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A glimpse of what is possible

These are 10.
There are thousands more.

From cystic fibrosis and sickle cell disease to Huntington’s, thousands of serious inherited conditions can be traced to a known genetic change. Once a family’s variant is identified, reproductive options can help prevent it from being passed on.

10 of 6,000+ known inherited conditions and phenotypes
Explore the ten conditions
The idea, made tangible

These conditions are different.
The principle is the same.

When the change responsible for a condition is known in a family, embryos created through IVF can be tested for that specific change before transfer. This is PGT-M: selection, not gene editing.

Autosomal recessive Autosomal dominant X-linked
01Autosomal recessive
CFTR

Cystic fibrosis

A lifelong condition in which thick, sticky mucus damages the lungs, digestive system and other organs.

Gene
CFTR
Typical risk
25% when both parents are carriers
PGT-M may prevent the familial variant from being passed on.
Explore the science
02Autosomal recessive
HBB

Sickle cell disease

An inherited blood disorder that can cause severe pain, anaemia, infections and progressive organ damage.

Gene
HBB
Typical risk
25% when both parents are carriers
PGT-M may prevent the familial variant from being passed on.
Explore the science
03Autosomal dominant
HTT

Huntington’s disease

A progressive brain disorder affecting movement, thinking and mental health, usually beginning in adulthood.

Gene
HTT
Typical risk
50% when one parent carries the expansion
Specialised PGT-M pathways can test for the familial expansion.
Explore the science
04X-linked
DMD

Duchenne muscular dystrophy

A severe childhood-onset disorder that progressively weakens skeletal and heart muscle, mainly in boys.

Gene
DMD
Typical risk
50% of sons when the mother is a carrier
PGT-M may prevent the familial variant from being passed on.
Explore the science
05Autosomal recessive
SMN1

Spinal muscular atrophy

A neuromuscular condition that causes progressive weakness and can affect breathing and movement from infancy.

Gene
SMN1
Typical risk
25% when both parents are carriers
PGT-M may prevent the familial variant from being passed on.
Explore the science
06X-linked
F8·F9

Haemophilia A & B

Inherited bleeding disorders in which blood does not clot normally, causing prolonged or spontaneous bleeding.

Genes
F8 or F9
Typical risk
50% of sons when the mother is a carrier
PGT-M can test embryos for the known familial variant.
Explore the science
07X-linked
FMR1

Fragile X syndrome

A common inherited cause of intellectual disability and developmental differences, often more severe in boys.

Gene
FMR1
Mechanism
CGG repeat expansion
Specialist PGT-M can test embryos for the familial expansion.
Explore the science
08Autosomal recessive
HBB

Beta thalassaemia

A blood disorder that reduces haemoglobin production and can cause severe anaemia requiring lifelong transfusions.

Gene
HBB
Typical risk
25% when both parents are carriers
PGT-M may prevent the familial variant from being passed on.
Explore the science
09Autosomal recessive
HEXA

Tay–Sachs disease

A rare disorder in which toxic material accumulates in nerve cells; its classic form causes rapid neurological decline.

Gene
HEXA
Typical risk
25% when both parents are carriers
PGT-M may prevent the familial variant from being passed on.
Explore the science
10Autosomal recessive
PAH

Phenylketonuria

A metabolic disorder in which phenylalanine can build up and damage the brain unless carefully managed.

Gene
PAH
Typical risk
25% when both parents are carriers
PGT-M may be considered when the familial variants are known.
Explore the science
2,000+conditions approved for PGT-M by the UK regulator as of 2026

And this is only the beginning

Ten familiar names make the scale easier to see.

Jouvence’s ambition reaches across serious monogenic conditions with known causes and clinically meaningful reproductive options — not just the conditions people already recognise.

View the HFEA condition directory

What “prevent” means here.

PGT-M requires IVF and a condition-specific test. It can identify embryos that do not carry a known familial variant before transfer. It does not edit genes, guarantee pregnancy or guarantee the birth of an unaffected child. Feasibility depends on the familial variant, embryo availability, laboratory validation and the family’s circumstances.

A parent holding a young child in soft light at home.

One family at a time

Know the risk.
Choose your future.

Pre-order your test
Photography by Kimy Moto · Pexels