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Hereditary tyrosinaemia type II in a consanguineous Ashkenazi Jewish family: Intrafamilial variation in phenotype; absence of parental phenotype effects on the fetus
Author(s) -
Chitayat D.,
Balbul A.,
Hani V.,
Mamer O. A.,
Clow C.,
Scriver C. R.
Publication year - 1992
Publication title -
journal of inherited metabolic disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.462
H-Index - 102
eISSN - 1573-2665
pISSN - 0141-8955
DOI - 10.1007/bf01799631
Subject(s) - tyrosinemia , offspring , fetus , phenotype , sibling , medicine , consanguinity , compound heterozygosity , family history , pregnancy , genetics , endocrinology , pediatrics , biology , tyrosine , gene , psychology , developmental psychology , biochemistry
Summary We describe an Ashkenazi Jewish family in which two adults, offspring of consanguineous parents, have persistent hypertyrosinaemia (770–1110 µmol/L; normal < 110 µmol/L). The metabolic disorder in this family is apparently due to hepatic cytosolic tyrosine aminotransferase deficiency (hereditary tyrosinaemia, type II; McKusick, 276600), because it is associated with the oculocutaneous manifestations of Richner‐Hanhart syndrome. The association of this syndrome with hereditary tyrosinaemia type II is presumed to be constant. It is not in this family. The affected female sib (age 41 years) has hypertyrosinaemia and oculocutaneous signs; the brother (age 39 years) has hypertyrosinaemia but no oculocutaneous disease. Both sibs have two children; none has signs of a metabolic fetopathy. Maternal hypertyrosinaemia and maternal hyperphenylalaninaemia evidently constitute different risk factors for the fetus. Paternal hypertyrosinaemia is apparently not a risk to male infertility.