TABLE I.

Allele, Genotype and Haplotype Distribution of Two Deletion Variants in the DDC Gene Among Patients With Infantile Autism

	All patients (n=90)	Danish patients (n=17)	French patients (n=73)
Alleles
1-bp deletion
1-bp del	13	3	10
WT	167	31	136
4-bp deletion
4-bp del	34	4	30
WT	146	30	116
Genotypesa
1-bp deletion
WT/WT	77	14	63
WT/1-bp del	13	3	10
1-bp del/1-bp del	0	0	0
4-bp deletion
WT/WT	58	13	45
WT/4-bp del	30	4	26
4-bp del/4-bp del	2	0	2
Two-locus genotypes
WT WT/WT WT	48	12	36
1-bp del WT/WT WT	10	1	9
WT 4-bp del/WT WT	27	2	25
WT 4-bp del/ WT 4-bp del	2	0	2
WTWT/1-bp del 4-bp del	3	2	1

^aThe alleles or haplotypes in a genotype are separated by / and the 1-bp deletion polymorphism is mentioned first.