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FRAXAC2 distribution was significantly different among all three populations, but because this flanking marker includes three sites of variation it may be too complex to interpret with respect to population dynamics of the FMR1 repeat. Interestingly in each population, the majority of repeat length alleles http://www.selleckchem.com/products/Adriamycin.html of FRAXA were comprised of 30 and 29 CGG repeats, even though the distribution of the alleles varied between the Caucasians and both populations of African descent (Fig 3A). These common alleles were also observed as most common in other West African populations including the Bamileke (Chiurazzi et al., 1996a) Wolof, Mandinka (Kunst et al., 1996) and Mbuti pygmy of Central Africa (Eichler & Nelson, 1996). Similarly in other world populations, http://www.selleck.cn/products/MK-1775.html 30 and 29 repeats were the most common in Caucasians (Malmgren et al., 1994; Haataja et al., 1994; Kunst et al., 1996; Chiurazzi et al., 1996a), South Americans comprising Brazilians with varied ancestry (Mingroni-Netto et al., 2002), Chilean populations (Jara et al., 1998), several Asian populations including Chinese, Malays (Zhou et al., 2006) and Taiwanese (Chiu et al., 2008). However, this pattern is not always the case: in a Japanese sample, 27 repeat alleles were the most common (Otsuka et al., 2009) and in a Mexican sample, 32 repeats were the most common (Rosales-Reynoso et al., 2005). However these populations also contained the 30 and 29 peaks in lower frequencies. Thus, although it is likely that the 29 or 30 repeat allele is the ancestral allele, founder effects due to geographic and cultural isolation or complex interactions of populations have altered the frequency distributions (Eichler & Nelson, 1996). In the Ghanaian sample, the common interruption patterns were 10 + 9 + 9 (30 repeats) and 9 + 9 + 9 (29 repeats), similar to those previously reported for other African and Caucasian populations (Eichler & Nelson, 1996; Kunst et al., 1996). These structures contain two AGG interruptions that are less likely to expand compared to other AGG interspersion patterns (Eichler et al., 1994; Gunter et al., 1998). A surprising finding in the Ghanaian sample is the relatively large percentage of structures with pure repeats (Table 2), 18% (20/110) among repeats less than 35 and 44% (4/9) among those with 35�C54 (i.e. intermediate alleles). This structure is highly susceptible for expansion. http://www.selleckchem.com/PD-1-PD-L1.html These frequencies are similar to those reported for a Tunisian Jewish population (Falik-Zaccai et al., 1997; Patsalis et al., 1999). In that study, the longer pure repeat alleles were all found on a specific haplotype background that was also associated with full mutations (7+-4-6+). The alleles with shorter pure repeats (