PMID- 7902670 OWN - NLM STAT- MEDLINE DCOM- 19931230 LR - 20200824 IS - 0002-9297 (Print) IS - 1537-6605 (Electronic) IS - 0002-9297 (Linking) VI - 53 IP - 6 DP - 1993 Dec TI - Homozygotes for the autosomal dominant neoplasia syndrome (MEN1). PG - 1167-72 AB - Families in which both parents are heterozygotes for the same autosomal dominant neoplasia syndrome are extremely unusual. Recently, we had the unique opportunity to evaluate three symptomatic siblings from the union between two unrelated individuals affected by multiple endocrine neoplasia type 1 (MEN1). When the three siblings and their parents and relatives were genotyped for 12 markers tightly linked to the MEN1 locus, at 11q13, two of the siblings were found to be homozygotes, and one a heterozygote, for MEN1. With regard to the MEN1 syndrome, no phenotypic differences were observed between the two homozygotes and the heterozygotes. However, the two homozygotes showed unexplained infertility, which was not the case for any of the heterozygotes. Thus, MEN1 appears to be a disease with complete dominance, and the presence of two MEN1 alleles with mutations of the type that occur constitutionally may be insufficient for tumor development. FAU - Brandi, M L AU - Brandi ML AD - Department of Clinical Physiopathology, University of Florence, Italy. FAU - Weber, G AU - Weber G FAU - Svensson, A AU - Svensson A FAU - Falchetti, A AU - Falchetti A FAU - Tonelli, F AU - Tonelli F FAU - Castello, R AU - Castello R FAU - Furlani, L AU - Furlani L FAU - Scappaticci, S AU - Scappaticci S FAU - Fraccaro, M AU - Fraccaro M FAU - Larsson, C AU - Larsson C LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Am J Hum Genet JT - American journal of human genetics JID - 0370475 RN - 0 (Genetic Markers) SB - IM GS - MEN1 MH - Adrenal Cortex Neoplasms/genetics MH - Adult MH - Aged MH - *Chromosomes, Human, Pair 11 MH - Female MH - *Genes, Dominant MH - Genetic Markers MH - Genotype MH - Haplotypes MH - *Homozygote MH - Humans MH - Hypercalcemia/genetics MH - Hyperparathyroidism/genetics/surgery MH - Hyperplasia MH - Infertility/genetics MH - Karyotyping MH - Male MH - Middle Aged MH - Multiple Endocrine Neoplasia/*genetics MH - Pancreatic Neoplasms/*genetics MH - Parathyroid Glands/pathology MH - Pedigree MH - Pituitary Neoplasms/genetics MH - Polymorphism, Restriction Fragment Length PMC - PMC1682503 EDAT- 1993/12/01 00:00 MHDA- 1993/12/01 00:01 PMCR- 1994/06/01 CRDT- 1993/12/01 00:00 PHST- 1993/12/01 00:00 [pubmed] PHST- 1993/12/01 00:01 [medline] PHST- 1993/12/01 00:00 [entrez] PHST- 1994/06/01 00:00 [pmc-release] PST - ppublish SO - Am J Hum Genet. 1993 Dec;53(6):1167-72.