An Inherited Disorder of Lymphocyte Apoptosis: The Autoimmune Lymphoproliferative Syndrome

Figure 4. The gray boxes covering exons 2 through 5 correspond to the extracellular cysteine-rich receptor domains ( ). The
dark area of exon 9 is the cytoplasmic death-signaling domain. The localization and type of mutations in patients with the
autoimmune lymphoproliferative syndrome are depicted above the exon drawing. The top line of symbols identifies the location
of all published mutations from other research centers, including those in Italy ( ) and France ( ). The lower line of symbols
depicts the mutations identified in National Institutes of Health patients. All of the mutations to date are single-nucleotide
changes except for the 290-base pair ( ) homozygous deletion in exon 9 (Fr) found in a severely affected daughter of related
parents . The region of the gene most often mutated is the intracellular death domain.
The organization of theAPT1gene encoding Fas (CD95) (shown as numbered boxes separated by slashed lines indicating the intron
sequences).CRDsItFrbp(2)APT1
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Ann Intern Med
April 6, 1999
vol. 130
no. 7
591-601