial Ischemia

Congenital Anomaly Of Coronary Artery

Coronary Arteriosclerosis

Coronary Disease

Coronary Heart Disease

Coronary Artery Disorder


Lpa Deficiency, Congenital

Coronary Artery Abnormality

Coronary Artery Anomaly, Congenital


Coronary Syndrome

Congenital Malformations Of Coronary Vessels

Malformation Of Coronary Vessels

Congenital Coronary Artery Anomaly

Congenital Coronary Artery Deformity

Congenital Coronary Artery Disorder

Abnormal Coronary Artery

Congenital Coronary Artery Malposition

Congenital Coronary Disease

Congenital Anomaly Of Coronary Arteries

Orthostatic Intolerance

Mitral Valve Prolapse

Neurocirculatory Asthenia

Mitral Valve Prolapse Syndrome

Irritable Heart

Systolic Click-Murmur Syndrome

Soldiers Heart

Cardiovascular Malfunction Arising From Mental Factors

Cardiovascular Neurosis

Da Costa'S Syndrome

Krishaber'S Disease

Barlow'S Syndrome

Floppy Mitral Valve

Mitral Leaflet Syndrome

Myxomatous Mitral Valve Prolapse

Postural Orthostatic Tachycardia Syndrome Due To Net Deficiency

Familial Orthostatic Tachycardia Due To Norepinephrine Transporter Deficiency

Orthostatic Intolerance Due To Net Deficiency

Pots Due To Net Deficiency


Intolerance, Orthostatic

Mitral Valve Prolapse, Familial, X-Linked

Ballooning Mitral Valve

Barlow Syndrome

Flail Mitral Leaflet

Myxomatous Mitral Valve

Mitral Valve Prolapse-Click Syndrome

Prolapsing Mitral Valve Leaflet Syndrome

Billowing Mitral Valve Leaflet

Posterior Mitral Leaflet Deformity

Ballooning Posterior Leaflet Syndrome

Blue Valve Syndrome

Floppy Mitral Valve Syndrome

Mitral Valvular Prolapse

Systolic Click Syndrome

Atrial Heart Septal Defect

Atrial Septal Defect

Atrial Septal Defects

Atrioseptal Defect

Auricular Septal Defect

Congenital Atrial Septal Defect

Interatrial Septal Defect

Interauricular Septal Defect

Heart Septal Defects, Atrial

Septal Defect, Atrial

Childhood Absence Epilepsy


Petit Mal Epilepsy

Absence Seizures

Absence Seizure

Petit Mal Seizure

Absence Epilepsy, Childhood


Epilepsy, Absence

Absence Epilepsy


Hypertrophic Cardiomyopathy

Hypertrophic Obstructive Cardiomyopathy

Cardiomyopathy, Hypertrophic

Cardiomyopathy Hypertrophic Obstructive

Cardiomyopathy, Hypertrophic, Familial

Idiopathic Myocardial Hypertrophy

Idiopathic Hypertrophic Cardiomyopathy

Obstructive Idiopathic Hypertrophic Cardiomyopathy

Obstructive Cardiomyopathy

Idiopathic Hypertrophic Subaortic Stenosis

Muscular Subaortic Stenosis

Hypertrophic Obstructive Subaortic Stenosis

Dilated Cardiomyopathy

Familial Dilated Cardiomyopathy

Primary Dilated Cardiomyopathy

Idiopathic Dilated Cardiomyopathy

Congestive Cardiomyopathy

Idiopathic Dilation Cardiomyopathy

Primary Familial Dilated Cardiomyopathy

Cardiomyopathy, Dilated


Cardiomyopathy, Familial Dilated

Dilated Cardiomyopathy, Familial

Hypokinetic Dilated Cardiomyopathy, Familial

Familial Idiopathic Cardiomyopathy


Cardiomyopathy, Familial Idiopathic

Idiopathic Cardiomegaly

Dilated Congestive Cardiomyopathy

Chronic Dilated Cardiomyopathy

Ccm - [Congestive Cardiomyopathy]

Cocm - [Congestive Cardiomyopathy]

Dcm - [Dilated Cardiomyopathy]

Dilated-Hypokinetic Cardiomyopathy

Congestive Idiopathic Cardiomyopathy

Primary Idiopathic Dilated Cardiomyopathy

Aortic Aneurysm, Familial Thoracic 1

Thoracic Aortic Aneurysm

Annuloaortic Ectasia

Familial Thoracic Aortic Aneurysm And Aortic Dissection

Familial Aortic Dissection

Familial Taad

Familial Thoracic Aortic Aneurysm

Congenital Aneurysm Of Ascending Aorta

Familial Aortic Aneurysm

Familial Thoracic Aortic Aneurysm And Dissection

Aortic Aneurysm, Thoracic



Aortic Dissection, Familial

Aortic Aneurysm, Familial Thoracic

Aneurysm, Thoracic Aortic





Cystic Medial Necrosis Of Aorta

Familial Non-Syndromic Thoracic Aortic Aneurysm And Aortic Dissection

Aortic Aneurysm Thoracic

Familial Aortic Aneurysms

Aneurysm, Aortic, Thoracic, Familial, Type 1

Aneurysm Of Thoracic Aorta

Intrathoracic Aneurysm

Thoracic Aorta Aneurysm

Thoracic Aortic Aneurysm Without Rupture

Thoracic Aneurysm

Thorax Arterial Aneurysm

Thoracic Artery Aneurysm

Thoracic Arterial Aneurysm

Thorax Aneurysm

Thorax Aortic Aneurysm

Dissection Of Thoracic Aorta

Tetralogy Of Fallot


Fallot Tetralogy

Ventricular Septal Defect With Pulmonary Stenosis Or Atresia, Dextraposition Of Aorta, And Hypertrophy Of Right Ventricle

Tetrad Of Fallot

Fallot Tetrad

Fallot Disease

Fallot Complex

Subpulmonic Stenosis, Ventricular Septal Defect, Overriding Aorta, And Right Ventricular Hypertrophy

Interventricular Septal Defect With Dextroposition Of Aorta, Pulmonary Stenosis And Hypertrophy Of Right Ventricle

Interventricular Septal Defect, In Tetralogy Of Fallot

Ventricular Septal Defect With Obstructed Right Ventricular Outflow

Tof - [Tetralogy Of Fallot]

Pulmonary Atresia With Ventricular Septal Defect [Fallot Type]

Pulmonary Atresia, Ventricular Septal Defect And Mapcas

Pulmonary Atresia With Ventricular Septal Defect And Systemic-To-Pulmonary Collateral Arteries [Fallot Type]

Amyotrophic Lateral Sclerosis 1

Amyotrophic Lateral Sclerosis


Lou Gehrig Disease

Amyotrophic Lateral Sclerosis Type 1

Charcot Disease


Amyotrophic Lateral Sclerosis, Susceptibility To


Lou Gehrig'S Disease


Motor Neuron Disease

Familial Amyotrophic Lateral Sclerosis

Amyotrophic Lateral Sclerosis 1, Familial

Amyotrophic Lateral Sclerosis 1, Autosomal Dominant

Motor Neuron Disease, Bulbar

Motor Neurone Disease

Amyotrophic Lateral Sclerosis With Dementia

Dementia With Amyotrophic Lateral Sclerosis

Motor Neuron Disease, Amyotrophic Lateral Sclerosis

Sclerosis, Lateral, Amyotrophic

Sclerosis, Lateral, Amyotrophic, Type 1

Amyotrophic Sclerosis

Als - [Amyotrophic Lateral Sclerosis]

Wasting Palsy

Amyotrophic Paralysis

Amyotrophy Lateral Sclerosis

Wasting Paralysis

Spinal Progressive Amyotrophy

Progressive Atrophic Paralysis

Diseases Alias
Waldenstroem'S Macroglobulinemia

Waldenstroem'S Macroglobulinemia

Waldenstroem'S Macroglobulinemia

Macroglobulinemia Of Waldenstrom

Lymphoplasmacytic Lymphoma With Igm Gammopathy

Lymphoplasmacytic Lymphoma

Waldenstroem'S Macroglobulinemia

Waldenstroem'S Macroglobulinemia

Macroglobulinemia Of Waldenstrom

Lymphoplasmacytic Lymphoma With Igm Gammopathy

Lymphoplasmacytic Lymphoma

Orthologs Information

Species Symbol Source ID
Rattus norvegicus HCN4 RGD RGD:71065
Bos taurus HCN4 VGNC VGNC:29779
Canis familiaris HCN4 VGNC VGNC:58306
Felis catus HCN4 VGNC VGNC:80957
Mus musculus HCN4 MGD MGI:1298209
Macaca mulatta HCN4 VGNC VGNC:73179