PMID- 17884123 OWN - NLM STAT- MEDLINE DCOM- 20080227 LR - 20071029 IS - 0040-5809 (Print) IS - 0040-5809 (Linking) VI - 72 IP - 4 DP - 2007 Dec TI - The SMM model as a boundary value problem using the discrete diffusion equation. PG - 539-46 AB - A generalized single-step stepwise mutation model (SMM) is developed that takes into account an arbitrary initial state to a certain partial difference equation. This is solved in both the approximate continuum limit and the more exact discrete form. A time evolution model is developed for Y DNA or mtDNA that takes into account the reflective boundary modeling minimum microsatellite length and the original difference equation. A comparison is made between the more widely known continuum Gaussian model and a discrete model, which is based on modified Bessel functions of the first kind. A correction is made to the SMM model for the probability that two individuals are related that takes into account a reflecting boundary modeling minimum microsatellite length. This method is generalized to take into account the general n-step model and exact solutions are found. A new model is proposed for the step distribution. FAU - Campbell, Joel AU - Campbell J AD - NASA Langley Research Center, MS 488, Hampton, VA 23681, USA. joel.f.campbell@nasa.gov LA - eng PT - Journal Article DEP - 20070819 PL - United States TA - Theor Popul Biol JT - Theoretical population biology JID - 0256422 SB - IM MH - *Algorithms MH - Genetic Drift MH - Humans MH - Microsatellite Repeats/genetics MH - *Models, Genetic MH - *Mutation MH - Normal Distribution EDAT- 2007/09/22 09:00 MHDA- 2008/02/28 09:00 CRDT- 2007/09/22 09:00 PHST- 2007/03/28 00:00 [received] PHST- 2007/06/10 00:00 [revised] PHST- 2007/08/03 00:00 [accepted] PHST- 2007/09/22 09:00 [pubmed] PHST- 2008/02/28 09:00 [medline] PHST- 2007/09/22 09:00 [entrez] AID - S0040-5809(07)00086-X [pii] AID - 10.1016/j.tpb.2007.08.001 [doi] PST - ppublish SO - Theor Popul Biol. 2007 Dec;72(4):539-46. doi: 10.1016/j.tpb.2007.08.001. Epub 2007 Aug 19.