Monogenic disease

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A monogenic disease is caused by a defect or [[Mutation|mutation]] in a single gene. They can be Dominant, Recessive or X-linked.  
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A monogenic disease is caused by a defect or [[Mutation|mutation]] in a single [[gene|gene]]. They can be [[Dominant|Dominant]], [[Recessive|Recessive]] or [[X-linked|X-linked]].  
  
[[Dominant|Dominant]] diseases (e.g. Huntington's) are monogenic disorders where there is damage to only <u>'''one'''</u> [[Allele|allele]].  
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[[Dominant|Dominant]] diseases (e.g. [[Huntington's Disease|Huntington's]]) are monogenic disorders where there is damage to only <u>'''one'''</u> [[Allele|allele]].  
  
 
[[Recessive|Recessive]] diseases such as [[Cystic fibrosis|Cystic Fibrosis]], are monogenic disorders that occur due to damages in <u>'''both'''</u> [[Allele|alleles]].  
 
[[Recessive|Recessive]] diseases such as [[Cystic fibrosis|Cystic Fibrosis]], are monogenic disorders that occur due to damages in <u>'''both'''</u> [[Allele|alleles]].  
  
X-linked diseases (e.g. Duchenne Muscular Dystrophy) are caused by mutations on an [[X chromosome|X chromosome]] (NB women have XX, men have XY)  
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X-linked diseases (e.g. [[Duchenne Muscular Dystrophy|Duchenne Muscular Dystrophy]]) are caused by mutations on an [[X chromosome|X chromosome]] (N.B. women have XX, men have XY)  
 
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Although relatively rare, monogenic diseases affect millions of people world wide <ref name="World Health Organisation">http://www.who.int/en/</ref>&nbsp;as the condition can be passed on to subsequent generations.&nbsp;  
 
Although relatively rare, monogenic diseases affect millions of people world wide <ref name="World Health Organisation">http://www.who.int/en/</ref>&nbsp;as the condition can be passed on to subsequent generations.&nbsp;  
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=== References ===
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Revision as of 17:03, 21 October 2012

A monogenic disease is caused by a defect or mutation in a single gene. They can be Dominant, Recessive or X-linked.

Dominant diseases (e.g. Huntington's) are monogenic disorders where there is damage to only one allele.

Recessive diseases such as Cystic Fibrosis, are monogenic disorders that occur due to damages in both alleles.

X-linked diseases (e.g. Duchenne Muscular Dystrophy) are caused by mutations on an X chromosome (N.B. women have XX, men have XY)

Although relatively rare, monogenic diseases affect millions of people world wide [1] as the condition can be passed on to subsequent generations. 

References

  1. http://www.who.int/en/




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