Ophthalmologic abnormalities in a de novo terminal 6q deletion. 2010

Khaled K Abu-Amero, and Ali Hellani, and Mustafa A Salih, and Abdulkarim Al Hussain, and Majed al Obailan, and Ghassan Zidan, and Ibrahim A Alorainy, and Thomas M Bosley
Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia. abuamero@gmail.com

OBJECTIVE To correlate the clinical phenotype with the genotype of a boy with a terminal deletion of chromosome 6q and to compare these observations to previous reports of 6q deletions and review of the literature. METHODS Careful clinical evaluation, conventional cytogenetic analysis on GTG-banded chromosomes and 244K array CGH analysis. RESULTS This 14 year old Saudi boy had modest mental retardation, seizures, microcephaly, cortical dysplasia, a non-comitant esotropia, impersistent eccentric gaze, congenital nystagmus, thick corneas, and substantial myopia. He had a de novo 10.79 Mb deletion on chromosome 6 from 6q25.3 to 6qter. The deleted region extended from nucleotide 159929512 to 170723629 and encompassed 87 genes. Eleven genes remained within the proband's deleted region after excluding genes located in deleted areas reported in phenotypically normal individuals. Among those 11 genes, only the TBP (TATA box binding protein) gene has been associated with any symptom or sign observed in our patient. CONCLUSIONS This boy had clinical features similar to patients reported with the 6q terminal deletion syndrome. In addition, he had an unusual ocular motility pattern and thick corneas, features that may be more common than previously recognized. Deleted genes in this area of chromosome 6 may contribute to ophthalmic abnormalities in addition to mental retardation.

UI MeSH Term Description Entries
D008279 Magnetic Resonance Imaging Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques. Chemical Shift Imaging,MR Tomography,MRI Scans,MRI, Functional,Magnetic Resonance Image,Magnetic Resonance Imaging, Functional,Magnetization Transfer Contrast Imaging,NMR Imaging,NMR Tomography,Tomography, NMR,Tomography, Proton Spin,fMRI,Functional Magnetic Resonance Imaging,Imaging, Chemical Shift,Proton Spin Tomography,Spin Echo Imaging,Steady-State Free Precession MRI,Tomography, MR,Zeugmatography,Chemical Shift Imagings,Echo Imaging, Spin,Echo Imagings, Spin,Functional MRI,Functional MRIs,Image, Magnetic Resonance,Imaging, Magnetic Resonance,Imaging, NMR,Imaging, Spin Echo,Imagings, Chemical Shift,Imagings, Spin Echo,MRI Scan,MRIs, Functional,Magnetic Resonance Images,Resonance Image, Magnetic,Scan, MRI,Scans, MRI,Shift Imaging, Chemical,Shift Imagings, Chemical,Spin Echo Imagings,Steady State Free Precession MRI
D008297 Male Males
D008607 Intellectual Disability Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28) Disability, Intellectual,Idiocy,Mental Retardation,Retardation, Mental,Deficiency, Mental,Intellectual Development Disorder,Mental Deficiency,Mental Retardation, Psychosocial,Deficiencies, Mental,Development Disorder, Intellectual,Development Disorders, Intellectual,Disabilities, Intellectual,Disorder, Intellectual Development,Disorders, Intellectual Development,Intellectual Development Disorders,Intellectual Disabilities,Mental Deficiencies,Mental Retardations, Psychosocial,Psychosocial Mental Retardation,Psychosocial Mental Retardations,Retardation, Psychosocial Mental,Retardations, Psychosocial Mental
D008831 Microcephaly A congenital abnormality in which the CEREBRUM is underdeveloped, the fontanels close prematurely, and, as a result, the head is small. (Desk Reference for Neuroscience, 2nd ed.) Microlissencephaly,Severe Congenital Microcephaly,Congenital Microcephalies, Severe,Congenital Microcephaly, Severe,Microcephalies,Microcephalies, Severe Congenital,Microcephaly, Severe Congenital,Microlissencephalies,Severe Congenital Microcephalies
D009216 Myopia A refractive error in which rays of light entering the EYE parallel to the optic axis are brought to a focus in front of the RETINA when accommodation (ACCOMMODATION, OCULAR) is relaxed. This results from an overly curved CORNEA or from the eyeball being too long from front to back. It is also called nearsightedness. Nearsightedness,Myopias,Nearsightednesses
D010375 Pedigree The record of descent or ancestry, particularly of a particular condition or trait, indicating individual family members, their relationships, and their status with respect to the trait or condition. Family Tree,Genealogical Tree,Genealogic Tree,Genetic Identity,Identity, Genetic,Family Trees,Genealogic Trees,Genealogical Trees,Genetic Identities,Identities, Genetic,Tree, Family,Tree, Genealogic,Tree, Genealogical,Trees, Family,Trees, Genealogic,Trees, Genealogical
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D002872 Chromosome Deletion Actual loss of portion of a chromosome. Monosomy, Partial,Partial Monosomy,Deletion, Chromosome,Deletions, Chromosome,Monosomies, Partial,Partial Monosomies
D002896 Chromosomes, Human, Pair 6 A specific pair GROUP C CHROMSOMES of the human chromosome classification. Chromosome 6
D003241 Consanguinity The magnitude of INBREEDING in humans. Inbreeding, Human,Consanguineous Marriage,Consanguinous Mating,Consanguineous Marriages,Consanguinities,Consanguinous Matings,Human Inbreeding,Human Inbreedings,Inbreedings, Human,Marriage, Consanguineous,Marriages, Consanguineous,Mating, Consanguinous,Matings, Consanguinous

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