Abstract:
:Two female identical twins who were clinically normal were obligatory heterozygotes for X-linked deuteranomaly associated with a green-red fusion gene derived from their deuteranomalous father. On anomaloscopy, one of the twins was phenotypically deuteranomalous while the other had normal color vision. The color vision-defective twin had two sons with normal color vision and one deuteranomalous son. X-inactivation analysis was done with the highly informative probe M27 beta. This probe detects a locus (DXS255) which contains a VNTR and which is somewhat differentially methylated on the active and inactive X chromosomes. In skin cells of the color vision-defective twin, almost all paternal X chromosomes with the abnormal color-vision genes were active, thereby explaining her color-vision defect. In contrast, a different pattern was observed in skin cells from the woman with normal color vision; her maternal X chromosome was mostly active. However, in blood lymphocytes, both twins showed identical patterns with mixtures of inactivated maternal and paternal X chromosomes. Deuteranomaly in one of the twins is explained by extremely skewed X inactivation, as shown in skin cells. Failure to find this skewed pattern in blood cells is explained by the sharing of fetal circulation and exchange of hematopoietic precursor cells between twins. These data give evidence for X inactivation of the color-vision locus and add another MZ twin pair with markedly different X-inactivation patterns for X-linked traits.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Jørgensen AL,Philip J,Raskind WH,Matsushita M,Christensen B,Dreyer V,Motulsky AGsubject
Has Abstractpub_date
1992-08-01 00:00:00pages
291-8issue
2eissn
0002-9297issn
1537-6605journal_volume
51pub_type
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
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pub_type: 杂志文章
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
pub_type: 杂志文章
doi:
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journal_title:American journal of human genetics
pub_type: 杂志文章
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更新日期:1993-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-01-03 00:00:00
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journal_title:American journal of human genetics
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doi:
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
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更新日期:1983-03-01 00:00:00
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journal_title:American journal of human genetics
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journal_title:American journal of human genetics
pub_type: 杂志文章
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更新日期:1989-12-01 00:00:00
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journal_title:American journal of human genetics
pub_type: 杂志文章
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