Knafo A, Jaffee SR. (2013):
Gene-environment correlation in developmental psychopathology.
Dev Psychopathol. 2013 Feb;25(1):1-6.
Lifford, K.J., Harold, G.T. and Thapar, A. (2007):
Parent-child relationships and ADHD symptoms: a longitudinal analysis.
J Abnorm Child Psychol 36(2):285-296.
Lucock, M. (2000):
Folic acid: nutritional biochemistry, molecular biology and role in disease processes.
Mol Genet Metab.; 71:121–138.
Molloy, A.M., Daly, S. and Mills, J.L. (1997):
Thermolabile variant of 5,10- methylene tetrahydrofolate reductase associated with low red-cell folates: implications for folate intake recommendations.
Lancet 349:1591–1593.
Lynch, B. (2013):
Gilbody, S., Lewis, S. and Lightfoot, T. (2007):
Methylenetetrahydrofolate reductase (MTHFR) genetic polymorphisms and psychiatric disorders: a HuGE review.
Am J Epidemiol 165(1):1-13.
Goyette, P., Sumner, J.S., Milos, R., Duncan, A.M., Rosenblatt, D.S., Matthews, R.G. and Rozen, R. (1994):
Human ethylenetetra-hydrofolate reductase: isolation of CDNA, mapping and mutation identification.
Nat Genet 7(2):195-200.
Gokcon, C., Kocak, N. and Pekgor, A. (2011):
Methylene tetrahydrofolate reductase gene polymorphism in children with attention deficient hyperactivity disorder.
Int J Med Sci 8:523-528.
9. Moretti, P., Peters, S.U., Del Gaudio, D., Sahoo, T., Hyland, K., Bottiglieri, T., Hopkin, R.J., Peach, E., Min, S.H., Goldman, D., Roa, B., Bacino, C.A., Scaqlia., F. (2008):
Brief report: autistic symptoms, developmental regression, mental retardation, epilepsy, and dyskinesias in CNS folate deficiency.
J Autism Dev Disord., 38:1170-1177.
Novik, T.S., Hervas, A., Ralston, S.J., Dalsgaard, S., Rodrigues-Pereira, R. and Lorenzo, M.J. (2006):
Influence of gender on attention deficit hyperactivity disorder in Europa-ADORE.
Eur Child Adolesc Psychiatry 15(1):I15-I24.
Aboul-ata, M. and Amin, F. (2015):
The Prevalence of ADHD in Fayoum City (Egypt) Among School-Age Children: Depending on a DSM-5-Based Rating Scale.
J Atten Disord 22(2):127-133.
Farahat, T., Alkot, M., Rajab, A. and Anbar, R. (2014):
Attention deficit hyperactivity disorder among primary school children in Menoufia governorate, Egypt.
International Journal of Family Medicine 2014: 1-7.
Cheon, K.A., Kim, B.N. and Cho, S.C. (2007):
Association of 4-Repeat Allele of the Dopamine D4 Receptor Gene Exon III Polymorphism and Response to Methylphenidate Treatment in Korean ADHD Children.
Neuropsychopharmacol 32:1377–1383.
Nafi, O.A. and Shaheen, A.M. (2011):
Prevalence of Attention Deficit Hyperactive Disorder (ADHD) in School Children in Al-Qaser District Jordan.
Jordan Med J 45(1):37-43.
Von Gontard, A. and Equit, M. (2014):
Comorbidity of ADHD and incontinence in children.
Eur Child Adoles Psy 24(2):127-140.
Faraone, S.V., Perlis, R.H., Doyle, A.E., Smoller, J.W., Coralinick, J.J., Holmgren, M.A. and Sklar, P. (2005):
Molecular genetics of attention deficit/hyperactivity disorder.
Biological Psychiatry; 57:1313–1323.
Krull, K.R., Brouwers, P., Jain, N., Zhang, L., Bomgaars, L., Dreyer, Z., Mahoney, D., Bottomley, S. and Okcu, M.F. (2008):
Folate pathway genetic polymorphisms are related to attention disorders in childhood leukemia survivors.
J Pediatr,152(1):101-105.
Table 1: Descriptive data of ADHD and control groups.
Variable
|
ADHD
|
Control
|
P value
|
Age
|
8.147±1.75
|
9.04±2.02
|
0.073
|
Gender
|
|
|
|
Male
|
26 (43%)
|
21 (35%)
|
0.21
|
Female
|
4 (7%)
|
9 (15%)
|
Family History
|
|
|
|
Normal
|
19 (31.67%)
|
27 (45%)
|
0.0248
|
Medical Illness
|
6 (10.00%)
|
3 (5%)
|
Psychiatric Illness
|
5 (8.33%)
|
0 (0.00%)
|
Consanguinity
|
|
|
|
Non-cognate
|
25 (41,67%)
|
26 (43.33%)
|
0.838
|
First Degree
|
2 (3.33%)
|
1 (1.67%)
|
Second Degree
|
3 (5%)
|
3 (5%)
|
Table 2: MTHFR geneC667T allele of ADHD and control groups.
Gene Allele
|
ADHD
|
Control
|
P value
|
C677T
|
CC
|
16 (27%)
|
6 (10%)
|
*0.0159
|
CT
|
14 (23%)
|
24 (40%)
|
TT
|
0 (0%)
|
0 (0%)
|
*statistically significant