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Is umbilical coiling genetically determined?

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Umbilical cord coiling patterns are not influenced by genetic factors in twins. This study found no significant differences in coiling based on chorionicity or zygosity, challenging previous assumptions about the etiology of cord coiling.

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Area of Science:

  • Perinatal Medicine
  • Reproductive Biology
  • Genetics

Background:

  • Abnormal umbilical cord coiling is linked to adverse perinatal outcomes.
  • The underlying causes of umbilical cord coiling patterns remain unclear.
  • Understanding coiling etiology is crucial for improving pregnancy outcomes.

Purpose of the Study:

  • To investigate the potential genetic basis of umbilical cord coiling patterns.
  • To compare umbilical coiling index (UCI) and coiling characteristics between different twin gestations.
  • To determine if chorionicity or zygosity influences cord coiling.

Main Methods:

  • Retrospective cohort study of twin deliveries (>20 weeks gestation).
  • Umbilical coiling index (UCI) and cord insertion site analyzed.
  • Coiling direction and pattern compared by chorionicity and zygosity.

Main Results:

  • No significant differences in UCI or coiling category concordance were found between monochorionic and dichorionic twins.
  • Similarly, no differences were observed between dizygous and monozygous gestations.
  • Analyses of coiling direction and pattern also showed no variation based on chorionicity or zygosity.

Conclusions:

  • The study's findings do not support a genetic etiology for umbilical cord coiling.
  • Environmental or other non-genetic factors likely play a role in determining cord coiling patterns.
  • Further research is needed to elucidate the multifactorial causes of umbilical cord coiling.