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Individuals with Marfan Syndrome usually have fingers that are longer than those that do not have the syndrome. The extremity of difference in finger length is a result of variable expressivity. Some common syndromes that involved phenotypic variability due to expressivity include: Marfan syndrome, Van der Woude Syndrome, and neurofibromatosis.
Marfan syndrome (MFS) is a multi-systemic genetic disorder that affects the connective tissue. [ 6 ] [ 7 ] [ 1 ] Those with the condition tend to be tall and thin, with long arms, legs , fingers, and toes . [ 1 ]
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The following is a list of genetic disorders and if known, type of mutation and for the chromosome involved. Although the parlance "disease-causing gene" is common, it is the occurrence of an abnormality in the parents that causes the impairment to develop within the child.
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Autosomal dominant A 50/50 chance of inheritance. Sickle-cell disease is inherited in the autosomal recessive pattern. When both parents have sickle-cell trait (carrier), a child has a 25% chance of sickle-cell disease (red icon), 25% do not carry any sickle-cell alleles (blue icon), and 50% have the heterozygous (carrier) condition. [1]
Marfan syndrome: 1 in 4,000 [14] Huntington's disease: 1 in 15,000 [15] Autosomal recessive Sickle cell anaemia: 1 in 625 [16] Cystic fibrosis: 1 in 2,000 Tay–Sachs disease: 1 in 3,000 Phenylketonuria: 1 in 12,000 Autosomal recessive polycystic kidney disease: 1 in 20,000 [17] Mucopolysaccharidoses: 1 in 25,000 Lysosomal acid lipase ...
Dennie–Marfan syndrome is a syndrome in which there is association of spastic paraplegia of the lower limbs and mental retardation in children with congenital syphilis. [1] Both sexes are affected, and the onset of the disease can be acute or insidious, with slow progression from weakness to quadriplegia .