Pre-implantation genetic diagnosis in an Iranian family with a novel mutation in MUT gene

Parham Habibzadeh, Zahra Tabatabaei, Mohammad Ali Farazi Fard, Laila Jamali, Aazam Hafizi, Pooneh Nikuei, Leila Salarian, Mohammad Hossein Nasr Esfahani, Zahra Anvar, Mohammad Ali Faghihi

Research output: Contribution to journalArticlepeer-review


Background: Methylmalonic acidemia (MMA), which is an autosomal recessive metabolic disorder, is caused by mutations in methylmalonyl-CoA mutase (MUT) gene. As a result, the conversion of methylmalonyl-CoA to succinyl-CoA is impaired in this disorder, leading to a wide range of clinical manifestations varying from no signs or symptoms to severe lethargy and metabolic crisis in newborn infants. Since identification of novel mutations in MUT gene can help discover the exact pathogenesis of MMA and also use these disease-causing mutations in prenatal diagnosis, this study was conducted to uncover the possible mutations in an Iranian couple with a deceased offspring clinically diagnosed as having organic acidemia. Moreover, to prevent the occurrence of the mutation in the next pregnancy, we took the advantage of pre-implantation genetic diagnosis (PGD), which resulted in a successful pregnancy. Case presentation: The affected individual was a 15-month-old boy who passed away due to aspiration pneumonia. The child presented at the age of 3 months with lethargy, protracted vomiting, hypotonia, and decreased level of consciousness. To find the mutated gene, Next Generation Sequencing (NGS) was performed as carrier testing for the parents and the results revealed a novel (private) heterozygous missense mutation in MUT gene (c.1055A > G, p.Q352R). After performing PGD on three blastomeres, one was identified as being homozygous wild-type that was followed by successful pregnancy. Conclusions: Our study identified a novel, deleterious, heterozygous missense mutation in MUT gene in a couple and helps to consider the genetic counselling and prenatal diagnosis more seriously for this family with clinical phenotypes of organic acidemia.

Original languageEnglish (US)
Article number22
JournalBMC medical genetics
Issue number1
StatePublished - Feb 3 2020
Externally publishedYes


  • Metabolic diseases
  • Methylmalonic acidemia
  • Mutation, missense
  • Organic acidemia
  • Preimplantation diagnosis

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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