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MPs have voted in favour of the creation of babies with DNA from two women and one man, in a historic move.
The UK is now set to become the first country to introduce laws to allow the creation of babies from three people.
In a free vote in the Commons, 382 MPs were in favour and 128 against the technique that stops genetic diseases being passed from mother to child.
During the debate, ministers said the technique was "light at the end of a dark tunnel" for families.
A further vote is required in the House of Lords. It everything goes ahead then the first such baby could be born next year.
Proponents said the backing was "good news for progressive medicine" but critics say they will continue to fight against the technique that they say raises too many ethical and safety concerns.
Estimates suggest 150 three-person babies could be born each year.
Prime Minister David Cameron said: "We're not playing god here, we're just making sure that two parents who want a healthy baby can have one."
Life-saving
The method, which was developed in Newcastle, should help women like Sharon Bernardi, from Sunderland, wholost all seven of her children to mitochondrial disease.
Ms Bernadi said was "overwhelmed" by the decision.
Sharon Bernardi, who lost seven children to a genetic disease: "I'm just overwhelmed"
Mitochondria are the tiny compartments inside nearly every cell of the body that convert food into useable energy. They have their own DNA, which does not affect characteristics such as appearance.
Defective mitochondria are passed down only from the mother. They can lead to brain damage, muscle wasting, heart failure and blindness.
The technique uses a modified version of IVF to combine the DNA of the two parents with the healthy mitochondria of a donor woman.
It results in babies with 0.1% of their DNA from the second woman and is a permanent change that would be passed down through the generations.
1) Two eggs are fertilised with sperm, creating an embryo from the intended parents and another from the donors 2) The pronuclei, which contain genetic information, are removed from both embryos but only the parents' are kept 3) A healthy embryo is created by adding the parents' pronuclei to the donor embryo, which is finally implanted into the womb
1) Eggs from a mother with damaged mitochondria and a donor with healthy mitochondria are collected 2) The majority of the genetic material is removed from both eggs 3) The mother's genetic material is inserted into the donor egg, which can be fertilised by sperm.
Debate
In the Commons debate, Public Health Minister Jane Ellison told the House: "This is a bold step for parliament to take, but it is a considered and informed step.
Fiona Bruce: "There will be no going back for society"
"This is world leading science within a highly respected regulatory regime.
"And for the many families affected, this is light at the end of a very dark tunnel."
Fiona Bruce, the MP for Congleton, countered: "[This] will be passed down generations, the implications of this simply cannot be predicted.
"But one thing is for sure, once this alteration has taken place, as someone has said, once the gene is out of the bottle, once these procedures that we're asked to authorise today go ahead, there will be no going back for society."
The debate in Commons also repeatedly struggled with whether the move would constitute "genetic modification".
Robert Flello, who represents Stoke-on-Trent South, said he feared "families will be let down tragically" due to the uncertainties in the technique and that society would be "up in arms" if this was a proposal for genetically modified crops.
But Frank Dobson, a former former health secretary, argued uncertainty was "the nature of medicine and science" and that IVF would not have gone ahead if absolute certainty was needed.
'Proud'
Prof Doug Turnbull, who led the team that devised the technique at Newcastle University, said: "This is an important hurdle in the development of this new IVF technique, but we still have the debate in the House of Lords, and importantly the licensing by the HFEA [the fertility regulator].
"Finally, I think the quality of the debate today shows what a robust scientific, ethical and legislative procedure we have in the UK for IVF treatments.
"This is important and something the UK should rightly be proud of."
The Chief Medical Officer, Prof Dame Sally Davies, said the UK was at the forefront of scientific development.
Analysis
By James Gallagher, Health editor, BBC News website
This is a hugely significant moment for the families involved and society as a whole.
The UK is about to become the first country to introduce laws to allow the creation of babies with DNA from three people.
For the families affected by mitochondrial disease, this is the only option for a healthy child.
While some people argue changing mitochondria is akin to a blood transplant the implications are much wider.
This is a change that will be passed down through the generations.
It also asks questions about the future.
Some people argue we are now on a slippery slope to further genetic modification of children.
Last week the Catholic and Anglican Churches in England said the idea was not safe or ethical, not least because it involved the destruction of embryos.
Other groups, including Human Genetics Alert, say the move would open the door to further genetic modification of children in the future - so-called designer babies, genetically modified for beauty, intelligence or to be free of disease.
Rachel Kean has a family history of mitochondrial disease and says the technique could be hugely beneficial
David King, from the campaign group, said: "Once you cross the ethical line, it is very hard not to take the next step of designer babies."
Dr Gillian Lockwood, a reproductive ethicist, told the BBC it was a "small change" in the legislation.
"The biggest problem is that this has been described as three-parent IVF. In fact it is 2.001-parent IVF," she said.
"Less than a tenth of one per cent of the genome is actually going to be affected. It is not part of what makes us genetically who we are.
"It doesn't affect height, eye colour, intelligence, musicality."
Safety concerns
A review by the Nuffield Council on Bioethics, as well as a public consultation by the fertility regulator, argued the creation of three-person babies was ethical.
Three scientific reviews by the Human Fertilisation and Embryology Authority (HFEA) suggest the technique is "not unsafe".
Yet some scientists argue those reviews were flawed.
Dr Ted Morrow, from the University of Sussex, believes there are still uncertainties.
"I have some concerns about the safety, I'm really not happy that the reviews have been as exemplary as other people think they are."
Prof Lisa Jardine, former chair of the HFEA, said the safety issue was a "red herring".
"All of those issues have been investigated," she said. "The scientific committees have said there is no evidence this procedure is unsafe but like all good scientists, they say it will require careful progress."
Bishop of Swindon Dr Lee Rayfield said this procedure was a "massive step" and some of his colleagues were concerned about how it was going to be regulated once approved.
"If the safeguards are there, the Church of England will be behind this," he added.
Rachel Kean, whose aunt died from mitochondrial disease, told BBC Breakfast that a yes vote would "prevent some of the cruellest and most devastating diseases, not just for the next generation but generations after".
She said there had been an "unprecedented" amount of scrutiny into the regulation and a lot of misinformation about "designer babies".
The HFEA is expected to give Newcastle a licence to carry out the procedure.
The first attempt could take place this year, which could lead to the first birth in 2016.
Source BBC News - MPs say yes to three-person babies
The UK is now set to become the first country to introduce laws to allow the creation of babies from three people.
In a free vote in the Commons, 382 MPs were in favour and 128 against the technique that stops genetic diseases being passed from mother to child.
During the debate, ministers said the technique was "light at the end of a dark tunnel" for families.
A further vote is required in the House of Lords. It everything goes ahead then the first such baby could be born next year.
Proponents said the backing was "good news for progressive medicine" but critics say they will continue to fight against the technique that they say raises too many ethical and safety concerns.
Estimates suggest 150 three-person babies could be born each year.
Prime Minister David Cameron said: "We're not playing god here, we're just making sure that two parents who want a healthy baby can have one."
Life-saving
The method, which was developed in Newcastle, should help women like Sharon Bernardi, from Sunderland, wholost all seven of her children to mitochondrial disease.
Ms Bernadi said was "overwhelmed" by the decision.
Sharon Bernardi, who lost seven children to a genetic disease: "I'm just overwhelmed"
Mitochondria are the tiny compartments inside nearly every cell of the body that convert food into useable energy. They have their own DNA, which does not affect characteristics such as appearance.
Defective mitochondria are passed down only from the mother. They can lead to brain damage, muscle wasting, heart failure and blindness.
The technique uses a modified version of IVF to combine the DNA of the two parents with the healthy mitochondria of a donor woman.
It results in babies with 0.1% of their DNA from the second woman and is a permanent change that would be passed down through the generations.
Debate
In the Commons debate, Public Health Minister Jane Ellison told the House: "This is a bold step for parliament to take, but it is a considered and informed step.
Fiona Bruce: "There will be no going back for society"
"This is world leading science within a highly respected regulatory regime.
"And for the many families affected, this is light at the end of a very dark tunnel."
Fiona Bruce, the MP for Congleton, countered: "[This] will be passed down generations, the implications of this simply cannot be predicted.
"But one thing is for sure, once this alteration has taken place, as someone has said, once the gene is out of the bottle, once these procedures that we're asked to authorise today go ahead, there will be no going back for society."
The debate in Commons also repeatedly struggled with whether the move would constitute "genetic modification".
Robert Flello, who represents Stoke-on-Trent South, said he feared "families will be let down tragically" due to the uncertainties in the technique and that society would be "up in arms" if this was a proposal for genetically modified crops.
But Frank Dobson, a former former health secretary, argued uncertainty was "the nature of medicine and science" and that IVF would not have gone ahead if absolute certainty was needed.
'Proud'
Prof Doug Turnbull, who led the team that devised the technique at Newcastle University, said: "This is an important hurdle in the development of this new IVF technique, but we still have the debate in the House of Lords, and importantly the licensing by the HFEA [the fertility regulator].
"Finally, I think the quality of the debate today shows what a robust scientific, ethical and legislative procedure we have in the UK for IVF treatments.
"This is important and something the UK should rightly be proud of."
The Chief Medical Officer, Prof Dame Sally Davies, said the UK was at the forefront of scientific development.
Analysis
By James Gallagher, Health editor, BBC News website
This is a hugely significant moment for the families involved and society as a whole.
The UK is about to become the first country to introduce laws to allow the creation of babies with DNA from three people.
For the families affected by mitochondrial disease, this is the only option for a healthy child.
While some people argue changing mitochondria is akin to a blood transplant the implications are much wider.
This is a change that will be passed down through the generations.
It also asks questions about the future.
Some people argue we are now on a slippery slope to further genetic modification of children.
Last week the Catholic and Anglican Churches in England said the idea was not safe or ethical, not least because it involved the destruction of embryos.
Other groups, including Human Genetics Alert, say the move would open the door to further genetic modification of children in the future - so-called designer babies, genetically modified for beauty, intelligence or to be free of disease.
Rachel Kean has a family history of mitochondrial disease and says the technique could be hugely beneficial
David King, from the campaign group, said: "Once you cross the ethical line, it is very hard not to take the next step of designer babies."
Dr Gillian Lockwood, a reproductive ethicist, told the BBC it was a "small change" in the legislation.
"The biggest problem is that this has been described as three-parent IVF. In fact it is 2.001-parent IVF," she said.
"Less than a tenth of one per cent of the genome is actually going to be affected. It is not part of what makes us genetically who we are.
"It doesn't affect height, eye colour, intelligence, musicality."
Safety concerns
A review by the Nuffield Council on Bioethics, as well as a public consultation by the fertility regulator, argued the creation of three-person babies was ethical.
Three scientific reviews by the Human Fertilisation and Embryology Authority (HFEA) suggest the technique is "not unsafe".
Yet some scientists argue those reviews were flawed.
Dr Ted Morrow, from the University of Sussex, believes there are still uncertainties.
"I have some concerns about the safety, I'm really not happy that the reviews have been as exemplary as other people think they are."
Prof Lisa Jardine, former chair of the HFEA, said the safety issue was a "red herring".
"All of those issues have been investigated," she said. "The scientific committees have said there is no evidence this procedure is unsafe but like all good scientists, they say it will require careful progress."
Bishop of Swindon Dr Lee Rayfield said this procedure was a "massive step" and some of his colleagues were concerned about how it was going to be regulated once approved.
"If the safeguards are there, the Church of England will be behind this," he added.
Rachel Kean, whose aunt died from mitochondrial disease, told BBC Breakfast that a yes vote would "prevent some of the cruellest and most devastating diseases, not just for the next generation but generations after".
She said there had been an "unprecedented" amount of scrutiny into the regulation and a lot of misinformation about "designer babies".
The HFEA is expected to give Newcastle a licence to carry out the procedure.
The first attempt could take place this year, which could lead to the first birth in 2016.
Source BBC News - MPs say yes to three-person babies
