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open-access-imgOpen AccessPure Distal 7q Duplication: Describing a Macrocephalic Neurodevelopmental Syndrome, Case Report and Review of the Literature
Author(s)
Kerri Bosfield,
Jullianne Diaz,
Eyby Leon
Publication year2021
Publication title
molecular syndromology
Resource typeJournals
PublisherKarger Publishers
Pure distal duplications of 7q have rarely been described in the medical literature. The term pure refers to duplications that occur without an accompanying clinically significant deletion. Pure 7q duplications of various segments have previously been reported in the literature; however, pure distal 7q duplications have only been reported in 21 cases. Twenty of these earlier reports described patients who were identified via karyotype and 1 recently by microarray. Cases have also been reported in genomic databases such as DECIPHER and the University of California Santa Cruz genome browser. We have reviewed 7 additional cases with distal 7q duplications from these databases and compared them to 7 previously reported distal 7q duplication cases to uncover common features including global developmental delay, frontal bossing, macrocephaly, seizures, kyphoscoliosis/skeletal anomalies, and microretrognathia/palatal anomalies. In this case, we describe a 4-year-old boy with a 30.8-Mb pure duplication of 7q32.1q36.3. Newly reported features associated with this duplication include intermittent dystonic posturing, increased behavioral irritability, eosinophilic esophagitis, segmental vertebral anomalies, and segmental intermittent limb cyanosis. We highlight the importance of using publicly available databases to describe rare genetic syndromes and to better characterize the features of pure distal 7q duplications and further postulate that duplication of this region represents a recognizable macrocephalic neurodevelopmental syndrome.
Subject(s)anatomy , biology , frontal bossing , gene , gene duplication , genetics , irritability , macrocephaly , medicine , menopause , omim : online mendelian inheritance in man , pediatrics , phenotype
Language(s)English
SCImago Journal Rank0.609
H-Index36
eISSN1661-8777
pISSN1661-8769
DOI10.1159/000513453

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