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Translocation X;13 in a Patient with Retinoblastoma on September 28, 2021 by Guest

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Translocation X;13 in a Patient with Retinoblastoma on September 28, 2021 by Guest J Med Genet: first published as 10.1136/jmg.24.7.431 on 1 July 1987. Downloaded from Case reports 431 particular mosaics have an increased risk of abnor- the male where regular pairing of the X and Y mal offspring.6 It has also been suggested that the chromosomes as a bivalent is a prerequisite for increased risk of single organ malformations in the normal sperm formation." progeny of Turner and triple X women may be related to their premature ovarian ageing.7 In the present case, the mother had two or three miscar- References riages during her fertile years and following the birth 'Zakharov AF, Baranovskaya LI. X-X chromosome transloca- of the proband she suffered premature menopause. tions and their karyotype-phenotype correlations. In: Sandberg Gonadal dysgenesis is a constant feature of all X AA, ed. Cytogenetics ofthe mammalian X chromosome. Part B. New York: Alan R Liss, 1983. fusion chromosomes regardless of whether they are 2 Sarto GE, Therman E. Replication and inactivation of a attached by the long or the short arms, or whether dicentric X formed by telomeric fusion. Am Obstet Gynecol there is a 45,X cell line present. In the present case it 1980;136:904-8. is impossible to be certain whether she had truly 3Ferguson-Smith MA. Karyotype-phenotype correlations in gonadal dysgenesis and their bearing on the pathogenesis of completed pubertal development and had a men- malformations. J Med Genet 1965;2:142-55. arche, or whether the menstrual losses and secondary 4Jacobs PA. Structural abnormalities of the sex chromosomes. sex characteristics had been entirely produced by Br Med Bull 1969;25:94-9. exogenous hormones. However, by the time of Rivera H, Sole MT, Garcia-Cruz D, et al. On telomere replication and fusion in eukaryotes: a propos of a case of investigation the girl had ovarian failure associated 45,X/46,X,ter rea(X;X)(p223;p223). Cytogenet Cell Genet with dysgenetic ovaries. If, as indicated by the 1984;38:23-8. normal stature, there had been no loss of genetic 6 Dewhurst J. Fertility in 47,XXX and 45,X patients. J Med Genet material, this finding would confirm the belief that 1978;15:132-5. 7Fryns JP, Kleczkowska A, Petit P, et al. X-chromosome gonadal malfunction in Xp fusions cannot be ex- polysomy in the female: personal experience and review of the plained solely on the basis of Xp deletion.8 This had literature. Clin Genet 1983;23:341-9. previously been inferred from the finding that Ferraro M, De Capoa A, Mostacci C, et al. Cytogenctic and females with a deletion of the terminal portion of Xp clinical studies in gonadal dysgenesis with 46,X.Xt (qter-6p221::p223-*qter) karyotype: review and phenotype/ copyright. are fertile.9 10 There was a 45,X cell line in the karyotype correlations. J Med Genet 1980;17:457-63. lymphocytes and fibroblasts from gonadal tissue in 9Fraccaro M, Maraschio P, Pasquali F, et al. Women heterozy- this patient which could have influenced the de- gous for deficiency of the (p21-pter) region of the X velopment of the gonads, but in other cases of Xp chromosome are fertile. Hum Genet 1977;39:283-92. Fryns JP, Kleczkowska A, Petit P, et al. Fertility in patients with fusions without evidence of mosaicism gonadal X chromosome deletions. Clin Genet 1982;22:76-9. malfunction still occurs. It is possible that the actual Miklos GLG. Sex chromosotne pairing and male infertility. size of the abnormal chromosome leads to problems Cytogenet Cell Genet 1974;13:558-77. http://jmg.bmj.com/ in pairing at meiosis, so that the primary oocytes which rest in the first prophase of meiotic division Correspondence and requests for reprints to Mrs until puberty are unstable and consequently become I C S Barnes, Centre for Human Genetics, 117 atretic. This would be a similar situation to that of Manchester Road, Sheffield S10 5DN. Translocation X;13 in a patient with retinoblastoma on September 28, 2021 by guest. Protected G PONZIO*, E SAVIN*, G CATTANEOt, M P GHIOTTIt, A MARRAt, O ZUFFARDIt, AND C DANESINOt *Istituto di Genetica Medica, Universita di Torino; tOspedale di Santa Croce, Divisione di Pediatria, Moncalieri; and *Istituto di Biologia Generale e Genetica Medica, Universitai di Pavia, Italy. SUMMARY We describe the clinical and Retinoblastoma (Rb) is a childhood retinal cancer cytogenetic findings in a child with retinoblas- with an incidence of 1 in 20 000 births' that occurs as toma and a translocation between chromo- a sporadic or a hereditary disease, the latter being a somes X and 13. The X;13 translocation in this highly penetrant (95%) autosomal dominant trait. does not involve band the About 5% of retinoblastoma patients have a patient 13q14, chromosome aberration.2 This is usually an intersti- assigned locus for retinoblastoma. tial deletion of the region 13q14, but balanced Received for publication 10 February 1986. translocations3 with breakpoints in this region have Accepted for publication 21 April 1986. been reported, and the locus for Rb has been J Med Genet: first published as 10.1136/jmg.24.7.431 on 1 July 1987. Downloaded from 432 Case reports assigned to 13q14.11.4 Two female patients with blastoma. This was confirmed by a CT scan. At bilateral retinoblastoma and an apparently identical follow up, the child showed generalised hypotonia, (X;13) balanced translocation have been failure to thrive, severe psychomotor delay, and reported.5 6In both, the breakpoint on chromosome several episodes of pneumonia. She died at 18 13 was not at 13q14 but at 13q12, while the months. Necropsy showed severe hydrocephalus, breakpoint on the X chromosome was at p22. bilateral retinoblastoma without invasion of the We report here a third case of bilateral Rb in a optic nerve, bilateral bronchopneumonia, and hepa- patient with a translocation between chromosomes tic and renal congestion. No metastases were found X and 13 with different breakpoints, 46,X, in any of the organs examined. t(X;13)(ql2;q31). Case report Materials, methods, and results The female infant was born on 29.12.80 after an Chromosomes cultured from peripheral blood after uneventful 42 week pregnancy and weighed 2159 g GTG and RBA banding showed a balanced trans- (3rd centile). The father and mother were healthy location involving chromosomes X and 13: and unrelated and aged 29 and 27 at the time of 46,X,t(X;13)(ql2;q31) (fig 2). The replication pat- birth. At birth the infant showed hypertelorism, tern of the X chromosomes studied in lymphocytes strabismus, epicanthus, short philtrum, (50 mitoses) and in fibroblasts (28 mitoses) showed dolichocephaly, diastatic cranial sutures, facial that the normal X was consistently late replicating. asymmetry, and loose ligaments, and congenital The parents had normal chromosomes. Q banded bilateral opacity of the crystalline was observed soon studies from the proband and her parents did not afterwards (fig 1). There was no reaction to sound, reveal the origin of the translocation. light, or environmental stimuli. Later on, there was Esterase D (ESD) was assayed in erythrocytes a history of poor feeding, repeated infection, and and cultured fibroblasts by the method of Sparkes et irregular sleeping-waking pattern. al. 7 The levels of activity of ESD in erythrocytes andcopyright. No signs of rubella, cytomegalovirus, or herpes fibroblasts from the proband are compared with simplex infections were found. T3 and T4 levels, controls in the table. In the proband's erythrocytes, urinary mucopolysaccharides, lysosomal enzymes, the levels of ESD activity were higher than the mean immunoglobulins, serum amino acids, and proteins for the controls, while in fibroblasts they were were in the normal range. similar to those of controls. Arylsulphatase A An ultrasound examination of both eyes at 10 (ARSA), tested as a control enzyme, was assayed months suggested the presence of bilateral retino- according to Galjaard.8 http://jmg.bmj.com/ on September 28, 2021 by guest. Protected FIG 1 The patient at nine months ofage. -!., Al. J Med Genet: first published as 10.1136/jmg.24.7.431 on 1 July 1987. Downloaded from Case reports 433 A-_l N 4 W..i.. :.; i-m r-2 'I- A _w2 tj e - -_ 13 13; X X; 13 1 ' ; X y __ = 3 {i _ .......... .L. 2 '; *';n~~~~~~~~. )I I l x _ [ copyright. 13 13J X X; 13 http://jmg.bmj.com/ TABLE Levels of ESD activity in erythrocytes and the steps in the development of retinoblastoma. fibroblasts and of ARSA (the control enzyme) in the Cavanee et at) have shown that tumour cells are proband and a group of controls. All activities expressed as homozygous for some restriction fragment poly- nmollmglh. morphism of chromosome 13 or ESD type for which the patients were heterozygous. This supports the ESD ARSA hypothesis of Knudson't1 that Rb results from the on September 28, 2021 by guest. Protected Erythrocytes development of homozygosity for a mutant allele on Patient 84-5 Controls (SD) 48 95 (148(0) - chromosome 13. In the two X;13 translocations No 51 observed in patients with retinoblastoma,5 6 the Fibroblasts breakpoint on chromosome 13 was far away from Patient 171 () 588-1 the Rb locus. In fibroblasts (but not in lympho- Controls (SD) 230t19 (12924) 465 61 (211 69) No 17 4(0 cytes), this locus was, however, reached by the spreading of the inactivation from the X, resulting in a functional deletion. In one case it was possible to demonstrate that Discussion inactivation also extended to ESD, thus confirming inactivation of the 13q14 region.6 The association between chromosome 13 abnormali- The psychomotor retardation and growth impair- ties and retinoblastoma has been explained by ment observed in these two patients could also be assuming that the deletion caused by the effective or easily explained by the genetic imbalance present in functional loss of an allele at the Rb locus is one of cells with an inactivated der(X;13).
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