Abstract:
:Hurler and Scheie syndromes, two of the six clinically distinct mucopolysaccharidoses, are deficient in the same lysosomal enzyme, alpha-L-iduronidase. A third group of iduronidase-deficient patients can now be identified during the pediatric years using clinical and radiographic criteria. Based on inferential evidence for allelism between the Hurler and Scheie genes, the occurrence of genetic compounds which simultaneously carry both mutant alleles may be predicted to occur. This can be considered analogous to the structural gene mutations leading to hemoglobin SC disease. Four patients with phenotypes intermediate between Hurler and Scheie syndromes are flet to represent genetic compounds of this type. Both clinical and roentgenographic features are helpful in distinguishing these patients from those with Hurler syndrome or Scheie syndrome. Fibroblast correction characteristics identical to those of Hurler syndrome and Scheie syndrome and absence of consanguinity are additional features which favor classification as genetic compounds. The possibility of a third mutant allele at the Hurler-Scheie locus or of extreme phenotype variation are not considered likely alternative explantations. Depending on the frequency of the Scheie syndrome and the Hurler syndrome, genetic compounds may occur with an intermediate frequency or may be more common than either homozygous condition.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Stevenson RE,Howell RR,McKusick VA,Suskind R,Hanson JW,Elliott DE,Neufeld EFsubject
Has Abstractpub_date
1976-01-01 00:00:00pages
111-22issue
1eissn
0031-4005issn
1098-4275journal_volume
57pub_type
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