Browsing by Author "Celestino-Soper, Patricia B. S."

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    Intragenic CFTR Duplication and 5T/12TG Variant in a Patient with Non-Classic Cystic Fibrosis
    (SpringerNature, 2016-12-20) Celestino-Soper, Patricia B. S.; Simpson, Edward; Brink, Danika Tumbleson; Lynnes, Ty C.; Dlouhy, Stephen; Vatta, Matteo; Yeley, Jana; Brown, Cynthia; Bai, Shaochun; Department of Medical and Molecular Genetics, IU School of Medicine
    Cystic fibrosis (CF) is an autosomal recessive disorder characterized by the accumulation of sticky and heavy mucus that can damage several organs. CF shows variable expressivity in affected individuals, but it typically causes respiratory and digestive complications as well as congenital bilateral absence of the vas deferens in males. Individuals with classic CF usually have variants that produce a defective protein from both alleles of the CFTR gene. Individuals with other variants may present with classic, non-classic, or milder forms of CF due to lower levels of functional CFTR protein. This article reports the genetic analysis of a female with features of asthma and mild or non-classic CF. CFTR sequencing demonstrated that she is a carrier for a maternally derived 5T/12TG variant. Deletion/duplication analysis by multiplex ligation-dependent probe amplification (MLPA) showed the presence of an intragenic paternally derived duplication involving exons 7-11 of the CFTR gene. This duplication is predicted to result in the production of a truncated CFTR protein lacking the terminal part of the nucleotide-binding domain 1 (NBD1) and thus is likely to be a non-functioning allele. The combination of this large intragenic duplication and 5T/12TG is the probable cause of the mild or non-classic CF features in this individual.
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    MIB2 variants altering NOTCH signalling result in left ventricle hypertrabeculation/non-compaction and are associated with Ménétrier-like gastropathy
    (Oxford, 2017) Piccolo, Pasquale; Attanasio, Sergio; Secco, Ilaria; Sangermano, Riccardo; Strisciuglio, Caterina; Limongelli, Giuseppe; Miele, Erasmo; Mutarelli, Margherita; Banfi, Sandro; Nigro, Vincenzo; Pons, Tirso; Valencia, Alfonso; Zentilin, Lorena; Campione, Severo; Nardone, Gerardo; Lynnes, Ty C.; Celestino-Soper, Patricia B. S.; Spoonamore, Katherine G.; D'Armiento, Franco; Giacca, Mauro; Staiano, Annamaria; Vatta, Matteo; Collesi, Chiari; Brunetti-Pierri, Nicola; Medicine, School of Medicine
    We performed whole exome sequencing in individuals from a family with autosomal dominant gastropathy resembling Ménétrier disease, a premalignant gastric disorder with epithelial hyperplasia and enhanced EGFR signalling. Ménétrier disease is believed to be an acquired disorder, but its aetiology is unknown. In affected members, we found a missense p.V742G variant in MIB2, a gene regulating NOTCH signalling that has not been previously linked to human diseases. The variant segregated with the disease in the pedigree, affected a highly conserved amino acid residue, and was predicted to be deleterious although it was found with a low frequency in control individuals. The purified protein carrying the p.V742G variant showed reduced ubiquitination activity in vitro and white blood cells from affected individuals exhibited significant reductions of HES1 and NOTCH3 expression reflecting alteration of NOTCH signalling. Because mutations of MIB1, the homolog of MIB2, have been found in patients with left ventricle non-compaction (LVNC), we investigated members of our family with Ménétrier-like disease for this cardiac abnormality. Asymptomatic left ventricular hypertrabeculation, the mildest end of the LVNC spectrum, was detected in two members carrying the MIB2 variant. Finally, we identified an additional MIB2 variant (p.V984L) affecting protein stability in an unrelated isolated case with LVNC. Expression of both MIB2 variants affected NOTCH signalling, proliferation and apoptosis in primary rat cardiomyocytes. In conclusion, we report the first example of left ventricular hypertrabeculation/LVNC with germline MIB2 variants resulting in altered NOTCH signalling that might be associated with a gastropathy clinically overlapping with Ménétrier disease.
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    A post mortem assessment of a 25-year-old man with ascending aortic dissection and a novel MYLK variant
    (PAGEpress, 2015) Hodge, Katelyn; Spoonamore, Katherine G.; Griffith, Christopher B.; Weaver, David D.; Celestino-Soper, Patricia B. S.; Lynnes, Ty C.; Gao, Hongyu; Liu, Yunlong; Vatta, Matteo; Medical and Molecular Genetics, School of Medicine
    We report on the process of post mortem evaluation and genetic testing following the death of a 25-year-old man due to ascending aortic dissection leading to aortic rupture. Following the negative clinical testing of a 12- gene thoracic aortic aneurysm and dissection panel, research testing revealed a novel c.5732A>T (p.E1911V) variant in exon 34 of the MYLK gene (NM_053025). Two likely pathogenic variants in this gene have been reported previously in individuals with familial thoracic aortic aneurysm and dissection. Given the unclear clinical consequence of the variant found in our proband, we have classified this change as a variant of uncertain significance. In addition to discussing the complexity involved in variant interpretation, we recognize the need for additional research for more accurate MYLK interpretation. Finally, we comment on the unique challenges of post mortem genetic testing.