Open Access Research

Possible association between common variants of the phenylalanine hydroxylase (PAH) gene and memory performance in healthy adults

Toshiya Teraishi, Daimei Sasayama, Hiroaki Hori, Noriko Yamamoto, Takashi Fujii, Junko Matsuo, Anna Nagashima, Yukiko Kinoshita, Kotaro Hattori, Miho Ota, Sayaka Fujii and Hiroshi Kunugi*

Author Affiliations

Department of Mental Disorder Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, 4-1-1, Ogawahigashi, Kodaira, Tokyo 187-8502, Japan

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Behavioral and Brain Functions 2013, 9:30  doi:10.1186/1744-9081-9-30

Published: 30 July 2013

Abstract

Background

Phenylalanine hydroxylase (PAH) is the enzyme that metabolizes phenylalanine, an essential amino acid required for catecholamine synthesis. Rare mutations in PAH are causal to phenylketonuria (PKU), an autosomal recessive disease characterized by neuropsychiatric symptoms including intellectual disability. We examined whether there is an association between common single nucleotide polymorphisms (SNPs) of PAH and memory performance in the Japanese population.

Methods

Subjects were 599 healthy adults (166 males and 433 females; mean age 43.8 ± 15.5 years). The Wechsler Memory Scale-Revised (WMS-R) was administered to all participants to assess memory performance. Genotyping was performed for 6 selected tagging SNPs of PAH (rs1722387, rs3817446, rs1718301, rs2037639, rs10860936 and rs11111419).

Results

Analyses of covariance controlling for sex and education years, indicated a significant association between a SNP (rs2037639) and age-corrected verbal memory index of WMS-R (nominal p = 0.0013) which remained significant after correction for multiple testing ( p = 0.0013 < 0.0017 = 0.05/30tests). Individuals with the GG genotype showed a significantly lower mean verbal memory score, compared with those individuals carrying the AA/AG genotype (106.0 ± 16.0 vs. 111.7 ± 13.4; p = 0.00099). A haplotype block containing two markers of rs2037639 and rs10860936 was associated with verbal memory index (permutation global p = 0.0091).

Conclusions

Our findings suggest that common genetic variations in PAH are associated with verbal memory in healthy adults. Unknown functional polymorphisms in PAH or those in other genes nearby might affect memory performance.

Keywords:
Genetic polymorphism; Phenylalanine hydroxylase; Verbal memory; Wechsler Memory Scale-Revised (WMS-R); Association study