title: Molecular etiology of low-penetrance retinoblastoma in two pedigrees.
abstract: In one family with low-penetrance retinoblastoma, a germ-line deletion is shared by affected and unaffected, obligate carriers. The deletion encompasses exon 4 of the retinoblastoma gene and corresponds to a mutant protein without residues 127-166. In a second family, RFLP analysis shows that two distant relatives have independently derived mutations. These families, together with others reported elsewhere, indicate that attributes of alleles at the retinoblastoma locus specify penetrance.
authors.affiliation: Department of Ophthalmology, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston 02114.
authors.forename: T P
authors.initials: TP
authors.lastname: Dryja
authors.forename: J
authors.initials: J
authors.lastname: Rapaport
authors.forename: T L
authors.initials: TL
authors.lastname: McGee
authors.forename: T M
authors.initials: TM
authors.lastname: Nork
authors.forename: T L
authors.initials: TL
authors.lastname: Schwartz
mesh_terms: D001483:Base Sequence; D004277:DNA, Single-Stranded; D005260:Female; D017353:Gene Deletion; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D010375:Pedigree; D012150:Polymorphism, Restriction Fragment Length; D012175:Retinoblastoma / Q000235:genetics*
chemical_list: D004277:DNA, Single-Stranded