Biomaterial Database

De novo Unbalanced 1;22 Translocation with 22q11 Deletion Syndrome. 2019

Spiros Vittas, and George Efstathiou, and Christos Tsakalidis, and Christina Malamaki, and Vasiliki Antari, and Efthymia Chatzitoliou, and Ilias Chatziioannidis, and Assimina Galli-Tsinopoulou, and Vasiliki Soubasi

This report describes a newborn girl presenting with some of the common features of DiGeorge syndrome/velocardiofacial syndrome (DGS/VCFS), including hypocalcemia, atrial septal defect, and aortic stenosis. Several genetic tests were carried out to determine the origin of the clinical phenotype. MLPA was initially performed followed by aCGH, cytogenetic analysis, and FISH. Cytogenetic analysis of the proband's parents was also done. MLPA revealed a deletion in 22q11.1q11.2 spanning from the cat eye syndrome region to the most commonly deleted region in DGS/VCFS patients. The size of the deletion as defined by aCGH was 3.2 Mb. The karyotype of the proband was 45,XX,der(1)t(1;22)(p36.3;q11.2)dn,-22, the karyotypes of the parents were normal. FISH analysis showed that the 22q11 deletion occurred in the der(1). No loss or gain of chromosomal material was evident for chromosome 1, as confirmed by MLPA, aCGH, and FISH. Unbalanced translocations resulting in DGS are relatively rare, with limited reports in the literature. To our knowledge, this is the second case involving chromosome 1 and the first one with breakpoints in 1p36 and 22q11.2. This case also emphasizes the importance of combining diagnostic methods to better understand a given genetic abnormality.

UI	MeSH Term	Description	Entries
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D002878	Chromosomes, Human, Pair 1	A specific pair of human chromosomes in group A (CHROMOSOMES, HUMAN, 1-3) of the human chromosome classification.	Chromosome 1
D002892	Chromosomes, Human, Pair 22	A specific pair of GROUP G CHROMOSOMES of the human chromosome classification.	Chromosome 22
D004062	DiGeorge Syndrome	Congenital syndrome characterized by a wide spectrum of characteristics including the absence of the THYMUS and PARATHYROID GLANDS resulting in T-cell immunodeficiency, HYPOCALCEMIA, defects in the outflow tract of the heart, and craniofacial anomalies.	Velocardiofacial Syndrome,22q11.2 Deletion Syndrome,22q11.2DS,Autosomal Dominant Opitz G-Bbb Syndrome,Catch22,Conotruncal Anomaly Face Syndrome,Conotruncal Anomaly Face Syndrome (CTAF),Deletion 22q11.2 Syndrome,DiGeorge Anomaly,DiGeorge Sequence,Familial Third and Fourth Pharyngeal Pouch Syndrome,Hypoplasia of Thymus and Parathyroids,Pharyngeal Pouch Syndrome,Sedlackova Syndrome,Shprintzen Syndrome,Shprintzen VCF Syndrome,Third and Fourth Pharyngeal Pouch Syndrome,Thymic Aplasia Syndrome,VCF Syndrome,Velo-Cardio-Facial Syndrome,Autosomal Dominant Opitz G Bbb Syndrome,Deletion Syndrome, 22q11.2,Syndrome, DiGeorge,Syndrome, Sedlackova,Syndrome, Shprintzen,Syndrome, VCF,Syndrome, Velo-Cardio-Facial,Syndrome, Velocardiofacial,Velo Cardio Facial Syndrome
D005260	Female		Females
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013577	Syndrome	A characteristic symptom complex.	Symptom Cluster,Cluster, Symptom,Clusters, Symptom,Symptom Clusters,Syndromes
D014178	Translocation, Genetic	A type of chromosome aberration characterized by CHROMOSOME BREAKAGE and transfer of the broken-off portion to another location, often to a different chromosome.	Chromosomal Translocation,Translocation, Chromosomal,Chromosomal Translocations,Genetic Translocation,Genetic Translocations,Translocations, Chromosomal,Translocations, Genetic
D017384	Sequence Deletion	Deletion of sequences of nucleic acids from the genetic material of an individual.	Deletion Mutation,Deletion Mutations,Deletion, Sequence,Deletions, Sequence,Mutation, Deletion,Mutations, Deletion,Sequence Deletions
D017404	In Situ Hybridization, Fluorescence	A type of IN SITU HYBRIDIZATION in which target sequences are stained with fluorescent dye so their location and size can be determined using fluorescence microscopy. This staining is sufficiently distinct that the hybridization signal can be seen both in metaphase spreads and in interphase nuclei.	FISH Technique,Fluorescent in Situ Hybridization,Hybridization in Situ, Fluorescence,FISH Technic,Hybridization in Situ, Fluorescent,In Situ Hybridization, Fluorescent,FISH Technics,FISH Techniques,Technic, FISH,Technics, FISH,Technique, FISH,Techniques, FISH