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Genome imprinting phenomena on mouse chromosome 7

Published online by Cambridge University Press:  14 April 2009

Antony G. Searle  and
Colin V. Beechey
Antony G. Searle*
Affiliation:
Medical Research Council, Radiobiology Unit, Chilton, Didcot, Oxon OX11 0RD
Colin V. Beechey
Affiliation:
Medical Research Council, Radiobiology Unit, Chilton, Didcot, Oxon OX11 0RD
*
* Corresponding author.
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Heterozygotes for the reciprocal translocation T(7;15)9H were intercrossed, with albino (c) and underwhite (uw) as genetic markers, in order to study genetic complementation in mouse chromosome 7. Chromosome 15 is known to show normal complementation. Neither reciprocal cross in which one parent was c/c and the other wild type yielded albino progeny at birth although about 17% would be expected, but albino foetuses were recovered when the mother was c/c and father wild type. These products of maternal duplication/paternal deficiency for distal 7 were markedly retarded with small placentae. No albino foetuses were found when the father was c/c and mother wild type, which suggested earlier lethality. Equivalent crosses with uw (chromosome 15) as proximal marker gave normal underwhite progeny when the mother was uw/uw but small placentae, retardation and neonatal death of presumptive underwhites in the reciprocal cross. These abnormal newborn would have had a maternal duplication/paternal deficiency for proximal 7. These and other findings indicate that one region of defective complementation probably lies distal to the breakpoint of T(7;18)50H at 7E2-F2, while another is between the centromere and 7B3. Examination of man-mouse homologies suggests that the loci for three pathological human conditions (Beckwith-Weidemann syndrome, dystrophia myotonia and rhabdomyosarcoma) with differential parental transmission may be located in homologous regions to those affected by imprinting phenomena on mouse chromosome 7.

Type
Research Article
Information
Genetics Research , Volume 56 , Issue 2-3 , October 1990 , pp. 237 - 244
Copyright
Copyright © Cambridge University Press 1990

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