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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Cross-examining candidate genes implicated in multiple system atrophy.

Jared S Katzeff1, Katherine Phan1, Sivaraman Purushothuman1

  • 1Brain and Mind Centre & Central Clinical School, The University of Sydney, Sydney, NSW, Australia.

Acta Neuropathologica Communications
|July 26, 2019
PubMed
Summary
This summary is machine-generated.

Multiple system atrophy (MSA), an α-synucleinopathy, presents overlapping symptoms with Parkinson's disease. This review examines potential genetic susceptibility factors and pathomechanisms in MSA, highlighting research gaps and future directions.

Keywords:
COQ2GWASMultiple system atrophyParkinson’s diseaseSusceptibility genesα-Synuclein

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Area of Science:

  • Neurodegenerative diseases
  • Genetics of neurodegeneration
  • α-synucleinopathies

Background:

  • Multiple system atrophy (MSA) is a neurodegenerative disorder with parkinsonism, ataxia, and autonomic failure.
  • Early MSA symptoms can mimic Parkinson's disease (PD), complicating diagnosis.
  • The pathological hallmark of MSA is α-synuclein aggregates in glial cytoplasmic inclusions (GCI).

Purpose of the Study:

  • To review and analyze genetic susceptibility factors and pathomechanisms in MSA.
  • To investigate the roles of specific genes (SNCA, COQ2, MAPT, GBA1, LRRK2, C9orf72) in MSA pathogenesis.
  • To identify under-explored areas and suggest future research directions in MSA genetics.

Main Methods:

  • Literature review and evidence synthesis.
  • Cross-examination of existing data on genetic variants and MSA.
  • Analysis of studies focusing on genetic pathomechanisms.

Main Results:

  • MSA is largely considered sporadic, but rare genetic variants may increase susceptibility.
  • Evidence for specific susceptibility genes (e.g., COQ2) is emerging, but consensus is lacking.
  • Geographical and ethnic variations influence findings, and many studies lack pathological verification.

Conclusions:

  • Further research is needed to establish definitive genetic susceptibility factors for MSA.
  • Standardized diagnostic criteria and pathological verification are crucial for genetic studies.
  • Understanding MSA genetics is vital for developing targeted therapies.