2
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Trisomía 9p: Una breve descripción clínica, diagnóstica y terapéutica Translated title: Trisomy 9p: A brief clinical, diagnostic and therapeutic description

      brief-report

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          La trisomía del 9p se caracteriza por la duplicación de todo o de algún segmento del brazo corto del cromosoma 9. Es una de las anomalías autosómicas estructurales más frecuentes en recién nacidos. Esta región es relativamente pobre en genes, por lo que puede ser más compatible con la supervivencia. Se caracteriza por presentar retraso del crecimiento, psicomotor y mental, dismorfias cráneo-faciales, alteraciones esqueléticas, así como anomalías en el sistema nervioso central, cardiopatías congénitas y alteraciones renales en menor frecuencia. Para realizar el diagnóstico, debe desarrollarse el estudio citogenético mediante la técnica de banda G, y, si está disponible, se recomienda la hibridación por fluorescencia in situ, complementada por la hibridación genómica comparativa, para la mejor comprensión de la correlación genotipo-fenotipo. La evaluación debe ser interdisciplinaria, en la que se incluya un oportuno asesoramiento genético familiar y, con ello, las opciones terapéuticas disponibles y de forma precoz.

          Translated abstract

          Trisomy 9p is characterized by the partial or complete duplication of the short arm of chromosome 9. It is one of the most common autosomal structural abnormalities in newborn infants. This is a relatively poor gene region, so it may be more compatible with survival. It is characterized by delayed mental and psychomotor growth, craniofacial dysmorphisms, skeletal alterations, central nervous system abnormalities, congenital heart disease, and, to a lesser extent, kidney disorders. To establish a diagnosis, it is necessary to perform a cytogenetic study with G bands and, if available, fluorescence in situ hybridization complemented with comparative genomic hybridization for a better understanding of the genotype-phenotype correlation. Assessment should be interdisciplinary and encompassing a timely family genetic counseling, together with available therapeutic options in an early manner.

          Related collections

          Most cited references18

          • Record: found
          • Abstract: found
          • Article: found
          Is Open Access

          Duplication 9p and their implication to phenotype

          Background Trisomy 9p is one of the most common partial trisomies found in newborns. We report the clinical features and cytogenomic findings in five patients with different chromosome rearrangements resulting in complete 9p duplication, three of them involving 9p centromere alterations. Methods The rearrangements in the patients were characterized by G-banding, SNP-array and fluorescent in situ hybridization (FISH) with different probes. Results Two patients presented de novo dicentric chromosomes: der(9;15)t(9;15)(p11.2;p13) and der(9;21)t(9;21)(p13.1;p13.1). One patient presented two concomitant rearranged chromosomes: a der(12)t(9;12)(q21.13;p13.33) and an psu i(9)(p10) which showed FISH centromeric signal smaller than in the normal chromosome 9. Besides the duplication 9p24.3p13.1, array revealed a 7.3 Mb deletion in 9q13q21.13 in this patient. The break in the psu i(9)(p10) probably occurred in the centromere resulting in a smaller centromere and with part of the 9q translocated to the distal 12p with the deletion 9q occurring during this rearrangement. Two patients, brother and sister, present 9p duplication concomitant to 18p deletion due to an inherited der(18)t(9;18)(p11.2;p11.31)mat. Conclusions The patients with trisomy 9p present a well-recognizable phenotype due to facial appearance, although the genotype-phenotype correlation can be difficult due to concomitant partial monosomy of other chromosomes. The chromosome 9 is rich in segmental duplication, especially in pericentromeric region, with high degree of sequence identity to sequences in 15p, 18p and 21p, chromosomes involved in our rearrangements. Thus, we suggest that chromosome 9 is prone to illegitimate recombination, either intrachromosomal or interchromosomal, which predisposes it to rearrangements, frequently involving pericentromeric regions.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: found
            Is Open Access

            Long-term auxological and endocrinological evaluation of patients with 9p trisomy: a focus on the growth hormone-insulin-like growth factor-I axis

            Background Trisomy 9p is an uncommon anomaly characterised by mental retardation, head and facial abnormalities, congenital heart defects, kidney abnormalities, and skeletal malformations. Affected children may also show growth and puberty retardation with delayed bone age. Auxological and endocrinological data are lacking for this syndrome. Methods We describe three girls and one boy with 9p trisomy showing substantial growth failure, and we evaluate the main causes of their short stature. Results The target height was normal in all families, ranging from 0.1 and -1.2 standard deviation scores (SDS). The patients had a low birth-weight (from -1.2 to -2.4 SDS), birth length (from -1.1 to -3.2 SDS), and head circumference (from -0.5 to -1.6 SDS). All patients presented with substantial growth (height) retardation at the time of 9p trisomy diagnosis (from -3.0 to -3.8 SDS). The growth hormone stimulation test revealed a classic growth hormone (GH) deficiency (GHD) in patients 1, 3, and 4. In contrast, patient 2 was determined to have a GH neurosecretory dysfunction (GHNSD). The plasma concentrations of IGF-I and IGFBP-3 were low in all patients for their ages and sexes (from -2.0 to -3.4 SDS, and from -1.9 to -2.8 SDS, respectively). The auxological follow-up showed that those patients who underwent rhGH treatment exhibited a very good response to the GH therapy, whereas patients 3 and 4, whose families chose not to use rhGH treatment, did not experience any significant catch-up growth. Conclusions GH deficiency appears to be a possible feature of patients with 9p trisomy syndrome. These patients, particularly those with growth delays, should be evaluated for GH secretion.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Characterization of partial trisomy 9p due to insertional translocation by chromosomal (micro)FISH.

              We describe a family with an insertion 12;9 translocation occurring in a balanced form in a mother and two sons, but in an unbalanced form in the proband, resulting in trisomy of chromosome region 9p22-->9p24. The proband manifests typical features of trisomy 9p; the clinical signs were mental and growth retardation, microcephaly, epicanthus, low-set ears, micrognathia, clinodactyly and hypoplastic phalanges of the fifth fingers, hypoplasia or absence of toenails, and extremely small genitals. The GTG-banded findings were confirmed using (micro)FISH. Intriguingly, the mother and the two carrier sons exhibited major learning difficulties that were not present in the non-carrier sister of the mother: this may be due to a gene disruption or induction of abnormal expression. Dysmorphic features were not present in the three carriers. We compare our clinical and cytogenetic findings with other cases of partial trisomy 9p reported in the literature.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Journal
                aap
                Archivos argentinos de pediatría
                Arch. argent. pediatr.
                Sociedad Argentina de Pediatría (Buenos Aires, , Argentina )
                0325-0075
                1668-3501
                October 2019
                : 117
                : 5
                : e473-e476
                Affiliations
                [01] orgnameUniversidad de Los Andes orgdiv1Facultad de Medicina orgdiv2Departamento de Puericultura y Pediatría Venezuela
                Article
                S0325-00752019000500014 S0325-0075(19)11700500014
                10.5546/aap.2019.e473
                e0785d32-4fa4-4b37-984e-a4cff5c61de4

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 11 September 2018
                : 25 March 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 18, Pages: 0
                Product

                SciELO Argentina

                Categories
                Artículos especiales

                Tratamiento,Trisomía 9p,Diagnóstico,Trisomy 9p,Diagnosis,Genetic counseling,Treatment,Asesoramiento genético

                Comments

                Comment on this article