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Increased homozygosity in the first Hispanic patient with plantar lipomatosis, unusual facies, and developmental delay (Pierpont syndrome): a case report
© The Author(s). 2016
Received: 12 February 2016
Accepted: 6 July 2016
Published: 12 August 2016
Pierpont syndrome was first described in 1998 with key characteristics including developmental delay, dysmorphic facial features, fat pads on hands and feet, and feeding difficulties. To date the mechanism of inheritance is unknown. Nine out of ten previously described patients with Pierpont syndrome were boys. This is the first report of a case of a non-white patient with Pierpont syndrome and she is the second female patient to be described as having Pierpont syndrome.
Our patient is a 16-month-old Hispanic girl with extreme developmental delay, microcephaly, large ears, short and thick upper lip, broad philtrum, widely spaced teeth, constipation, dysphagia, fat pads on feet and hands, autistic behavior and seizure-like episodes. She had a normal karyotype (46,XX), and array testing showed greater than 8 % homozygosity with otherwise normal results. Genes within these areas of homozygosity may provide clues to an etiology and suggest autosomal recessive inheritance. This case report highlights the possibility of ethnic variations in this syndrome’s presentation, which may have ramifications in uncovering the pathogenesis as well as expanding the phenotype.
Pierpont syndrome should be considered in the evaluation of children with the described features, regardless of their gender and ethnicity.
The combined characteristics of plantar lipomatosis, unusual facies, and developmental delay are known as Pierpont syndrome [PS]. There have been a total of ten cases of PS reported since its initial description [1–3]. Key characteristics of the syndrome include neurodevelopmental delay, dysmorphic facial features, fat pads on feet and hands, and feeding difficulties. The mechanism of inheritance is unknown. All previous cases described have been in the white race of which nine out of ten were boys. Our patient represents the first non-white and the second female to be identified with PS.
A 16-month-old Hispanic girl presented to a genetics clinic with developmental delay and abnormal facial features. She was born at term to unrelated parents. Her mother and father’s ages were 29 and 30 years respectively. Her two older sisters are both healthy with normal development. There is no family history of a child with intellectual disability or similar findings. The maternal grandmother had a baby who died at 1 week of age with multiple birth defects.
Developmental delay was first noticed at 4 months of age and she was referred for early interventional therapy. When she was first seen in the genetics clinic at 16 months, she only made whining noises, did not make eye contact, and could not sit upright, crawl, or rollover. She made poor eye contact and had episodes of inconsolable agitation with self-mutilation. She had constipation, abdominal bloating, and only tolerated pureed food. She developed a periorbital urticarial rash and tested positive for multiple food allergies.
She had a normal karyotype (46,XX). A chromosomal microarray analysis (CMA) using the Affymetrix Genome-wide Human Single Nucleotide Polymorphism (SNP) Array 6.0 revealed 118 independent regions of homozygosity. These ranged from 1 Mb to 5.8 Mb and encompassed 8 % of her genome. She was enrolled in a whole exome study run by Baylor College of Medicine, USA.
Features in our patient that are similar to other children with PS include developmental delay, midface hypoplasia, large ears, widely spaced teeth, prominent digit pads, fat pads anteromedial to the heels, and feeding difficulties [1–4]. Features that are unique to our patient include neutral palpebral fissures, normal nose size, and supernumerary nipples. These differences may represent ethnic or gender variations that allow for the expansion of the PS phenotype.
All previously described patients with PS had normal karyotypes. The patient described by Oudesluijs et al. in 2005 had a normal whole genome microarray . Of the seven patients described by Wright et al. in 2011, three did not have array investigations, three had normal array studies, and one had a 250K array with a 3.17 Mb loss at 10q21.3 that was verified by fluorescence in situ hybridization (FISH) in a monozygotic twin and their mother .
Four of the 172 recessive genes in the areas of homozygosity are associated with phenotypes similar to our patient
Associated syndrome or phenotype gene
ARID1A gene at 1p35.3
PIGV at 1p36.11
Hyperphosphatasia with mental retardation
POC1A at 3p21.2
Short stature, onychodysplasia, facial dysmorphism, and hypotrichosis (SOFT) syndrome
CDK5RAP2 at 9q33.2
The mechanism of inheritance of PS is unknown. The finding of 8 % homozygosity in this patient may suggest autosomal recessive inheritance. PS should be considered in children with the described features, regardless of their gender and ethnicity.
CMA, chromosomal microarray analysis; FISH, fluorescence in situ hybridization; PS, Pierpont syndrome; SNP, single nucleotide polymorphism; SOFT, short stature, onychodysplasia, facial dysmorphism, and hypotrichosis
We thank the patient’s family for their kind permission to allow us to publish our findings on their daughter. We would also like to thank Dr Pierpont for taking the time to review the photos of our patient.
SOK, DW, JH, and KS all took care of the patient during a hospital stay or in the genetics clinic. JW analyzed and interpreted the patient microarray of this patient. All authors listed were involved in drafting the manuscript, revising it critically for important intellectual content, and read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient’s parents (legal guardians) for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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