Author(s): Dryja TP, Rapaport J, McGee TL, Nork TM, Schwartz TL. Molecular etiology of low-penetrance retinoblastoma in two pedigrees. Am J Hum Genet. 1993 Jun;52(6):1122-8.
Journal: American Journal Of Human Genetics, Volume 52, Issue 6, Jun 1993
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.