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Phenotypic resemblance in birth weight between first cousins
1Department of Genetics, School of Medicine, University of Hawaii, Honolulu 96822.
Annals of Human Genetics
|January 1, 1986
Summary
Maternal influences significantly impact birth weight in humans, outweighing genetic factors. This study analyzed birth weight correlations among first cousins in Hawaii, revealing non-hereditary maternal effects are primary determinants.
Area of Science:
- Human genetics
- Reproductive biology
- Anthropology
Background:
- Birth weight is a critical indicator of infant health and development.
- Understanding the determinants of birth weight, including genetic and environmental factors, is crucial for public health.
Purpose of the Study:
- To investigate the relative contributions of genetic and non-hereditary maternal influences on human birth weight.
- To quantify phenotypic resemblance in birth weight among single first cousins.
Main Methods:
- Utilized computerized record linkage of birth and marriage data in Hawaii (1942-1979).
- Analyzed 72,078 liveborn singletons across 5,981 paternal and 7,036 maternal first cousin kinships.
- Estimated phenotypic resemblance using covariance and intraclass correlation, considering both inbreeding and outbreeding within racial groups.
Main Results:
- Covariances between maternal cousins were substantially higher than between paternal cousins.
- Neither maternal nor newborn genotype heterogeneity significantly affected first-cousin resemblance.
- Observed paternal cousin correlation was partly explained by mate selection and maternal characteristics.
Conclusions:
- Non-hereditary maternal influences are the primary determinants of human birth weight.
- Environmental and maternal factors play a more significant role than genetics in shaping birth weight.
- Further research into maternal effects is warranted to understand birth weight variations.