Linkage studies in Italian families with familial adenomatous polyposis.
Hum Genet
; 90(5): 545-50, 1993 Jan.
Article
in En
| MEDLINE
| ID: mdl-8094067
ABSTRACT
Linkage analysis was performed on 188 subjects belonging to 18 Italian families segregating for familial adenomatous polyposis (FAP) using 7 polymorphic markers (5 restriction fragment length and 2 dinucleotide repeat polymorphisms) mapping in 5q21. A two-point linkage analysis performed with the LINKAGE program gave significant lod scores (> 3) between the Pi227, C11p11, YN5.64, YN5.48 probes and the disease, whereas the ECB27, CB83 and EF5.44 markers showed lower lod scores. Some 11 recombination events were identified from the analysis of 101 meioses. The best map that we could determine confirmed that reported in previous studies. The location of the new marker, CB83, lying between YN5.64 and YN5.48, remains imprecise. No genetic heterogeneity was detected, with all the families showing linkage for at least one of the probes. One 34-year-old individual having an affected haplotype was however classified as healthy after clinical examinations. The results confirm the applicability of the linkage approach for presymptomatic diagnosis of FAP.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Adenomatous Polyposis Coli
/
Genetic Linkage
Type of study:
Diagnostic_studies
/
Prognostic_studies
Limits:
Adult
/
Female
/
Humans
/
Male
Country/Region as subject:
Europa
Language:
En
Journal:
Hum Genet
Year:
1993
Document type:
Article
Affiliation country:
Italy