title: [Anencephalus immunogenetic factor].
abstract: The T/t complex in the mouse is considered to be a gene locus that brings about neural tube defects. This locus is found to exist near the H-2 complex, which is the MHC of the mouse. Accordingly, it is conceivable that there exists a T/t-like complex near the HLA complex in humans. Studies on the HLA-A, -B, -DR, -DRw52, -53 and DQ loci of parents with anencephalus and affected offspring were undertaken with the aim of revealing the relationship between anencephalus and the HLA complex. The following results were obtained: The gene frequency of HLA-DR5 in a mother with anencephalus was significantly higher than in controls. HLA-DR materno-paternal compatibility was significantly higher than in control couples. An increase in HLA-DR, -DRw52, -53 and DQ homozygosity were observed among the affected offspring. These results indicated that there may exist an anencephalus immunogenetic factor in the HLA-D region.
authors.forename: S
authors.initials: S
authors.lastname: Fujisawa
authors.forename: K
authors.initials: K
authors.lastname: Aoki
authors.forename: Y
authors.initials: Y
authors.lastname: Yagami
mesh_terms: D000328:Adult; D000757:Anencephaly / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D007231:Infant, Newborn; D008285:Major Histocompatibility Complex; D008297:Male
chemical_list: D000949:Histocompatibility Antigens Class II