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Found - the gene responsible for congenital heart diseases in newborns!

Scientists have recently discovered a new gene which is believed to be linked to the congenital heart disease in new born babies, a common more commonly known as 'a hole in the heart'.

Professor Bernard Keavney, from Newcastle University and The University of Manchester, led the research which included investigators from Newcastle, Nottingham, Oxford and Leicester universities in the UK, and colleagues in Europe, Australia and Canada. Congenital heart disease (CHD) is the most common form of congenital malformation, occurring in seven in 1000 babies born and is one of the major causes of childhood death and illness. Most patients born with CHD now survive to adulthood, so identifying the responsible genes is important as experts attempt to provide individual-specific genetic counselling for these people.

The study looked at over 2,000 CHD patients and measured over 500,000 genetic markers which vary in the general population. The genetic markers in the patients were compared to the markers of over 5,600 people in good health who acted as a control group.

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The researchers found a relationship between a particular region of the human genome and risk of atrial septal defect (ASD) - a 'hole' between the heart`s blood-collecting chambers, which they went on to confirm in additional cases of atrial septal defect and healthy controls.

'We found that a common genetic variation near a gene called Msx1 was strongly associated with the risk of a particular type of CHD called atrial septal defect or hole in the heart,' Keavney said.

'ASD is one of the most common forms of congenital heart disease, and it carries a risk of heart failure and stroke. We estimated that around 10 per cent of ASDs may be due to the gene we found. We can now work to find out how Msx1 and/or its neighbour genes affect the risk of ASD,' Keavney said. Researchers looked at all the major types of congenial heart disease (CHD), but they did not find a genetic marker common in all types of CHD.

'Our work also suggests that if we conduct larger studies we will be able to find genes that cause other types of CHD. Although we are not there yet, further studies may enable us to give better genetic counselling to high risk families,' Keavney said. 'Also, when we identify genes important in the development of the heart because they have gone wrong, it helps us understand normal development better.

'Such an understanding is fundamental to any attempt to treat people with heart disease at any age - for example those suffering from heart failure - using regenerative medicine,' Keavney said.

The study was published in journal Nature Genetics.

What is congenital heart disease?

Congenital heart disease (CHD) is heart disease in the newborn, and includes structural defects, congenital arrythmias, and cardiomyopathies. CHD is a defect of the heart that exists primarily at birth, and can describe a wide variety of different abnormalities affecting the heart. CHD occurs when the heart or blood vessels near the heart does not develop properly before birth. Therefore, the heart does not pump because it is not completely developed. Also the blood flow is obstructed in the heart of the vessels nearby, causing an abnormal flow of blood through the heart. Blood flow obstructions put a strain on the heart muscle causing the heart to work harder and beat faster. Abnormal blood flow usually occurs when there is a hole in the walls of the heart and may be an abnormal connection between two arteries outside the heart.

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