Brief report: parental age and the sex ratio in autism. 2009

Alene Anello, and Abraham Reichenberg, and Xiaodong Luo, and James Schmeidler, and Eric Hollander, and Christopher J Smith, and Connor M Puleo, and Lauren A Kryzak, and Jeremy M Silverman
Harvard University, Cambridge, MA, USA.

The male-to-female (M:F) ratio for autism spectrum disorders (ASD), typically about 4:1, appears to decrease with increasing paternal age, but this relationship has not been systematically tested. With 393 ASD cases from families with two or more ASD cases, we categorized paternal age into five age groups (<30, 30-34, 35-39, 40-44, 45+) and found that the M:F ratio was significantly decreased with increasing paternal age groups and remained so after also adjusting for maternal age. No significant relationship between maternal age group and the M:F ratio was observed. This study suggests that the M:F ratio is reduced with increasing paternal age consistent with de novo genetic or genomic anomalies arising more frequently as men age and then conceive children.

UI MeSH Term Description Entries
D008297 Male Males
D008423 Maternal Age The age of the mother in PREGNANCY. Age, Maternal,Ages, Maternal,Maternal Ages
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010290 Parents Persons functioning as natural, adoptive, or substitute parents. The heading includes the concept of parenthood as well as preparation for becoming a parent. Step-Parents,Parental Age,Parenthood Status,Stepparent,Age, Parental,Ages, Parental,Parent,Parental Ages,Status, Parenthood,Step Parents,Step-Parent,Stepparents
D010331 Paternal Age Age of the biological father. Age, Paternal,Ages, Paternal,Paternal Ages
D002648 Child A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL. Children
D002659 Child Development Disorders, Pervasive Severe distortions in the development of many basic psychological functions that are not normal for any stage in development. These distortions are manifested in sustained social impairment, speech abnormalities, and peculiar motor movements. Pervasive Child Development Disorders,Pervasive Development Disorders
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults

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