PMID- 9792200 OWN - NLM STAT- MEDLINE DCOM- 19990105 LR - 20190822 IS - 0306-9877 (Print) IS - 0306-9877 (Linking) VI - 51 IP - 3 DP - 1998 Sep TI - Expanded (CAG)n, (CGG)n and (GAA)n trinucleotide repeat microsatellites, and mutant purine synthesis and pigmentation genes cause schizophrenia and autism. PG - 223-33 AB - Unstable (CAG)n trinucleotide repeat microsatellites are hypothesized to cause schizophrenia. The (CAG)n microsatellite of dominant spinal cerebellar ataxia type 1 (SCA1) is a candidate schizophrenia gene. Autism results from expansions of (CGG)n and (GAA)n trinucleotide repeat stretches at fragile X syndrome (FRAXA), and the recessive Friedreich's ataxia (FA). Dominant ataxia genes may cause schizophrenia and recessive ataxia genes may cause autism. Syndromes with autism show purine synthesis defects (PSDs) and/or pigmentation defects (PDs). Autism is caused by very lengthy expansions of (CAG)n, (CGG)n and (GAA)n repeats, while schizophrenia results from much smaller (CAG)n and (CGG)n repeat expansions. FAU - Fischer, K M AU - Fischer KM LA - eng PT - Journal Article PL - United States TA - Med Hypotheses JT - Medical hypotheses JID - 7505668 RN - 0 (Purines) SB - IM MH - Animals MH - Autistic Disorder/*genetics MH - Fragile X Syndrome/genetics MH - Friedreich Ataxia/genetics MH - Genes, Dominant MH - Humans MH - *Models, Genetic MH - Pigmentation/*genetics MH - Purines/*biosynthesis MH - Schizophrenia/*genetics MH - Trinucleotide Repeat Expansion/*genetics EDAT- 1998/10/29 00:00 MHDA- 1998/10/29 00:01 CRDT- 1998/10/29 00:00 PHST- 1998/10/29 00:00 [pubmed] PHST- 1998/10/29 00:01 [medline] PHST- 1998/10/29 00:00 [entrez] AID - S0306-9877(98)90080-9 [pii] AID - 10.1016/s0306-9877(98)90080-9 [doi] PST - ppublish SO - Med Hypotheses. 1998 Sep;51(3):223-33. doi: 10.1016/s0306-9877(98)90080-9.