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Identification of the First PAX4-MODY Family Reported in Brazil
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Identification of the First PAX4-MODY Family Reported in Brazil
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Identification of the First PAX4-MODY Family Reported in Brazil
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Journal Article
Identification of the First PAX4-MODY Family Reported in Brazil
2020
Overview
The aim of this study was to sequence the coding region of the
gene in a Brazilian cohort with clinical manifestations of monogenic diabetes.
This study included 31 patients with autosomal dominant history of diabetes, age at diagnosis ≤40 years, BMI <30 kg/m
, and no mutations in
or
, and
. Screening of the
coding region was performed by Sanger sequencing. In silico algorithms were used to assess the potential impact of amino acid substitutions on protein structure and function. Additionally, PAX4-MODY family members and 158 control subjects without diabetes were analyzed for the identified mutation.
The molecular analysis of
has detected one missense mutation, p.Arg164Gln (c.491G>A), segregating with diabetes in a large Brazilian family. The mutation was absent among the control group. The index case is a woman diagnosed at 32 years of age with polyneuropathy and treated with insulin. She did not present diabetic renal disease or retinopathy. Family members with the
p.Arg164Gln mutation have a heterogeneous clinical manifestation and treatment response, with age at diagnosis ranging from 24 years to 50 years.
To the best of our knowledge, this is the first study to report a PAX4-MODY family in Brazil. The age of PAX4-MODY diagnosis in the Brazilian family seems to be higher than the classical criteria for MODY. Our results reinforce the importance of screening large monogenic diabetes families for the understanding of the clinical manifestations of rare forms of diabetes for the specific and personalized treatment.
