A candidate gene for congenital bilateral isolated ptosis identified by molecular analysis of a de novo balanced translocation.

Published

Journal Article

Ptosis is defined as drooping of the upper eyelid and can impair full visual acuity. It occurs in a number of forms including congenital bilateral isolated ptosis, which may be familial and for which two linkage groups are known on chromosomes 1p32-34.1 and Xq24-27.1. We describe the analysis of the chromosome breakpoints in a patient with congenital bilateral isolated ptosis and a de novo balanced translocation 46,XY,t(1;8)(p34.3;q21.12). Both breakpoints were localized by fluorescence in situ hybridisation with yeast artificial chromosomes, bacterial artificial chromosomes and P1 artificial chromosomes. The derived chromosomes were isolated by flow-sorting, amplified by degenerate oligonucleotide-primed polymerase chain reaction and analyzed by sequence tagged sites amplification to map the breakpoints at a resolution that enabled molecular characterization by DNA sequencing. The 1p breakpoint lies ~13 Mb distal to the previously reported linkage locus at 1p32-1p34.1 and does not disrupt a coding sequence, whereas the chromosome 8 breakpoint disrupts a gene homologous to the mouse zfh-4gene. Murine zfh-4 codes for a zinc finger homeodomain protein and is a transcription factor expressed in both muscle and nerve tissue. Human ZFH-4 is therefore a candidate gene for congenital bilateral isolated ptosis.

Full Text

Duke Authors

Cited Authors

  • McMullan, TW; Crolla, JA; Gregory, SG; Carter, NP; Cooper, RA; Howell, GR; Robinson, DO

Published Date

  • March 2002

Published In

Volume / Issue

  • 110 / 3

Start / End Page

  • 244 - 250

PubMed ID

  • 11935336

Pubmed Central ID

  • 11935336

International Standard Serial Number (ISSN)

  • 0340-6717

Digital Object Identifier (DOI)

  • 10.1007/s00439-002-0679-5

Language

  • eng

Conference Location

  • Germany