Should my hereditary disability stop me having a baby?

For Jono Lancaster, who has Treacher Collins syndrome, the decision about whether to have a baby or not is agonising.

At the age of 26, Jono is happy with how he looks, but the genetic disorder that affected the way his facial bones developed in the womb has caused him years of anguish.

His condition means he has no cheekbones - so his eyes droop downwards - and he has problems with his hearing, so has a bone-anchored hearing aid.

It has resulted in years of bullying, several operations and numerous hospital visits. It also led his parents to give him up for adoption 36 hours after he was born.

But perhaps the most vital factor for Jono and his long-term girlfriend, 20-year-old Laura Richardson, is that it is also hereditary, so any child Jono fathers naturally has a 50% chance of having Treacher Collins.

Jono says until he met Laura, he always assumed he would adopt.

"It worked really well for me, and giving a child a second chance, I think that's brilliant.

"But Laura thinks she will have those instincts of really wanting to carry a child, and she's worried that she might find it hard to look after someone else's child - or that the child will just want to find its natural parents.

"Plus she really wants our child to be 'our' child. And I really want to look after her when she is pregnant, for her to be on the sofa, or for me to run downstairs at 2am when she fancies a pickle."

He says ruling out children is not an option.

"I've always dreamed of being a daddy. I crave father and son moments - my adoptive mum was absolutely amazing but I never had a father figure in my life, and that's something I really, really want. I want to do the school run, take my child to dance, gymnastics or football - whatever they want."

But for the couple - and particularly Jono - the thought of having a child naturally opens a minefield of morals, emotions and self-questioning.

"Knowing that there's a good chance of passing your condition on to your child. It scares me and I question whether it's the right thing to do.

"The big debate in my head is how can I knowingly put my own child through potential suffering," he says.

To add to their predicament, Treacher Collins syndrome - which is thought to affect up to one in 10,000 people in the UK - varies in severity, but there is no way of predicting how severely a child will be affected.While some sufferers have problems with hearing and facial features, others can be born unable to breathe.

"I've met a girl that needed a tracheotomy and 24-hour care, and another boy had to have his jaw extracted - which means putting a brace on every morning and and twisting it, which breaks the jaw - how can I knowingly put a child through that? I'd feel so guilty."

But Jono says if they decide to have a child naturally, "abortion is not an option" for him.

"I want to make the right decision. Right from the very start. So if I decide to have a child naturally, we go through the whole thing. Not just give up on it halfway through."

Because doctors have been able to locate Jono's abnormal gene, the final option that Jono and Laura are considering is IVF with pre-implantation genetic diagnosis (PGD).