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<p><i>KAT6B</i> mutations are responsible for Say-Barber-Biesecker-Young-Simpson syndrome or Genitopatellar syndrome, with most mutations occurring in its exon 18. A pregnancy with normal early antenatal examination revealed the presence of hypospadias in the fetus but with no abnormal amniotic fluid volume in ultrasonography at 29th<sup>+ 4d</sup> weeks’ gestation. After amniocentesis, the trios’ whole exome sequencing was performed and a novel frameshift mutation (<i>KAT6B</i>: exon10: c.2153_2159del, p. R718Lfs*3) was identified for her fetus, then verified by the parents as a <i>de novo</i> mutation. Following this couple’s decision to induce labor, the appearance of the fetus had hypospadias but with a normal face and was able to be palpated for the patella. <i>KAT6B</i> mutations often occur with a variety of symptoms. To our acknowledgment, this is the first report of a novel <i>de novo KAT6B</i> mutation causing only hypospadias for the fetus, which further expands the spectrum of <i>KAT6B</i> variants and the genotype-phenotype relationship for this disease.</p>

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A Novel De Novo KAT6B Mutation Causes Hypospadias in a Chinese Fetus at 29 Weeks Gestation

  • 期刊论文

  • 发表日期：

    2025年4月22日

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  • Xue Zhong,
  • Meixin Liu,
  • Qun Gao,
  • Monong Li,
  • Shiguo Liu

摘要

KAT6B mutations are responsible for Say-Barber-Biesecker-Young-Simpson syndrome or Genitopatellar syndrome, with most mutations occurring in its exon 18. A pregnancy with normal early antenatal examination revealed the presence of hypospadias in the fetus but with no abnormal amniotic fluid volume in ultrasonography at 29th+ 4d weeks’ gestation. After amniocentesis, the trios’ whole exome sequencing was performed and a novel frameshift mutation (KAT6B: exon10: c.2153_2159del, p. R718Lfs*3) was identified for her fetus, then verified by the parents as a de novo mutation. Following this couple’s decision to induce labor, the appearance of the fetus had hypospadias but with a normal face and was able to be palpated for the patella. KAT6B mutations often occur with a variety of symptoms. To our acknowledgment, this is the first report of a novel de novo KAT6B mutation causing only hypospadias for the fetus, which further expands the spectrum of KAT6B variants and the genotype-phenotype relationship for this disease.