Allele frequency of two intragenic microsatellite loci of SEL1L gene in Northern Italian population.
Two cytosine-adenine (CA) repeats CAR/CAL and RepIN20 occur in the human SEL1L gene, which is regarded as a candidate gene for insulin-dependent diabetes mellitus (IDDM) and Grave's disease. We have characterized these repeats to determine if they might serve as effective microsatellite markers for linkage analysis to clarify whether SEL1L gene plays a role in the pathogenesis of these autoimmune diseases. The allele frequencies and average heterozygosity of the microsatellite repeats were analysed in 94 DNA samples from peripheral blood mononuclear (PBMC) cells from adults of Northern Italy. The average heterozygosity was 0.68 for CAR/CAL polymorphism and 0.85 for RepIN20. The size of PCR fragments of CAR/CAL ranged from 207-225 bp and the most frequent allele was 207 bp (40.4%). The size of the fragments of RepIN20 ranged from 237-255 bp and the most frequent allele was 249 bp (30.8%). In the light of the highly polymorphic nature of both microsatellites and their intragenic location in SEL1L gene, we suggest that they could provide a means for linkage analysis to clarify the potential role of SEL1L in conferring susceptibility to IDDM or Grave's disease.
Chiaramonte
Raffaella
R
Department of Biomedical Sciences and Technologies, University of Milano, Segrate, Italy. Raffaella.Chiaramonte@unimi.it
Sabbadini
Marta
M
Balordi
Francesca
F
Comi
Paola
P
Sherbet
Gajanan V
GV
D005787:Gene Frequency / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D007558:Italy; D018895:Microsatellite Repeats / Q000235:genetics*; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics; D011506:Proteins / Q000235:genetics*
D011506:Proteins; C117384:SEL1L protein, human