AIMS: To report on a family with five members who carry the A3243G mutation in mitochondrial tRNA for leucine 1 (MTTL1) and present with diabetes, chronic intestinal pseudo-obstruction (CIPO) and recurrent pancreatitis, and to screen for this mutation in a cohort of 36 unrelated patients with recurrent pancreatitis. METHODS: The mutation was quantified in several tissue samples from patients. Respiratory chain activity was studied in muscle biopsies and fibroblast cultures. In addition, the thymidine phosphorylase gene (TP) involved in mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) and three genes involved in chronic pancreatitis - PRSS1, SPINK1 and CFTR - were sequenced in affected patients. Finally, the MTTL1 gene was examined in 36 unrelated patients who had recurrent pancreatitis, but no mutations in the PRSS1 and SPINK1 genes. RESULTS: Heteroplasmy for the mtDNA A3243G mutation was found in all tissue samples from these patients, but no mutations were found in the genes coding for thymidine phosphorylase, PRSS1, SPINK1 and CFTR. Also, none of the 36 unrelated patients with recurrent pancreatitis were carrying any MTTL1 mutations. CONCLUSION: The mtDNA A3243G mutation associated with the gastrointestinal manifestations observed in the affected family should be regarded as a possible cause of CIPO and unexplained recurrent pancreatitis. However, the mutation is probably only weakly involved in cases of isolated recurrent pancreatitis.
AIMS: To report on a family with five members who carry the A3243G mutation in mitochondrial tRNA for leucine 1 (MTTL1) and present with diabetes, chronic intestinal pseudo-obstruction (CIPO) and recurrent pancreatitis, and to screen for this mutation in a cohort of 36 unrelated patients with recurrent pancreatitis. METHODS: The mutation was quantified in several tissue samples from patients. Respiratory chain activity was studied in muscle biopsies and fibroblast cultures. In addition, the thymidine phosphorylase gene (TP) involved in mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) and three genes involved in chronic pancreatitis - PRSS1, SPINK1 and CFTR - were sequenced in affected patients. Finally, the MTTL1 gene was examined in 36 unrelated patients who had recurrent pancreatitis, but no mutations in the PRSS1 and SPINK1 genes. RESULTS: Heteroplasmy for the mtDNA A3243G mutation was found in all tissue samples from these patients, but no mutations were found in the genes coding for thymidine phosphorylase, PRSS1, SPINK1 and CFTR. Also, none of the 36 unrelated patients with recurrent pancreatitis were carrying any MTTL1 mutations. CONCLUSION: The mtDNA A3243G mutation associated with the gastrointestinal manifestations observed in the affected family should be regarded as a possible cause of CIPO and unexplained recurrent pancreatitis. However, the mutation is probably only weakly involved in cases of isolated recurrent pancreatitis.
Authors: Sumit Parikh; Amy Goldstein; Amel Karaa; Mary Kay Koenig; Irina Anselm; Catherine Brunel-Guitton; John Christodoulou; Bruce H Cohen; David Dimmock; Gregory M Enns; Marni J Falk; Annette Feigenbaum; Richard E Frye; Jaya Ganesh; David Griesemer; Richard Haas; Rita Horvath; Mark Korson; Michael C Kruer; Michelangelo Mancuso; Shana McCormack; Marie Josee Raboisson; Tyler Reimschisel; Ramona Salvarinova; Russell P Saneto; Fernando Scaglia; John Shoffner; Peter W Stacpoole; Carolyn M Sue; Mark Tarnopolsky; Clara Van Karnebeek; Lynne A Wolfe; Zarazuela Zolkipli Cunningham; Shamima Rahman; Patrick F Chinnery Journal: Genet Med Date: 2017-07-27 Impact factor: 8.822
Authors: Paul de Laat; Saskia Koene; Lambert P W J van den Heuvel; Richard J T Rodenburg; Mirian C H Janssen; Jan A M Smeitink Journal: J Inherit Metab Dis Date: 2012-03-09 Impact factor: 4.982
Authors: Yi Shiau Ng; Catherine Feeney; Andrew M Schaefer; Carol Ellen Holmes; Paula Hynd; Charlotte L Alston; John P Grady; Mark Roberts; Mellisa Maguire; Alexandra Bright; Robert W Taylor; Yan Yiannakou; Robert McFarland; Doug M Turnbull; Gráinne S Gorman Journal: Ann Neurol Date: 2016-09-19 Impact factor: 10.422