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In this 25-year retrospective study, we analyzed data from 200 medical records concerning diagnosis, consanguinity, and geographic origin from probands with autosomal recessive inborn errors of metabolism in a reference service based in Campinas, Brazil. Consanguinity was confirmed by 56 (28%) couples, with similar values among groups of intermediary metabolism (25.3%), energy metabolism (30.3%), and complex molecules (29%). The most frequent union was first cousins (47.2%). Consanguinity was considered possible in other 16 (8%) couples. Concerning the diagnosis of multiple cases, the most frequent conditions were hyperphenylalaninemias, mucopolysaccharidosis type I, GM1 gangliosidosis, and glycogen storage disease type I. No disease cluster could be related temporally and in proximity in this work. A higher consanguinity rate was found between parents born in Bahia (33.3%), followed by Pernambuco (27.2%), Minas Gerais (19.7%), and Paraná (14.8%)

Consanguinity and Geographic Origin of Patients With Autosomal Recessive Metabolic Disorders Evaluated in a Reference Service in Campinas, Brazil