The parents of a British boy who suffers from a potentially fatal genetic disorder have been told they can use IVF to create a sibling whose cells could cure him.
Shahana and Raj Hashmi, from Leeds, were seeking permission from the Human Fertilisation and Embryology Authority to ensure their next child could provide their son Zain with a viable bone marrow transplant.
A spokesman for the HFEA said a procedure known as pre-implantation genetic diagnosis (PGD) can go ahead.
The Hashmi family want to create a child who would be a suitable donor for Zain, who suffers from thalassaemia - a rare blood disorder.
In a statement, the authority said: "The HFEA approves tissue typing in conjunction with pre-implantation genetic diagnosis in the Hashmi case.
"They took this decision in the light of the knowledge that the Hashmis wish to have another child free from the genetic disease which affects their son Zain. They also hope that the new baby's cord blood can be used to attempt to save his life.
Ms Ruth Deech, chairman of the HFEA, said: "As we said in December, we will approve applications only after rigorous examination of the ethical and medical implications of the treatment and the welfare of the children.
"The authority will only approve the treatment in very rare circumstances and under strict controls."
PA