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Table of Contents
Vol. 25, No. 6, 1975
Issue release date: 1975
Hum Hered 1975;25:442–452
(DOI:10.1159/000152759)

Partial D 15 Trisomy

A Case and General Review

Centerwall W.R. · Morris J.P.
Genetics and Chromosome Services, Loma Linda University Medical Center, Loma Linda, San Bernardino County General Hospital, San Bernardino, Calif.

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Abstract

A profoundly retarded girl with cyanotic congenital heart disease, recurrent myoclonic seizures, an external strabismus and not very unusual facial features was found to have a 47, XX chromosome complement. The extra chromosome is a small G-size chromosome with small projections extending from the ends of the long arms and no satellites observed on the short arms. By Giemsa-trypsin banding techniques this aberrant chromosome appears to be a partially deleted D 15 chromosome. A comparison of the clinical features is made with those described in the nine other reported specifically identified cases of ‘partial trisomy 15’. For clinical and chromosome morphology reasons, this was felt not to be trisomy in the G group nor an extra Y. We speculate that the long arm projections are satellites derived from a ring-type intrachromosomal translocation.



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