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Lethal Alleles02:41

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Related Experiment Video

Updated: Apr 12, 2026

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Krüppel-like factor 1: hematologic phenotypes associated with KLF1 gene mutations.

J S Waye1,2, B Eng1

  • 1Hamilton Regional Laboratory Medicine Program, Hamilton Health Sciences, Hamilton, Ontario, L8N 3Z5, Canada.

International Journal of Laboratory Hematology
|May 16, 2015
PubMed
Summary
This summary is machine-generated.

Krüppel-like factor 1 (KLF1) is vital for red blood cell development. KLF1 gene mutations cause various anemias, highlighting the importance of KLF1 gene testing in diagnosing hematologic disorders.

Keywords:
KLF1 genegenotype-phenotype relationshipmutations

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Area of Science:

  • Hematology
  • Molecular Biology
  • Genetics

Background:

  • Krüppel-like factor 1 (KLF1) is a key transcription factor regulating erythropoiesis.
  • KLF1 mutations are linked to significant hematologic conditions, including congenital dyserythropoietic anemia type IV (CDAN4) and transfusion-dependent hemolytic anemia.
  • KLF1 haploinsufficiency can result in benign hematologic variations.

Purpose of the Study:

  • To review the intricate genotype-phenotype correlations observed in KLF1 mutations.
  • To evaluate the diagnostic value of KLF1 gene testing in clinical hematology.

Main Methods:

  • Literature review focusing on KLF1 mutations and associated phenotypes.
  • Analysis of genotype-phenotype data from published cases and databases.
  • Discussion of the clinical utility and interpretation of KLF1 gene testing.

Main Results:

  • KLF1 mutations exhibit diverse clinical manifestations, ranging from severe anemia to milder hematologic conditions.
  • Specific mutations, such as the dominant-negative missense mutation (c.973G>A, p.Glu325Lys), cause distinct phenotypes like CDAN4.
  • Loss-of-function mutations in compound heterozygotes lead to transfusion-dependent hemolytic anemia.

Conclusions:

  • The genotype-phenotype relationship in KLF1 mutations is complex and clinically significant.
  • KLF1 gene testing is a valuable tool for diagnosing and understanding a spectrum of hematologic disorders.
  • Further research into KLF1 function can improve the management of KLF1-related anemias.