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20Q13.2-Q13.33 Deletion Syndrome: a Case Report

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20Q13.2-Q13.33 Deletion Syndrome: a Case Report Journal of Pediatric Genetics 2 (2013) 157–161 157 DOI 10.3233/PGE-13065 IOS Press Case Report 20q13.2-q13.33 deletion syndrome: A case report Merlin G. Butlera,*, Kelly M. Usreya, Jennifer L. Robertsa, Ann M. Manzardoa and Stephen R. Schroederb aDepartments of Psychiatry & Behavioral Sciences and Pediatrics, University of Kansas Medical Center, Kansas City, KS, USA bKansas University Center on Developmental Disabilities, Schiefelbusch Institute for Life Span Studies, University of Kansas, Lawrence, KS, USA Received 15 August 2013 Revised 6 September 2013 Accepted 4 October 2013 Abstract. We report a 32-month-old female of Peruvian ethnicity identified with a rare 20q13.2-q13.33 deletion using microarray analysis. She presented with intellectual disability, absent speech, hypotonia, pre- and post-natal growth retardation and an abnor- mal face with a unilateral cleft lip. Clinical features and genetic findings with the loss of 30 genes, including GNAS, MC3R, CDH4 and TFAP2C, are described in relationship to the very few cases of 20q13 deletion reported in the literature. Deletion of this region may play an important role in neurodevelopment and function and in causing specific craniofacial features. Keywords: Microarray analysis, 20q13 deletion, intellectual disability, atypical development, dysmorphic features, cleft lip 1. Introduction (high forehead, broad nasal bridge, thin upper lip, small chin, hypertelorism and malformed ears) [6–10]. Deletions of the long arm of chromosome 20 are rare Herein, we report another individual with the rare with the ring chromosome 20 being the most com- 20q13.2-q13.33 interstitial deletion (7.3 Mb in size) monly reported anomaly with over 100 cases in the and the first detected using chromosomal microarray literature. Ring chromosome 20 is associated with sei- analysis. This patient was ascertained in a study to zures, developmental delay and microcephaly but no enroll infants and children with atypical development characteristic growth or dysmorphic anomalies [1–5]. and autism from an underdeveloped country, Peru [11]. Small deletions of the distal long arm of chromosome 20 have been reported in six cases without ring chro- mosome or unbalanced translocation involvement and 2. Case report with intellectual disability, decreased speech, hypoto- nia, growth retardation and abnormal facial features The proband is a female with a unilateral cleft lip, dysmorphic features, psychomotor developmental delay, *Corresponding author: Merlin G. Butler, Departments of Psychiatry hypotonia, speech delay, self-injury and failure to thrive. & Behavioral Sciences and Pediatrics, KS University Medical The pregnancy and delivery history included prematurity Center, 3901 Rainbow Blvd, MS 4015, Kansas City, KS 66160, USA. Tel.: +1 913 588 1873; Fax: +1 913 588 1305; E-mail: with delivery at 7 mo gestation by C-section secondary [email protected]. to oligohydramnios. Birth weight was 1.47 kg (<3%). 2146-4596/13/$27.50 © 2013 – IOS Press and the authors. All rights reserved 158 M.G. Butler et al. / 20q13.2-q13.33 deletion syndrome There were no other pregnancy or family history issues. At 32 mo of age, her height was 72 cm (< 3%), She was the first baby born to the mother at age 37 yr weight was 8.1 kg (< 3%) and head circumference and father at age 39 yr. She remained in an incubator was 44 cm (< 3%) (Fig. 1). She was noted to have for one month after delivery. Due to multiple congenital growth retardation, a flaccid hypotonic, triangular face anomalies, a chromosome study (at 400 band level) with an open mouth and small pointed chin, protrud- was obtained and a normal female karyotype was found. ing poorly formed, low-set ears, a flattened nasal She had a history of bronchitis, ear infections and diar- bridge with hypertelorism, broad appearing eyebrows rhea during infancy. Hearing evaluation at 9 mo showed with synophrys, hirsutism, mild ptosis, anteverted decreased hearing which improved after placement of nares with a flattened nasal tip, strabismus and a scar ear tubes. Surgical correction of the left sided cleft lip on left side of upper lip (secondary to surgical repair was also successful. of cleft lip). She preferred to be alone, played little At 11 mo of age, she was small (weight at 4.9 kg, with family members and did not imitate others. The < 3%; length at 59 cm, < 3%) and had sparse hair, patient slept 8 h per night, did not speak and only large appearing simple ears, a triangular face with signed when hungry. No seizure activity was reported an asymmetric appearing nose secondary to cleft lip by the family. Visual function was considered normal repair, mild right hemi-hypertrophy and chronic mal- but mild myopia and astigmatism were noted. Dental nutrition. No other major illnesses, operations or caries were present. A bone age X-ray study showed hospitalizations were noted. Ultrasound studies of the delay and head magnetic resonance imaging showed abdomen and kidneys were normal. Microcytic anemia no vascular malformations or other abnormalities. She was reported by history. No endocrine, skeletal, labo- received physical, language and sensory integration ratory or clinical findings of Albright hereditary osteo- therapies. dystrophy (AHO) were observed as noted in other As part of a research study to identify infants and individuals reported with mutations or disturbances of children with atypical development in Peru, and after the GNAS gene located in the 20q13 band [12–15]. signed consent of approved forms by the Human Sub- Prior to the microarray testing, Russell-Silver syn- jects Committee, buccal cells were collected using drome was considered as a possible diagnosis in the cotton swabs for deoxyribonucleic acid (DNA) isolation patient in view of her small size, mild hemi-hypertrophy, as described by Rethmeyer et al. [16] for chromosomal triangular face and small chin, all features commonly microarray analysis. The Affymetrix Genome-Wide seen in this syndrome [12]. Human SNP Array 6.0 version was used which consists Fig. 1. Frontal and profile views of our patient at 71 mo of age with the 20q13.2-q13.33 deletion identified by microarray analysis. M.G. Butler et al. / 20q13.2-q13.33 deletion syndrome 159 Fig. 2. Chromosomal microarray analysis using the Affymetrix Genome-Wide Human SNP Array 6.0 showing the location of the deletion on chromosome 20 involving bands q13.2 and q13.3 (53,512,484-60,850,110 bp from p terminus). Y axis shows the chromosome copy number (2 = normal or nondeletion; 1 = deletion from a single chromosome; 0 = deletion from both chromosomes). Genes in the deleted region are shown. of 1.8 million DNA probes to determine deletions or of a ring chromosome, unbalanced chromosome trans- duplications in the genome. A 7.3 Mb size deletion locations or subtelomeric 20q13.33 deletions detect- was found involving the 20q13.2-q13.33 region able by fluorescence in situ hybridization analysis. [53,512,484-60,850,110 bp based on the University of Our subject did not present with AHO which is char- California, Santa Clara (UCSC) hg 19 human genome, acterized by short stature, moderate obesity, a particular National Center for Biotechnology Information (NCBI) facial appearance, shortening of the fourth and fifth build 37, February 2009)] (Fig. 2). The Affymetrix digits and metatarsals, hormone resistance and variable Chromosome Analysis Suite 1.2.2 software version learning problems [9,12]. AHO is reported in some was used for determination of the location and size of individuals with a 20q13 deletion including the GNAS the chromosome anomaly and number of involved gene. The GNAS gene is a complex, tissue-specific DNA markers. imprinting locus producing a G subunit-regulatory pro- tein which functions as a guanine nucleotide-binding signal protein by stimulating the secondary messenger, 3. Discussion cyclic adenosine monophosphate [15,23]. The GNAS gene produces multiple transcripts through alternative Chromosomal microarray analysis is now commonly promoters and alternative splicing [24–27]. Why distur- used in the clinical setting in developed countries for bances of GNAS function cause only some individuals evaluation of birth defects and intellectual disabilities to have AHO with the same or similar chromosome in order to identify deletions or duplications in the deletion is unknown. genome. There are over 400 described syndromes in Herein, we present our subject without features of which cleft lip and/or palate are noted [17–20]. One of AHO but with severe growth retardation, cognitive the more common deletion syndromes associated with impairment, hypotonia, and dysmorphic features. Our a dysmorphic face including a cleft lip and/or palate, subject had similar features seen in previous cases with developmental delay and neuropsychiatric problems is a distal 20q deletion but had a larger deletion (7.3 Mb 22q11.2 deletion also referred to as DiGeorge, veloc- in size consisting of 30 genes and 6 sno/miRNAs) ardiofacial or Shprintzen syndrome [21,22]. Other dele- compared with the approximate 6.0 Mb deletion seen tion syndromes identified using chromosome analysis in in two previously reported cases by Geneviève et al. [6] which cleft lip and/or palate occurs include: partial determined by microsatellite DNA marker analysis. monosomy of 1q, 4p, 4q, 5p, 6p, 7q, 9q, 11q, 12p, Parental studies were not available for our subject. 12q, 18p, 18q and 21q [2,12]. The previous six distal 20q13 deletion cases were To date, seven subjects (including our subject) have found to have severe growth retardation, intellectual been reported with a distal chromosome 20q deletion disability, decreased speech, intractable feeding diffi- including bands q13.1 and q13.3 without involvement culties, hypotonia and similar facial dysmorphism with 160 M.G. Butler et al. / 20q13.2-q13.33 deletion syndrome Table 1 Clinical features of subjects with a 20q13.2- q13.3 deletion Clinical features Subject 1 Subject 2 Current subject Geneviève et al.
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