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Phenotype-genotype correlation in CD36 deficiency types I and II
1Department of Laboratory Medicine, Hokkaido University School of Medicine, Sapporo, Japan.
Insights
CD36 deficiency, a condition affecting platelets and monocytes, was investigated in Japanese volunteers. Genetic analysis identified specific mutations as the primary causes for CD36 deficiency types I and II.
Area of Science:
- Hematology
- Genetics
- Molecular Biology
Background:
- CD36 deficiency is characterized by the absence of CD36 protein on platelets (Type II) or on both platelets and monocytes (Type I).
- Understanding the genetic basis of CD36 deficiency is crucial for diagnosing and managing related hematological conditions.
Purpose of the Study:
- To investigate the phenotype-genotype relationship in CD36 deficiency.
- To determine the prevalence of CD36 deficiency types I and II in a Japanese population.
- To identify the genetic mutations responsible for CD36 deficiency.
Main Methods:
- Diagnosis of CD36 deficiency based on CD36 protein expression on platelets and monocytes.
- Genotyping of apparently healthy Japanese volunteers (n=827) to assess deficiency prevalence.
- DNA sequencing to identify mutations in the CD36 gene and flanking regions.
Main Results:
- CD36 deficiency Type I and II were identified in 1.0% and 5.8% of volunteers, respectively.
- A T to C substitution (Pro90Ser) and an A insertion (nt 1159) were the major mutations causing Type I and II deficiencies.
- A dinucleotide deletion at nt539 played a minor role; novel polymorphisms were found in regulatory regions.
Conclusions:
- The study elucidates the primary genetic causes of CD36 deficiency (Types I and II) in the Japanese population.
- Findings challenge the hypothesis of a platelet-specific silent allele near the CD36 gene.
- Identified mutations provide valuable targets for genetic screening and understanding CD36-related disorders.
Abstract:
CD36 deficiency was studied with attention to the phenotype-genotype relationship. The diagnosis of CD36 deficiency was made when CD36 was negative on platelets (type II) or on both platelets and monocytes (type I). Among 827 apparently healthy Japanese volunteers, the type I and II deficiencies were found in 8 (1.0%) and 48 (5.8%), respectively. The T for C substitution at nt478 for Pro90Ser and the insertion of A at nt 1159 constituted the major causes of type I and II deficiencies. The dinucleotide deletion at nt539 had a minor role. In two family studies, we found a previously unreported polymorphic site in the 5'-proximal flanking region and the 3'-untranslated region. Including these new polymorphisms, DNA sequence other than the three known mutations affecting CD36 expression was not observed in the CD36 gene, calling into question the previous hypothesis that a platelet-specific silent allele exists near or at the CD36 gene.