Scientists in Hong Kong have shed new light on why cell repair is less efficient in older people after a breakthrough discovery on premature aging, a rare genetic disease that affects one in four million babies.Premature aging, or Hutchison-Gilford Progeria Syndrome (progeria), is obvious in the appearance of a child before it is a year old. Although their mental faculties are normal, they stop growing, lose body fat and suffer from wrinkled skin and hair loss.Like old people, they suffer stiff joints and a buildup of plaque in arteries which can lead to heart disease and stroke. Most die of cardiovascular diseases before they are 20.In 2003, a team of scientists in the United States found that progeria was caused by mutation in a protein called Lamin A, which lines the nucleus in human cells.A team at the University of Hong Kong, led by Zhou Zhongjun, took the research a step further in 2004 and found that mutated Lamin A actually disrupted the repair process in cells, thus resulting in accelerated aging.The study was published in the July issue of the Nature Medicine journal.
