The correlation of fecundability among twins: Evidence of a genetic effect on fertility?

K. Christensen, H.P. Kohler, O. Basso, J. Olsen, J.W. Vaupel, J.L. Rodgers

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

BACKGROUND:
Numerous rare genetic conditions are known to influence fecundability in both males and females. It is less clear to what extent more subtle genetic differences influence fecundability on a population level.

METHODS:
In 1994 a population-based survey was conducted among Danish twins born 1953-1982. Fecundability was assessed as the waiting time to pregnancy at the first attempt to achieve a pregnancy.

RESULTS:
The reported time to pregnancy for males was slightly shorter than for females but there were no sex differences in intrapair similarity. We found an intrapair correlation in time to pregnancy for 645 monozygotic twin pairs (r = 0.22; 95% confidence interval = 0.12 to 0.32), but no intrapair correlation for 826 like-sex dizygotic twin pairs (r = 0.00; 95% confidence interval = -0.09 to 0.10).

CONCLUSIONS:
The correlation in time to pregnancy for monozygotic twins suggests genetic factors, although similarities in reporting behaviors could also be contributing to the correlation. The lack of correlation in time to pregnancy for dizygotic twins indicates that possible genetic factors of importance for fecundabililty are acting nonadditively. Hence, it may prove difficult to identify specific gene variants that influence fecundability on a population level if their effects depend on gene-gene interactions.
OriginalsprogEngelsk
TidsskriftEpidemiology
Vol/bind14
Udgave nummer1
Sider (fra-til)60-64
ISSN1044-3983
DOI
StatusUdgivet - 2003

Fingeraftryk

Dizygotic Twins
Monozygotic Twins
Confidence Intervals
Population
Sex Characteristics
Surveys and Questionnaires

Citer dette

Christensen, K. ; Kohler, H.P. ; Basso, O. ; Olsen, J. ; Vaupel, J.W. ; Rodgers, J.L. / The correlation of fecundability among twins : Evidence of a genetic effect on fertility?. I: Epidemiology. 2003 ; Bind 14, Nr. 1. s. 60-64.
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title = "The correlation of fecundability among twins: Evidence of a genetic effect on fertility?",
abstract = "BACKGROUND:Numerous rare genetic conditions are known to influence fecundability in both males and females. It is less clear to what extent more subtle genetic differences influence fecundability on a population level.METHODS:In 1994 a population-based survey was conducted among Danish twins born 1953-1982. Fecundability was assessed as the waiting time to pregnancy at the first attempt to achieve a pregnancy.RESULTS:The reported time to pregnancy for males was slightly shorter than for females but there were no sex differences in intrapair similarity. We found an intrapair correlation in time to pregnancy for 645 monozygotic twin pairs (r = 0.22; 95{\%} confidence interval = 0.12 to 0.32), but no intrapair correlation for 826 like-sex dizygotic twin pairs (r = 0.00; 95{\%} confidence interval = -0.09 to 0.10).CONCLUSIONS:The correlation in time to pregnancy for monozygotic twins suggests genetic factors, although similarities in reporting behaviors could also be contributing to the correlation. The lack of correlation in time to pregnancy for dizygotic twins indicates that possible genetic factors of importance for fecundabililty are acting nonadditively. Hence, it may prove difficult to identify specific gene variants that influence fecundability on a population level if their effects depend on gene-gene interactions.",
author = "K. Christensen and H.P. Kohler and O. Basso and J. Olsen and J.W. Vaupel and J.L. Rodgers",
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The correlation of fecundability among twins : Evidence of a genetic effect on fertility? / Christensen, K.; Kohler, H.P.; Basso, O.; Olsen, J.; Vaupel, J.W.; Rodgers, J.L.

I: Epidemiology, Bind 14, Nr. 1, 2003, s. 60-64.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - The correlation of fecundability among twins

T2 - Evidence of a genetic effect on fertility?

AU - Christensen, K.

AU - Kohler, H.P.

AU - Basso, O.

AU - Olsen, J.

AU - Vaupel, J.W.

AU - Rodgers, J.L.

PY - 2003

Y1 - 2003

N2 - BACKGROUND:Numerous rare genetic conditions are known to influence fecundability in both males and females. It is less clear to what extent more subtle genetic differences influence fecundability on a population level.METHODS:In 1994 a population-based survey was conducted among Danish twins born 1953-1982. Fecundability was assessed as the waiting time to pregnancy at the first attempt to achieve a pregnancy.RESULTS:The reported time to pregnancy for males was slightly shorter than for females but there were no sex differences in intrapair similarity. We found an intrapair correlation in time to pregnancy for 645 monozygotic twin pairs (r = 0.22; 95% confidence interval = 0.12 to 0.32), but no intrapair correlation for 826 like-sex dizygotic twin pairs (r = 0.00; 95% confidence interval = -0.09 to 0.10).CONCLUSIONS:The correlation in time to pregnancy for monozygotic twins suggests genetic factors, although similarities in reporting behaviors could also be contributing to the correlation. The lack of correlation in time to pregnancy for dizygotic twins indicates that possible genetic factors of importance for fecundabililty are acting nonadditively. Hence, it may prove difficult to identify specific gene variants that influence fecundability on a population level if their effects depend on gene-gene interactions.

AB - BACKGROUND:Numerous rare genetic conditions are known to influence fecundability in both males and females. It is less clear to what extent more subtle genetic differences influence fecundability on a population level.METHODS:In 1994 a population-based survey was conducted among Danish twins born 1953-1982. Fecundability was assessed as the waiting time to pregnancy at the first attempt to achieve a pregnancy.RESULTS:The reported time to pregnancy for males was slightly shorter than for females but there were no sex differences in intrapair similarity. We found an intrapair correlation in time to pregnancy for 645 monozygotic twin pairs (r = 0.22; 95% confidence interval = 0.12 to 0.32), but no intrapair correlation for 826 like-sex dizygotic twin pairs (r = 0.00; 95% confidence interval = -0.09 to 0.10).CONCLUSIONS:The correlation in time to pregnancy for monozygotic twins suggests genetic factors, although similarities in reporting behaviors could also be contributing to the correlation. The lack of correlation in time to pregnancy for dizygotic twins indicates that possible genetic factors of importance for fecundabililty are acting nonadditively. Hence, it may prove difficult to identify specific gene variants that influence fecundability on a population level if their effects depend on gene-gene interactions.

U2 - 10.1097/00001648-200301000-00015

DO - 10.1097/00001648-200301000-00015

M3 - Journal article

VL - 14

SP - 60

EP - 64

JO - Epidemiology

JF - Epidemiology

SN - 1044-3983

IS - 1

ER -