1. Contiguous X-chromosome deletion syndrome encompassing the BTK, TIMM8A, TAF7L, and DRP2 genes.
- Author
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Sedivá A, Smith CI, Asplund AC, Hadac J, Janda A, Zeman J, Hansíková H, Dvoráková L, Mrázová L, Velbri S, Koehler C, Roesch K, Sullivan KE, Futatani T, and Ochs HD
- Subjects
- Adolescent, Adult, Agammaglobulinaemia Tyrosine Kinase, Child, Chromosome Mapping, Cohort Studies, Diagnosis, Differential, Genetic Diseases, X-Linked genetics, Humans, Infant, Male, Mitochondrial Precursor Protein Import Complex Proteins, RNA Polymerase II genetics, Agammaglobulinemia genetics, Chromosome Deletion, Chromosomes, Human, X genetics, Intercellular Signaling Peptides and Proteins genetics, Membrane Transport Proteins genetics, Nerve Tissue Proteins genetics, Protein-Tyrosine Kinases genetics, TATA-Binding Protein Associated Factors genetics, Transcription Factor TFIID genetics
- Abstract
X-linked agammaglobulinemia (XLA) is characterized by low levels of B-lymphocytes with early-onset, recurrent, microbial infections occasionally causing neurological symptoms. We observed an atypical clinical course of XLA, complicated since early childhood with neurological impairment, progressive sensorineural deafness, and dystonia in six boys of four unrelated families. The neurologic symptoms suggested the diagnosis of Mohr-Tranebjaerg syndrome, caused by mutations in the TIMM8A gene, previously known as DDP1, and located centromerically of BTK. Deafness dystonia peptide (DDP1) participates in neurological development and is a part of the mitochondrial protein import pathway. Mutation analysis of the BTK gene revealed gross deletions of different lengths in all patients, in one case extending approximately 196 kb, including the genes TIMM8A, TAF7L, and DRP2. The most prominent clinical findings of this contiguous deletion syndrome are the combination of immunodeficiency and sensorineural deafness, which were present in all affected boys. The severity of symptoms, however, did not correlate with the extent of the deletion.
- Published
- 2007
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