Meiotic Prophase Failure Module

Module meiotic_prophase_failure 7 disorders Pathograph 7

A conserved mechanism module for inherited gametogenic failure caused by disruption of meiotic prophase I chromosome synapsis and recombination. In affected germ cells, programmed meiotic chromosome events fail at homolog pairing, synaptonemal complex assembly, homologous-recombination repair of DNA double-strand breaks, or pachytene checkpoint resolution. The shared path is meiotic arrest with germ-cell apoptosis, producing sex-dimorphic clinical outcomes: ovarian follicle depletion and primary ovarian insufficiency in 46,XX individuals, and spermatogenic arrest with non-obstructive azoospermia or Sertoli-cell-only syndrome in 46,XY individuals. This module is intended for meiotic genes such as SYCE1, MCM8, MCM9, STAG3, HFM1, MSH4, MSH5, DMC1, and SYCP3. It intentionally excludes upstream gonadal organogenesis and steroidogenic transcription-factor disorders such as NR5A1, WT1, SOX9, SRY, FOXL2, and DHH.

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Pathophysiology Nodes

7 shared nodes are defined in this module.

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Cell Types

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Biological Processes

meiotic cell cycle GO:0051321 homologous chromosome pairing at meiosis GO:0007129 synaptonemal complex assembly GO:0007130 DECREASED double-strand break repair via homologous recombination GO:0000724 DECREASED DNA double-strand break processing GO:0000729 DECREASED meiotic recombination checkpoint signaling GO:0051598 INCREASED apoptotic process GO:0006915 INCREASED female gamete generation GO:0007292 DECREASED male gamete generation GO:0048232 DECREASED

Notes

This is a mechanism module, not a specific disease. Disorder entries should reference individual nodes via conforms_to using "meiotic_prophase_failure#<Node Name>". The module defines a provisional research scaffold for genes that disrupt meiotic prophase after gonadal organogenesis has occurred. Somatic DNA-repair and cancer-predisposition branches are gene-specific, especially for MCM8 and MCM9, and should not be required for every conforming disorder.

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Used By Disorder Entries

HFM1-related gametogenic failure via Impaired crossover formation at meiotic recombination intermediates → Homologous Recombination Repair of Meiotic DNA Breaks , Meiotic arrest and germ cell depletion → Pachytene Checkpoint Arrest and Germ Cell Apoptosis , Ovarian follicle depletion and primary ovarian insufficiency → Ovarian Follicle Depletion and Primary Ovarian Insufficiency , Spermatogenic arrest and non-obstructive azoospermia → Spermatogenic Arrest and Non-Obstructive Azoospermia

HROB-related gametogenic failure via Impaired homologous recombination → Homologous Recombination Repair of Meiotic DNA Breaks , Prophase I meiotic arrest and germ cell depletion → Pachytene Checkpoint Arrest and Germ Cell Apoptosis , Ovarian follicle depletion and primary ovarian insufficiency → Ovarian Follicle Depletion and Primary Ovarian Insufficiency , Spermatogenic arrest (predicted male branch) → Spermatogenic Arrest and Non-Obstructive Azoospermia

MCM8-related gametogenic failure via Impaired homologous recombination → Homologous Recombination Repair of Meiotic DNA Breaks , Meiotic arrest and germ cell depletion → Pachytene Checkpoint Arrest and Germ Cell Apoptosis , Ovarian follicle depletion and primary ovarian insufficiency → Ovarian Follicle Depletion and Primary Ovarian Insufficiency , Spermatogenic arrest and non-obstructive azoospermia → Spermatogenic Arrest and Non-Obstructive Azoospermia , Somatic genome instability and germ cell tumor predisposition → Somatic DNA Repair Deficiency and Cancer Predisposition

MCM9-related gametogenic failure via Impaired homologous recombination → Homologous Recombination Repair of Meiotic DNA Breaks , Somatic genome instability with polyposis and cancer predisposition → Somatic DNA Repair Deficiency and Cancer Predisposition

STAG3-related gametogenic failure via Meiotic cohesin instability and synaptonemal complex disruption → Synaptonemal Complex Assembly , Prophase I meiotic arrest and germ cell apoptosis → Pachytene Checkpoint Arrest and Germ Cell Apoptosis , Ovarian follicle depletion and primary ovarian insufficiency → Ovarian Follicle Depletion and Primary Ovarian Insufficiency , Spermatogenic arrest and non-obstructive azoospermia → Spermatogenic Arrest and Non-Obstructive Azoospermia

SYCE1-related gametogenic failure via Synaptonemal complex assembly failure → Synaptonemal Complex Assembly , Meiotic prophase I pachytene checkpoint activation → Pachytene Checkpoint Arrest and Germ Cell Apoptosis

SYCP3-related spermatogenic failure via Synaptonemal complex axial/lateral element assembly failure → Synaptonemal Complex Assembly , Pachytene-stage meiotic arrest and germ-cell apoptosis → Pachytene Checkpoint Arrest and Germ Cell Apoptosis , Non-obstructive azoospermia → Spermatogenic Arrest and Non-Obstructive Azoospermia

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Pathograph

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Pathophysiology

Meiotic Prophase I Entry and Homolog Pairing

trigger

Germ cells enter the meiotic cell cycle and initiate prophase I chromosome pairing. This node captures the shared upstream context for module genes: the gonad is present, germ cells enter meiosis, and homologous chromosomes must pair before synapsis and recombination can be completed.

germ cell CL:0000586

meiotic cell cycle GO:0051321 homologous chromosome pairing at meiosis GO:0007129

Downstream

Synaptonemal Complex Assembly
Homologous Recombination Repair of Meiotic DNA Breaks

Synaptonemal Complex Assembly

central effector

Synaptonemal complex components assemble between paired homologous chromosomes during meiotic prophase I. Disruption of central or lateral element proteins such as SYCE1 or SYCP3 produces asynapsis or unstable synapsis, preventing normal progression through pachytene.

germ cell CL:0000586

synaptonemal complex assembly GO:0007130 DECREASED

Used by disorders

STAG3-related gametogenic failure as Meiotic cohesin instability and synaptonemal complex disruption

SYCE1-related gametogenic failure as Synaptonemal complex assembly failure

SYCP3-related spermatogenic failure as Synaptonemal complex axial/lateral element assembly failure

Downstream

Pachytene Checkpoint Arrest and Germ Cell Apoptosis

Homologous Recombination Repair of Meiotic DNA Breaks

central effector

Programmed and repair-associated DNA breaks in meiotic prophase require homologous-recombination machinery to complete chromosome pairing, crossover formation, and genome integrity surveillance. Disruption of repair factors such as MCM8, MCM9, DMC1, HFM1, MSH4, or MSH5 leaves meiotic DNA damage unresolved and blocks normal pachytene progression.

germ cell CL:0000586

double-strand break repair via homologous recombination GO:0000724 DECREASED DNA double-strand break processing GO:0000729 DECREASED

Used by disorders

HFM1-related gametogenic failure as Impaired crossover formation at meiotic recombination intermediates

HROB-related gametogenic failure as Impaired homologous recombination

MCM8-related gametogenic failure as Impaired homologous recombination

MCM9-related gametogenic failure as Impaired homologous recombination

Downstream

Pachytene Checkpoint Arrest and Germ Cell Apoptosis
Somatic DNA Repair Deficiency and Cancer Predisposition

Pachytene Checkpoint Arrest and Germ Cell Apoptosis

consequence

Failed synapsis or unresolved meiotic recombination activates pachytene checkpoint signaling. Instead of completing meiotic prophase and producing functional gametes, affected germ cells arrest and are eliminated by apoptosis.

germ cell CL:0000586

meiotic recombination checkpoint signaling GO:0051598 INCREASED apoptotic process GO:0006915 INCREASED

Used by disorders

HFM1-related gametogenic failure as Meiotic arrest and germ cell depletion

HROB-related gametogenic failure as Prophase I meiotic arrest and germ cell depletion

MCM8-related gametogenic failure as Meiotic arrest and germ cell depletion

STAG3-related gametogenic failure as Prophase I meiotic arrest and germ cell apoptosis

SYCE1-related gametogenic failure as Meiotic prophase I pachytene checkpoint activation

SYCP3-related spermatogenic failure as Pachytene-stage meiotic arrest and germ-cell apoptosis

Downstream

Ovarian Follicle Depletion and Primary Ovarian Insufficiency
Spermatogenic Arrest and Non-Obstructive Azoospermia

Ovarian Follicle Depletion and Primary Ovarian Insufficiency

consequence

In 46,XX individuals, loss of oocytes during fetal or early postnatal meiotic progression depletes the ovarian follicle pool. The clinical manifestation is primary ovarian insufficiency, ovarian dysgenesis, primary amenorrhea, or hypergonadotropic hypogonadism depending on ascertainment and residual ovarian reserve.

oocyte CL:0000023

female gamete generation GO:0007292 DECREASED

Used by disorders

HFM1-related gametogenic failure as Ovarian follicle depletion and primary ovarian insufficiency

HROB-related gametogenic failure as Ovarian follicle depletion and primary ovarian insufficiency

MCM8-related gametogenic failure as Ovarian follicle depletion and primary ovarian insufficiency

STAG3-related gametogenic failure as Ovarian follicle depletion and primary ovarian insufficiency

Spermatogenic Arrest and Non-Obstructive Azoospermia

consequence

In 46,XY individuals, meiotic prophase failure in spermatocytes produces spermatogenic arrest, often observed clinically as non-obstructive azoospermia, maturation arrest, or Sertoli-cell-only syndrome after germ cell depletion.

spermatocyte CL:0000017

male gamete generation GO:0048232 DECREASED

Used by disorders

HFM1-related gametogenic failure as Spermatogenic arrest and non-obstructive azoospermia

HROB-related gametogenic failure as Spermatogenic arrest (predicted male branch)

MCM8-related gametogenic failure as Spermatogenic arrest and non-obstructive azoospermia

STAG3-related gametogenic failure as Spermatogenic arrest and non-obstructive azoospermia

SYCP3-related spermatogenic failure as Non-obstructive azoospermia

Somatic DNA Repair Deficiency and Cancer Predisposition

gene specific consequence

A gene-specific branch for module genes that also function in mitotic or somatic DNA repair. MCM8 and MCM9 are the main current examples: biallelic variants may combine meiotic prophase failure with germ-cell tumors or gastrointestinal polyposis and early-onset malignancy. This branch should be used only when gene-specific evidence supports a somatic cancer phenotype.

double-strand break repair via homologous recombination GO:0000724 DECREASED

Used by disorders

MCM8-related gametogenic failure as Somatic genome instability and germ cell tumor predisposition

MCM9-related gametogenic failure as Somatic genome instability with polyposis and cancer predisposition