Lysinuric protein intolerance presenting with multiple fractures
Lysinuric protein intolerance (LPI) is a rare autosomal recessive inborn error of metabolism caused by mutations in SLC7A7, which encodes a component of the dibasic amino acid transporter found in intestinal and renal tubular cells. Patients typically present with vomiting, diarrhea, irritability, f...
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doaj-8843537d916b4bad9f460ba4e551629d2020-11-24T21:10:29ZengElsevierMolecular Genetics and Metabolism Reports2214-42692014-01-011C17618310.1016/j.ymgmr.2014.03.004Lysinuric protein intolerance presenting with multiple fracturesJennifer E. Posey0Lindsay C. Burrage1Marcus J. Miller2Pengfei Liu3Matthew T. Hardison4Sarah H. Elsea5Qin Sun6Yaping Yang7Alecia S. Willis8Alan E. Schlesinger9Carlos A. Bacino10Brendan H. Lee11Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Pediatric Radiology, Texas Children's Hospital, 6701 Fannin, Suite 470, Houston, TX 77030, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USADepartment of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Suite R814, Houston, TX 77030-3411, USALysinuric protein intolerance (LPI) is a rare autosomal recessive inborn error of metabolism caused by mutations in SLC7A7, which encodes a component of the dibasic amino acid transporter found in intestinal and renal tubular cells. Patients typically present with vomiting, diarrhea, irritability, failure to thrive, and symptomatic hyperammonemia after protein-rich meals. Long-term complications may include pulmonary alveolar proteinosis, renal disease, and osteoporosis. We present a 5-year-old male who was followed in our skeletal dysplasia clinic for 3 years for multiple fractures, idiopathic osteoporosis, and short stature in the absence of typical features of LPI. Whole exome sequencing performed to determine the etiology of the osteoporosis and speech delay identified a nonsense mutation in SLC7A7. Chromosome microarray analysis identified a deletion involving the second allele of the same gene, and biochemical analysis supported the diagnosis of LPI. Our patient's atypical presentation underscores the importance of maintaining a high index of suspicion for LPI in patients with unexplained fractures and idiopathic osteoporosis, even in the absence of clinical symptoms of hyperammonemia after protein rich meals or other systemic features of classical LPI. This case further demonstrates the utility of whole exome sequencing in diagnosis of unusual presentations of rare disorders for which early intervention may modify the clinical course.http://www.sciencedirect.com/science/article/pii/S2214426914000275Lysinuric protein intoleranceOsteoporosisBone fracturesSLC7A7 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jennifer E. Posey Lindsay C. Burrage Marcus J. Miller Pengfei Liu Matthew T. Hardison Sarah H. Elsea Qin Sun Yaping Yang Alecia S. Willis Alan E. Schlesinger Carlos A. Bacino Brendan H. Lee |
spellingShingle |
Jennifer E. Posey Lindsay C. Burrage Marcus J. Miller Pengfei Liu Matthew T. Hardison Sarah H. Elsea Qin Sun Yaping Yang Alecia S. Willis Alan E. Schlesinger Carlos A. Bacino Brendan H. Lee Lysinuric protein intolerance presenting with multiple fractures Molecular Genetics and Metabolism Reports Lysinuric protein intolerance Osteoporosis Bone fractures SLC7A7 |
author_facet |
Jennifer E. Posey Lindsay C. Burrage Marcus J. Miller Pengfei Liu Matthew T. Hardison Sarah H. Elsea Qin Sun Yaping Yang Alecia S. Willis Alan E. Schlesinger Carlos A. Bacino Brendan H. Lee |
author_sort |
Jennifer E. Posey |
title |
Lysinuric protein intolerance presenting with multiple fractures |
title_short |
Lysinuric protein intolerance presenting with multiple fractures |
title_full |
Lysinuric protein intolerance presenting with multiple fractures |
title_fullStr |
Lysinuric protein intolerance presenting with multiple fractures |
title_full_unstemmed |
Lysinuric protein intolerance presenting with multiple fractures |
title_sort |
lysinuric protein intolerance presenting with multiple fractures |
publisher |
Elsevier |
series |
Molecular Genetics and Metabolism Reports |
issn |
2214-4269 |
publishDate |
2014-01-01 |
description |
Lysinuric protein intolerance (LPI) is a rare autosomal recessive inborn error of metabolism caused by mutations in SLC7A7, which encodes a component of the dibasic amino acid transporter found in intestinal and renal tubular cells. Patients typically present with vomiting, diarrhea, irritability, failure to thrive, and symptomatic hyperammonemia after protein-rich meals. Long-term complications may include pulmonary alveolar proteinosis, renal disease, and osteoporosis. We present a 5-year-old male who was followed in our skeletal dysplasia clinic for 3 years for multiple fractures, idiopathic osteoporosis, and short stature in the absence of typical features of LPI. Whole exome sequencing performed to determine the etiology of the osteoporosis and speech delay identified a nonsense mutation in SLC7A7. Chromosome microarray analysis identified a deletion involving the second allele of the same gene, and biochemical analysis supported the diagnosis of LPI. Our patient's atypical presentation underscores the importance of maintaining a high index of suspicion for LPI in patients with unexplained fractures and idiopathic osteoporosis, even in the absence of clinical symptoms of hyperammonemia after protein rich meals or other systemic features of classical LPI. This case further demonstrates the utility of whole exome sequencing in diagnosis of unusual presentations of rare disorders for which early intervention may modify the clinical course. |
topic |
Lysinuric protein intolerance Osteoporosis Bone fractures SLC7A7 |
url |
http://www.sciencedirect.com/science/article/pii/S2214426914000275 |
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