Cystic Fibrosis

2. Death before reaching age 30 years.

1. All ethnic groups and geographic locations.

2. Most common in Caucasians (1 per 2500 newborns).

1. European folklore, clinical description, diagnosis.

1. Positional cloning, negative gene map, marker.

B. Gene product elucidation (CFTR).

1. Glycoprotein chloride channel.

2. Missense, nonsense, frameshift, splicing mutations.

3. Specific ethnic variations and geographic trends.

4. Cystic fibrosis phenotypic subtypes.

1. Antibiotics, enzymes, transplantation.

2. Deoxyribonuclease, amiloride, nucleotides.

Cystic Fibrosis is a genetic disorder which affects children and young adults. Inheritance of the mutant gene may result in chronic pulmonary, pancreatic, and liver disease, as well as other disorders. Because the condition is fairly common, it has received considerable attention. Cellular physiologic and molecular genetic discoveries in recent years have provided considerable information regarding cystic fibrosis' various dimensions. Still,

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Moreover, they also found an open reading frame segment which they could demonstrate in lower species. This indicated that they were near an important conserved DNA segmentand, quite possibly, the gene itself. Later, the researchers were able to demonstrate functional RNA corresponding to a particular segment found in CFaffected secretory tissues. The third bit of evidence for the discovery of the CF gene consisted of a deletion of three base pairs coding for phenylalanine. This deletion was confined solely to CF victims and carriers (12:727). On the September 8, 1989 the researchers published a description of the CF gene. The polypeptide encoded by the gene they called the "cystic fibrosis transmembrane conductance regulator" (CFTR). The CFTR gene is large. It spans about 230 kilobases of genomic DNA (5:738). Located on chromosome 7's band q3131, the gene is made up of 27 exons. These exons are numbered 1 to 24, but also include 6a and 6b, 14a and 14b, and, finally, 17a and 17b. Most of the 27 exons are between 50 and 250 base pairs in length. Only exon 13 is longer; it consists of 723 base pairs (5:738). The gene's RNA is eventually spliced to form a messenger RNA (mRNA) of 6500 base pairs. The cloning and s
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Approximate Word count = 3961
Approximate Pages = 16 (250 words per page)

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