Carrier detection and prenatal diagnosis of cystic fibrosis using an intragenic TA-repeat polymorphism.
We have analysed the segregation of a TA-repeat polymorphism in intron 17b of the cystic fibrosis transmembrane conductance regulator gene responsible for cystic fibrosis (CF) in 23 French CF families non-informative for the delta F508 mutation (i.e. with at least one parent not carrying delta F508) or closely linked DNA markers. At least 13 different alleles ranging from 7 to 45 repeats were observed and the detected heterozygosity was 89%. Of the 23 families studied, 19 were fully informative for prenatal diagnosis or carrier detection, 3 were partially informative and one was not informative. In 6 families, prenatal diagnosis for CF or carrier detection in siblings of CF cases were performed using this polymorphism.
Mornet
E
E
Centre d'Etudes de Biologie Prénatale (CEBIOP), Paris, France.
Chateau
C
C
Simon-Bouy
B
B
Boue
J
J
Zielenski
J
J
Tsui
L C
LC
Boue
A
A
D001483:Base Sequence; D003550:Cystic Fibrosis / Q000235:genetics*; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D006580:Genetic Carrier Screening; D006801:Humans; D007438:Introns; D008297:Male; D008565:Membrane Proteins / Q000235:genetics; D010375:Pedigree; D016133:Polymerase Chain Reaction / Q000379:methods; D011110:Polymorphism, Genetic; D012091:Repetitive Sequences, Nucleic Acid
C505032:CFTR protein, human; D008565:Membrane Proteins; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D004247:DNA