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REVIEW ARTICLE
Year : 2005  |  Volume : 11  |  Issue : 1  |  Page : 14-23
 

An understanding the genetic basis of congenital heart disease


Department of Studies in Zoology, Human Genetic Laboratory, University of Mysore, Manasagangothri, Mysore - 570 006, India

Correspondence Address:
Nallur B Ramachandra
Department of Studies in Zoology, University of Mysore, Manasagangothri, Mysore - 570 006
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6866.16289

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   Abstract 

The recent exponential increase in the knowledge of genetics has revolutionized the understanding of congenital heart diseases (CHDs) during the past few decades. Prior studies have reported the influence of Mendelian disorders on CHDs to be very small, when compared to the polygenic inheritance, which constituted a higher percentage. The recent findings of candidate genes responsible for CHDs have provided new insights into the genetic basis of heart malformation. Here we reviewed the understandings of different types of heart lesions associated with syndromes for which genetic etiologies are apparent, as well as the recent developments involving the molecular pathways involved in CHDs in case of human beings. The similar mutations, which are the devastating events of molecular mechanism, may be the cause of different types of CHDs indicating single gene defects as the cause of different apparent phenotypes. An integrated simple model will explain the causes of presently well known CHDs. This review provides updated information on the genetic basis for cardiac defects which helps to understand, identify, prevent and treat individuals who might be at risk at an early stage. There is a need to find heart defects as early as possible so that they can be treated while the heart is still forming.


Keywords: Congenital heart disease, Syndrome, Chromosome, GATA 4, NKX- 2.5, Transcription factors


How to cite this article:
Ramegowda S, Ramachandra NB. An understanding the genetic basis of congenital heart disease. Indian J Hum Genet 2005;11:14-23

How to cite this URL:
Ramegowda S, Ramachandra NB. An understanding the genetic basis of congenital heart disease. Indian J Hum Genet [serial online] 2005 [cited 2017 Mar 28];11:14-23. Available from: http://www.ijhg.com/text.asp?2005/11/1/14/16289



   Introduction Top


Congenital heart diseases (CHDs) are the most common of all birth defects and are the leading cause of mortality in the first year of life. It has been well established that abnormal heart development is the major cause of the disease, which is mainly due to the combined effect of one or more genes interacting with various environmental risk factors. The development of the heart involves a series of collective molecular and morphogenetic events. Any deviation from the normal course, results in a disastrous form of disease.[1] The complexity inherent in heart development is reflected on the expression of myriads of genes. Candidate genes that play critical functions at specific stages of cardiac development are emerging from studies in vertebrate and invertebrate model organisms, providing possible cause for various forms of CHDs in human beings.[1],[2] The recent discovery that dominant inherited transcription factor mutations cause CHDs has brought direct medical relevance to the study of cardiac transcription factors in heart development.[3] This review focuses on the understandings of the different types of CHDs with some of the associated chromosomal syndromes and the recent developments involving the genetics of CHDs in human beings.


   Incidence Top


CHDs are the most common single group of congenital abnormalities accounting for about 30% of the total abnormalities.[4] In most patients, CHDs occur as an isolated malformation, but also about 33% have associated anomalies.[5] World wide CHDs in children continues to be a major public problem with the incidence in different studies varying from 1-17.5/1000 live births [Table - 1] and 10% of spontaneously aborted fetus.[6] The available data on CHDs in India shows an incidence of 1-5/1000 live births.[7],[8]

Classification of CHDs

The CHDs could take place in any side of the heart: Atrial, ventricular or vascular. The common defects are classified according to: a) side of the affected heart, b) communication or short circuit between both hearts chambers and c) Presence or absence of cyanosis.[9] [Figure - 1] presents the schematic diagram of normal heart, which will help to understand different types of CHDs. According to the Merck manual of Diagnosis[10] the first eight CHDs are the common lesions, which account for 85% of all cases and the remaining (15%) account for variety of rare and complex CHDs.

(1) Atrial Septal Defect (ASD): A septal defect is a hole in different part of the atrial septum which lets some amount of blood from the left atrium to right atrium instead of flowing into left ventricle. It may be single or multiple and can be located anywhere in the atrial septum. Based on this, the ASDs are classified into 3 major types depending on the different part of the septum: a) Ostium secundum (Fossa ovalis), b) Ostium primum and c) Sinus venosum defect.

(2) Ventricular Septal Defect (VSD): A septal defect is a hole, existing between the lower chambers of the heart. Oxygen rich blood from the lungs is pumped into the aorta from the left ventricle. During this process with VSD some amount of blood is passed into the right ventricle and into the pulmonary artery back to the lungs. As the heart has to pump extra blood and is overworked it might transform the septum into a honey combed Swiss cheese structure with sieve like fenestrations. It is classified into 2 main types according to their location relative to the components of the septum. The common types are perimembranous and trabecular.

(3) Patent Ductus Arteriosus (PDA): Ductus arteriosus, the temporary duct connecting the left pulmonary artery to the aorta in the fetal heart, fails to close after birth. This allows blood to mix between the pulmonary artery and the aorta, which results in too much blood traveling to the lungs.

(4) Pulmonary Stenosis (PS): Narrowing of the pulmonary valve between right ventricle and the pulmonary artery is called pulmonary stenosis. This results in the right ventricle pumping harder than normal to overcome the obstruction.

(5) Aortic Stenosis (AS): Narrowing of the aortic valve between the left ventricle and the aorta is called aortic stenosis. Normally there are 3 leaflets or cups in a valve, but in a stenotic valve there is one (unicuspid) or two (bicuspid). Obstruction may be valvular, subvalvular (sub aortic) or supra valvular. This makes it hard for the heart to pump blood to the body.

(6) Coarctation of the aorta (COA): It is a constricted segment of the aorta that obstructs blood flow to the lower part of the body and increases blood pressure above the constriction. It usually occurs as isolated disease, but may occur with a VSD, sub aortic stenosis or complex CHDs.

(7) Tetralogy of Fallot (TOF): TOF is made up of 4 separate components: a) VSD, that lets blood pass from the right to the left ventricle without going through the lungs and b) a narrowing (stenosis) at or just beneath the pulmonary valve. This narrowing partially blocks the blood flow from the right side of the heart to the lungs. c) The right ventricle is more muscular than normal, and d) the aorta lies directly over the VSD. Collectively, this results in cyanosis or blue baby, which may appear soon after birth, in infancy or later in childhood.

(8) Transposition of the great arteries (TOA): The great arteries are pulmonary artery and the aorta. The normal positions of the arteries are reversed in this type of defect. The aorta is connected to the right ventricle, while the pulmonary artery is connected to the left ventricle. This results in the right ventricle pumping oxygen poor blood to different parts of the body and the left ventricle pumping oxygen rich blood to the lungs. This defect is commonly associated with VSD, PS, heart block and an Ebstein like malformation of the tricuspid valve, which helps in communicating the oxygen rich blood to different parts of the body.

(9) Atrioventricular Septal Defect (AVSD): A large hole in the centre of the heart exists where the wall between the upper chambers joins the wall between the lower chambers. This is called as a complete AVSD. In case of partial AVSD, either the upper or the lower part of the septum is affected. In addition, the tricuspid and mitral valves that normally separate the hearts upper and lower chambers are not formed as individual valves; instead, a single large valve is formed. This large opening in the centre of the heart lets blood to flow in all direction inside the heart.

(10) Persistent truncus arteriosus: It is a complex malformation where only one artery arises from the heart and forms the aorta and pulmonary artery. That means the pulmonary arteries then branch off this common artery. This defect is found in association with VSD.

(11) Tricuspid Artesia (TA): The valve between the right atrium and the right ventricle is missing. As a result, oxygen-poor blood is pumped into the body along with the oxygen-rich blood. This results in cyanosis or blue baby. This defect is found in association with ASD, VSD and PDA.

(12) Pulmonary Artesia (PA): In this case no pulmonary valve exists; therefore blood cannot flow from the right ventricle into the pulmonary artery and on to the lungs. The only way for the blood to reach the lungs is the ductus arteriosus which is found during the fetal condition which closes after birth. The mixing of oxygen rich blood and oxygen poor blood results in cyanosis.

(13) Total anomalous pulmonary venous connection (TAPVC): In this case, all the pulmonary veins drain into the right atrium instead of left atrium, which brings the mixing of the blood. In addition to this, there is also presence of ASD and VSD, which results in cyanosis. There are three main types of TAPVC, depending on where the pulmonary veins drain. They are referred to as supracardiac, intracardiac, and infracardiac.

(14) Hypoplastic left heart syndrome (HLHS): In this condition the left ventricle and the aorta are small and underdeveloped. Therefore, the mitral and aortic valves are usually tiny or absent. It is one of the top three heart abnormalities to cause problems in the newborn.

(15) Double outlet right ventricle (DORV): It is a most uncommon defect in which both the pulmonary artery and aorta arises from the right ventricle, each with its own outflow tract and valve.

(16) Single ventricle / univentricular heart: It refers to a congenital malformation in which two atria are related to one ventricle that qualifies as left, right or indeterminate ventricle on purely morphologic ground.

(17) Ebstein's anomaly (EA): In this case there is a downward displacement of the tricuspid valve into the right ventricle. It is usually associated with an ASD.

(18) Dextrocardia (heart on the right): If the developing heart tube bends to the left instead of the right, then the heart is displaced to the right and develops in a mirror image of its normal state. This is a condition called situs inversus. In many a cases Dextrocardia heart functions normally unless there are no associated vascular abnormalities. In cases where the heart is the only organ, which is transposed, known as isolated Dextrocardia, there are usually other severe cardiac abnormalities associated with it.

[Table - 2] provides incidence of various types of CHDs in the world population, which indicates that VSD, ASD and PDA are more prevalent both at National and International level.

Despite a large number of cardiac diseases that exist, there are only a limited number of physiological disturbances that can be produced. It is usually present in infancy as i) Symptomatically with cyanosis, congestive heart failure, shock, Arrhythmias, ii) Asymptomatically with heart murmur and iii) Others which includes different respiratory tract infections and growth failure.

The diagnosis of CHDs includes careful physical and cardiovascular examination, chest radiography, electrocardiography, echocardiography, cardiac catheterization, cineangiography and cardiac MRI.[11]

Etiology

Most of the congenital heart defects are sporadic. The major genetic cause for congenital heart defects includes the following: (a) chromosomal disorders and single gene disorders constituting 8% (b) 2% of environmental teratogens and (c) 90% multifactorial disorders.[12] A multifactorial means both genetic and environmental factors interact, to interfere with the development of the heart. Increased incidence of CHDs has been noted with intrauterine viral infections, maternal drug and alcohol consumption during first trimester of pregnancy and pregnancy-induced systemic maternal disease.[13] Although most CHDs occur as a sporadic event, many diseases are part of a well-defined genetic basis.[12],[14] In addition to Mendelian disorders, certain types of CHDs are associated to single gene or single locus defects.


   Chromosomal anomalies Top


The association of CHDs with chromosomal anomalies varies between 4-12%.[15] The following are some of them:

(a) Trisomy 21 (Down syndrome): This chromosomal defect has the highest association with major heart abnormalities. At least 40% of Trisomy 21 children will have heart disease; furthermore, 50% of those children with heart abnormalities will specifically be affected with AVSD.[16]

(b) Trisomy 18 (Edwards Syndrome): This is the second most common autosomal aneuploidy after Down syndrome. Common CHDs include VSD, AVSD, double outlet right ventricle, and hypoplastic left heart.[17]

(c) Trisomy 13 ( Patau syndrome More Details): Many die in the neonatal period with this syndrome. Common CHDs include ASD, VSD, PDA and cardiac malpositions especially Dextrocardia (6%).[18]

(d) 45 X (Turner Syndrome): About 10% of girls with this syndrome have a clinically evident heart defect and a further 10% will display cardiac disease on echocardiography.[19] Common CHDs include VSD, COA, bicuspid aortic valve, hypoplastic left heart, mitral valve prolapse, and idiopathic aortic root dilatation.[20]

(e) Tetrasomy 22q (cat eye syndrome): The important features of this syndrome are iris colobomata, ear tags and imperforate anus. The CHDs association is found to be 30% of the patients with total anomalous pulmonary venous drainage as major problem.[21]

(f) Tetrasomy 12q (pallister killian syndrome): This is associated with mosaicism of chromosome. The CHDs association is found to be 25% of the patients that includes VSD, COA, PDA, ASD, and AS.[22]

(g) Fragile -X Syndrome: It is caused by a trinucleotide repeat expansion (CGG) in the fragile X mental retardation gene ( FMR1) at Xq27.3.[23] Cardiac disease include mitral valve prolapse, which can be seen in up to 50% of adult patients with Fragile X syndrome. There are also incidences of mild dilation of aortic root in adults.[24]

(h) Chromosome Deletion and duplication Syndromes: Congenital heart lesions are common in most of the macro deletion syndromes and the cardiac anomalies vary widely even in those with apparently identical deletion breakpoints. It includes 3q, 4q, 5p, 8p, 9p, 11q, 13q, 18p, and 18q deletion syndromes.[24] There are an equal number of duplication syndromes that also can be present with multiple congenital malformation and cardiac lesions such as 1p, 2p, 2q, 2p, 5p, 8p, 13q and 16q duplication syndromes.[24] Many affected children have a combination of deletions and duplications involving the respective chromosome segments that were involved in the rearrangement. Some of them are:

(i) Deletion 22Q11.2 syndrome: It comprises of 3 major syndromes: DiGeorge Syndrome (DGS), Velo cardio Facial syndrome (VCFS) and Conotruncal anomaly face syndrome (CTAFS). Clinically these syndromes have overlapping phenotypes. The land marking features of Digeorge syndromes are heart abnormalities, trouble with calcium level, immune system problems due to the small size or absence of the thymus and or parathyroid. The important features of velocardiofacial syndrome are cleft palate, heart disease, learning disabilities and a characteristic facial appearance. CATCH 22 is the medical acronym of 22q11 deletion syndrome (which stands for Cardiac defect, Abnormal face, Thymic hypoplasia, Cleft palate and Hypocalcemia 22q11.2 deletion). Individuals with this syndrome have a range of findings, including CHDs particularly conotruncal malformations (TOF, IAA, and TA); palatal abnormalities (velopharyngeal incompetence), sub mucosal cleft palate as well as cleft palate; and learning difficulties. The incidence of this syndrome is 1 in 4500 live births. It is sporadic in ~ 90% of the cases. This deletion is ~ 3Mb long in 90% of the patients and 1.5 Mb in 10% of cases. It is estimated to encompass ~30 genes. It has also been reported that UFD1L gene is not the only target in chromosome 22q11 syndromes for CHDs.[25] Since the recent mouse studies of TBX1 haploinsufficiency have established TBX1 contribution to conotruncal development, it has been hypothesized that human TBX1 haploinsufficiency via chromosome 22q11 deletion plays a major role in human DGS/ VCFS conotruncal disease.[26] Less than 1% of patients with clinical findings of the 22q11.2 deletion syndrome have a translocation between chromosome 22 and 11.[27],[28] Standard karyotypic analysis, even with high-resolution banding techniques will only detect 10-20% of 22q11 deletions. Currently, FISH is the method of choice for microdeletion detection.[29]

(ii) Wolf-hirschhorn syndrome: This syndrome is due to deletion of terminal segment of chromosome 4p.[30] There is increased incidence of cleft lip, palate, seizures and heart disease (30%).[31]

(iii) 1q21 Microdeletions: Microdeletion on chromosome 1q21.1 spanning between 1.5 to 3Mb has been reported to be associated with CHDs, particularly anomalies of aortic arch.[32]

Other Major "Cardiac" Syndromes

(a) Noonan syndrome: Children with this syndrome have specific features such as valvar pulmonary stenosis, short stature, mild learning difficulties, and dysmorphic appearance. The cardiac disease seen in this syndrome includes PS,[33] ASD, PDA, VSD and asymmetric septal hypertrophy.[34]

(b) Kabuki syndrome: It is characterized by distinct facial anomalies, variable degrees of mental retardation, CHDs and skeletal malformation. The CHDs include ASD, VSD, TOF, PDA, TGA, aortic Coarctation, single ventricle with common atrium and right bundle branch block.[35]

(c) Ellis- van Creveld: It shows skeletal dysphasia characterized by short limbs, short ribs, postaxial polydactyly, dysplastic nails and teeth.[36] CHDs occur in 60% of affected individuals that are disease in primary atrial septation; single atrium and Hypoplastic left heart syndrome.[37]


   Gene mutations Top


At present, very few candidate genes have been identified which cause CHDs in human beings, partly because of lack of large pedigrees segregating a well defined type of CHDs. Some of them are presented in [Table - 3].

(1) CSX/ NKX2.5: The earliest molecule marker of the cardiac lineage is NKX2.5 in vertebrates. It is one of the members of NK2 family of homeobox genes and a homolog of the Drosophila tinman . It has highly conserved regions of DNA binding, protein-protein interactions, nuclear translocation, and regulation of other transcription factors. Their homeodomains have a tyrosine at position 54, making it the most unambiguous feature of this class and is a useful classification tool. Homeobox genes have been found to play a crucial role in regulating tissue specific gene expression. Mutations in this gene have been reported [Table - 4] to cause ASD, VSD with atrial ventricular block, TOF and Tricuspid valve abnormalities.[38],[39],[40]

(2) GATA4: The heart disease critical region is a 10cM segment defined by markers distally, D8S1706 and proximally, D8S1759. This region harbors GATA4, a transcription factor which is a member of the GATA family that is zinc finger proteins. The proteins in the GATA family recognize a specific consensus sequence (A/TGATAA/G) and is known as the "GATA" motif. The mutation in GATA4 gene [Table - 4] diminishes DNA-binding affinity and transcriptional activity. GATA4 is capable of synergizing with other transcription factors such as NKX2.5, dHAND and TBX5 to activate cardiac-specific gene expression.[41],[42]

(3) TBX5: TBX5 is a T-box containing transcription factor expressed early in heart development.[1] In humans missense mutations, which disrupt the 5' end of the T-Box, have more severe cardiac effects than missense mutations at 3' end of the T-Box.[42],[43] Holt-Oram syndrome is a developmental disorder affecting the heart and upper limbs caused by mutation in the TBX5. The range of cardiac abnormalities include atrioventricular blocks, failure of septa formation, HLHS, AS, mitral valve prolapse, TOF, secundum ASD, VSD, AVSD, and TA.[44]

(4) dHAND/eHAND: Human dHAND and eHAND are two related basic helix-loop-helix transcription factors that are expressed in a complementary fashion in the developing right and left ventricles, respectively. They are also expressed in the neural crest-derived cardiac outflow tract and aortic arch arteries. dHAND mutations exhibit hypoplasia of the right ventricle, branchial arches, and aortic arch arteries.[45] dHAND expression was observed in all four chambers of the healthy human heart. In contrast eHAND was expressed in the right and left ventricles but down regulated in both atrial chambers.[46]

(5) IRX4 (Iroquois homeobox gene 4): Human IRX4 which is present in the developing central nervous system, skin, and vibrissae, but are predominantly expressed in the cardiac ventricles. This Homeobox gene is likely to be an important mediator of ventricular differentiation during cardiac development, which is downstream of NKX2.5 and dHAND.[47]

(6) JAGGED-1: It is a Notch Ligand, expressed in the developing right heart. Missense mutation (G274D) in JAGGED-1, causes defect in all forms of TOF. Mutation in JAGGED-1 has also been identified in patients with Alagille syndrome.[48]

(7) Elastin: A mutation of Elastin causes supravalvular aortic stenosis and peripheral pulmonary artery stenosis. This mutation is also associated with William syndrome.[49]

(8) TFAP2B: It is expressed in the neural crest. This mutation was observed in families with PDA, hand anomalies and facial dysmorphism.[50]

(9) Fibrillin: Mutation in this gene causes cardiac disease that include dilation of ascending aorta, mitral valve prolapse and dilation of pulmonary artery.[51],[52]


   Conclusion and Future prospects Top


Heart development, is early in the embryo leading to significant mortality and morbidity affecting the clinical outcome of the affected individuals. This review firstly provides an understanding of different types of heart lesions clinically. Secondly it provides information which shows a significant incidence of heart defects and chromosomal abnormalities having extra cardiac anomalies and thirdly the similar mutations which are the devastating events of molecular mechanism may be the cause of different types of CHDs indicating the involvement of single gene defects.

In order to explain the causes of CHDs we have created a simple integrated model [Figure - 2]. The major components involved in CHDs are environmental factors, mutations in chromosomes and genes. This model will help us to delineate the complex CHDs, wherein it explains how a single gene is responsible for various types of CHDs phenotypes as well as how a single CHD is caused by the involvement of different genes. If one look into the functions of these genes and their products one can clearly follow the pathways how CHDs are formed.

Finally, the completion of the human genome project has provided a range and depth of information never before imagined. It has brought lot of importance and challenge to understand the genetic disease. Further challenges include utilizing this emerging genetic information to improve diagnosis and treatment of children with CHDs, and harnessing the power of genomics to analyze isolated heart disease with complex inheritance patterns. We need to extend the ability of physicians to find heart defects as early as possible so that, they can be treated while the heart is still forming. It is expected that once we identify specific genetic basis for cardiac defects it should be possible to identify and treat individuals who might be at risk at an early stage.

As we enter the post genomic era, the enormous information about the types of CHDs, its association and the causes, available will enable us to understand one of the most complex disorders that are CHDs.


   Acknowledgments Top


We are thankful to Head and members of Paediatric Department in different hospitals at Mysore; Prof. H. A. Ranganath, and Chairman of Department of Zoology, University of Mysore; Mr. Harshvardhan. M. Gawde and Dr. Mikhil. N. Bamne, Mumbai for their cooperation, help and encouragement.

 
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    Figures

[Figure - 1], [Figure - 2]

    Tables

[Table - 1], [Table - 2], [Table - 3], [Table - 4]


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    Abstract
    Introduction
    Incidence
    Chromosomal anom...
    Gene mutations
    Conclusion and F...
    Acknowledgments
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