Abstract:
:To elucidate genetic abnormalities in type I CD36 deficiency, we analyzed 28 Japanese subjects whose platelets and monocytes/macrophages lacked CD36 on their surface. We identified two novel mutations in the CD36 gene. One was a complex deletion/insertion mutation, in which 3 bp, GAG, were deleted at nucleotide (nt) 839-841, and 5 bp, AAAAC, were inserted at the same position (839-841del-->insAAAAC). Mutation 839-841del-->insAAAAC led to a frameshift and appearance of a premature stop codon; it was also accompanied with a marked reduction in the amount of CD36 mRNA. The other was a 12-bp deletion at nt 1438-1449 (1438-1449del) accompanied with or without skipping of exon 9 (nt 959-1028). Mutation 1438-1449del led to an inframe 4-amino-acid deletion, whereas exon 9 skipping led to a frameshift and the appearance of a premature stop codon. Expression assay revealed that both 1438-1449del and exon 9 skipping directly caused impairment of the surface expression of CD36. A survey of the five known mutations including 839-841del-->insAAAAC and 1438-1449del in type I CD36-deficient subjects demonstrated that the five mutations covered more than 90% of genetic defects among them and that the substitution of T for C at nt 478 (478C-->T) was the most common mutation with more than 50% frequency. However, none of the four subjects that possessed isoantibodies against CD36 had 478C-->T, suggesting that 478C-->T prevents the production of isoantibodies against CD36.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Kashiwagi H,Tomiyama Y,Nozaki S,Kiyoi T,Tadokoro S,Matsumoto K,Honda S,Kosugi S,Kurata Y,Matsuzawa Ydoi
10.1007/s004390100525keywords:
subject
Has Abstractpub_date
2001-06-01 00:00:00pages
459-66issue
6eissn
0340-6717issn
1432-1203journal_volume
108pub_type
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