Origins of accessory small ring marker chromosomes derived from chromosome 1.

Abstract:

:Three patients with accessory small ring chromosomes derived from chromosome 1 are presented together with additional clinical details and cytogenetic analyses of a previously reported patient. Cytogenetic analysis was undertaken by FISH using a reverse painting probe generated from one of the patients by microdissection of the r(1) chromosome and with a BAC923C6 which maps to 1p12. Results indicated that patients with r(1) chromosomes consisting of 1q12 heterochromatin and short arm pericentric euchromatin which extends to at least the BAC923C6 were associated with a normal or mild phenotype. Patients with abnormal phenotypes possessed two types of rings. One patient had evidence for contiguous pericentric short arm euchromatin which extended from the centromere to beyond the BAC923C6. Two patients showed molecular cytogenetic results which were compatible with non-contiguous chromosome 1 euchromatin. The diversity of origin of r(1)s will hamper attempts to define phenotype/genotype relationships.

journal_name

J Med Genet

authors

Callen DF,Eyre H,Fang YY,Guan XY,Veleba A,Martin NJ,McGill J,Haan EA

keywords:

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

847-53

issue

11

eissn

0022-2593

issn

1468-6244

journal_volume

36

pub_type

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