A ghrelin gene variant may predict crossover rate from restricting-type anorexia nervosa to other phenotypes of eating disorders: a retrospective survival analysis.
BACKGROUND
Patients with anorexia nervosa restricting type (AN-R) often develop bulimic symptoms and crossover to AN-binge eating/purging type (AN-BP), or to bulimia nervosa (BN). We have reported earlier that genetic variants of an orexigenic peptide ghrelin are associated with BN. Here, the relationship between a ghrelin gene variant and the rate of change from AN-R to other phenotypes of eating disorders (EDs) was investigated.


METHODS
Participants were 165 patients with ED, initially diagnosed as AN-R. The dates of their AN-R onset and changes in diagnosis to other subtypes of ED were investigated retrospectively. Ghrelin gene 3056 T-->C SNP (single nucleotide polymorphism) was genotyped. Probability and hazard ratios were analyzed using life table analysis and Cox's proportional hazard regression model, in which the starting point was the time of AN-R onset and the outcome events were the time of (i) onset of binge eating, that is, when patients changed to binge eating AN and BN and (ii) recovery of normal weight, that is, when patients changed to BN or remission.


RESULTS
Patients with the TT genotype at 3056 T-->C had a higher probability and hazard ratio for recovery of normal weight. The ghrelin SNP was not related with the onset of binge eating.


CONCLUSIONS
The 3056 T-->C SNP of the ghrelin gene is related to the probability and the rate of recovery of normal body weight from restricting-type AN.
Ando
Tetsuya
T
Department of Psychosomatic Research, National Institute of Mental Health, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan. ando-t@ncnp.go.jp
Komaki
Gen
G
Nishimura
Hiroki
H
Naruo
Tetsuro
T
Okabe
Kenjiro
K
Kawai
Keisuke
K
Takii
Masato
M
Oka
Takakazu
T
Kodama
Naoki
N
Nakamoto
Chiemi
C
Ishikawa
Toshio
T
Suzuki-Hotta
Mari
M
Minatozaki
Kazunori
K
Yamaguchi
Chikara
C
Nishizono-Maher
Aya
A
Kono
Masaki
M
Kajiwara
Sohei
S
Suematsu
Hiroyuki
H
Tomita
Yuichiro
Y
Ebana
Shoichi
S
Okamoto
Yuri
Y
Nagata
Katsutaro
K
Nakai
Yoshikatsu
Y
Koide
Masanori
M
Kobayashi
Nobuyuki
N
Kurokawa
Nobuo
N
Nagata
Toshihiko
T
Kiriike
Nobuo
N
Takenaka
Yoshito
Y
Nagamine
Kiyohide
K
Ookuma
Kazuyoshi
K
Murata
Shiho
S
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000856:Anorexia Nervosa / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics*; D056912:Binge-Eating Disorder / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D015992:Body Mass Index; D002032:Bulimia / Q000235:genetics; D052018:Bulimia Nervosa / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D002648:Child; D005260:Female; D005838:Genotype; D054439:Ghrelin / Q000235:genetics*; D006801:Humans; D056865:Ideal Body Weight / Q000235:genetics; D007564:Japan / Q000453:epidemiology; D008875:Middle Aged; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011379:Prognosis; D012189:Retrospective Studies; D016019:Survival Analysis; D013997:Time Factors; D055815:Young Adult
D054439:Ghrelin