32 research outputs found
Publisher Correction: A PRDX1 mutant allele causes a MMACHC secondary epimutation in cblC patients
The original version of this Article contained an error in the title, which was incorrectly given as 'APRDX1 mutant allele causes a MMACHC secondary epimutation in cblC patients'. This has now been corrected in both the PDF and HTML versions of the Article to read 'A PRDX1 mutant allele causes a MMACHC secondary epimutation in cblC patients'
Apport de l'autoconservation de sperme dans la prise en charge des oligozoospermies extrĂȘmes (Ă©tude rĂ©trospective Ă propos de 75 patients)
LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Recherche d'anti-corps anti-spermatozoĂŻdes par mĂ©thode directe et indirecte en cytomĂ©trie de flux couplĂ©e Ă l'immunofluorescene (technique et intĂ©rĂȘt pratique)
POITIERS-BU MĂ©decine pharmacie (861942103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Telomere Length, a New Biomarker of Male (in)Fertility? A Systematic Review of the Literature
Male factors are suspected in around half cases of infertility, of which up to 40% are diagnosed as idiopathic. In the context of a continuously increased resort to ART and increased decline of semen parameters, it is of greatest interest to evaluate an additional potential biomarker of sperm quality. According to PRISMA guidelines, this systematic review of the literature selected studies evaluating telomere length in sperm and/or in leukocytes as a potential male fertility biomarker. Twenty-two publications (3168 participants) were included in this review of experimental evidence. For each study, authors determined if there was a correlation between telomere length and semen parameters or fertility outcomes. Of the 13 studies concerning sperm telomere length (STL) and semen parameters, ten found an association between short STL and altered parameters. Concerning the impact of STL on ART results, the data are conflicting. However, eight of the 13 included studies about fertility found significantly longer sperm telomeres in fertile men than in infertile men. In leukocytes, the seven studies reported conflicting findings. Shorter sperm telomeres appear to be associated with altered semen parameters or male infertility. Telomere length may be considered as a new molecular marker of spermatogenesis and sperm quality, and thus is related to male fertility potential. However, additional studies are needed to define the place of the STL in the assessment of individual fertility
L'acrosome : Développement et comparaison entre espÚces, apport d'un cas familial de globozoospermie
L'acrosome spermatique est connu pour
son rÎle dans la fécondation dans la grande majorité des
espÚces animales étudiées. On peut estimer l'apparition de
l'acrosome, contemporaine de l'avÚnement d'une fécondation hors du
milieu aquatique. La composition chimique de l'acrosome ainsi que son mode
d'excrétion pourraient le faire considérer comme un simple lysosome.
Cela serait nier son important rÎle morphogénique dans la
spermiogenÚse. En effet, son développement est étroitement
lié à celui de la manchette et de son systÚme microtubulaire.
Grùce aux récentes données de mutagenÚse animale, la
biogenÚse de l'acrosome dévoile pas à pas ses mécanismes. La
globozoospermie, tératozoospermie humaine rare mais cause
d'infertilitĂ© sĂ©vĂšre, est caractĂ©risĂ©e par des tĂȘtes
spermatiques globuleuses, dépourvues d'acrosome. Elle est l'illustration
d'un défaut de biogenÚse acrosomiale. Récemment, l'étude
génétique d'une famille présentant des frÚres
globozoospermiques et des frĂšres fertiles a permis la mise en
Ă©vidence d'une mutation du gĂšne SPATA16 responsable Ă l'Ă©tat
homozygote du phénotype de globozoospermie. Cette étude ajoute une
protéine à la liste de celles impliquées dans la formation de
l'acrosome humain
Hypogonadotropic hypogonadism in men with hereditary hemochromatosis
RĂ©sumĂ© LâHĂ©mochromatose HĂ©rĂ©ditaire est. une maladie gĂ©nĂ©tique qui Ă©volue en silence. Son diagnostic est. souvent fait tardivement, au stade des complications. MĂȘme si son incidence diminue, lâHypogonadisme Hypogonadotrope (HH) est. lâune des complications classiques de lâHĂ©mochromatose. Ceci est. probablement le rĂ©sultat dâun diagnostic plus prĂ©coce, dâune meilleure information des mĂ©decins. Certains symptĂŽmes en lien avec lâHH, peuvent avoir un impact sur la sexualitĂ© (diminution de la libido, dysfonction Ă©rectile ou troubles de lâĂ©jaculationâŠ) ainsi que sur la reproduction. Cette revue repose sur une recherche online en langue anglaise, française et allemande de publications disponibles sur PubMed/Medline, jusquâau 23 sept. 2016 Ă partir des mots clĂ©s suivants: infertilitĂ© masculine, hypogonadisme hypogonadotrope, HĂ©mochromatose HĂ©rĂ©ditaire. Trente quatre publications ont satisfait aux critĂšres de sĂ©lection. Cet article de revue dĂ©crit lâimpact dâune surcharge en fer sur la fertilitĂ© masculine, notamment via lâHypogonadisme Hypogonadotrope quâelle induit et propose des modalitĂ©s de traitement
Ovarian Telomerase and Female Fertility
International audienceWomenâs fertility is characterized both quantitatively and qualitatively mainly by the pool of ovarian follicles. Monthly, gonadotropins cause an intense multiplication of granulosa cells surrounding the oocyte. This step of follicular development requires a high proliferation ability for these cells. Telomere length plays a crucial role in the mitotic index of human cells. Hence, disrupting telomere homeostasis could directly affect womenâs fertility. Strongly expressed in ovaries, telomerase is the most effective factor to limit telomeric attrition and preserve ovarian reserve. Considering these facts, two situations of infertility could be correlated with the length of telomeres and ovarian telomerase activity: PolyCystic Ovary Syndrome (PCOS), which is associated with a high density of small antral follicles, and Premature Ovarian Failure (POF), which is associated with a premature decrease in ovarian reserve. Several authors have studied this topic, expecting to find long telomeres and strong telomerase activity in PCOS and short telomeres and low telomerase activity in POF patients. Although the results of these studies are contradictory, telomere length and the ovarian telomerase impact in womenâs fertility disorders appear obvious. In this context, our research perspectives aimed to explore the stimulation of ovarian telomerase to limit the decrease in the follicular pool while avoiding an increase in cancer risk