title: Cystathionine β-synthase deficiency causes infertility by impairing decidualization and gene expression networks in uterus implantation sites.
abstract: Hyperhomocysteinemia has been reported in human reproduction as a risk factor for early pregnancy loss, preeclampsia, and congenital birth defects like spina bifida. Female infertility was also observed in cystathionine beta synthase-deficient mice (Cbs-KO) as an animal model for severe hyperhomocysteinemia. The aim for the present research was to elucidate the time-point of pregnancy loss and to pinpoint gene and cellular changes involved in the underlying pathological mechanism. By mating 90-day-old wild-type and Cbs-KO female mice with their homologous male partners, we found that pregnancy loss in Cbs-KO occurred between the 8th and 12th gestation day during placenta formation. DNA microarrays were carried out on uterus from implantation and interimplantation samples obtained on day 8. The results allowed us to select genes potentially involved in embryo death; these were individually confirmed by RT-qPCR, and their expressions were also followed throughout pregnancy. We found that changes in expression of Calb1, Ttr, Expi, Inmt, Spink3, Rpgrip1, Krt15, Mt-4, Gzmc, Gzmb, Tdo2, and Afp were important for pregnancy success, since a different regulation in Cbs-KO mice was found. Also, differences in relationships among selected genes were observed, indicating a dysregulation of these genes in Cbs-KO females. In conclusion, our data provide more information on the gene expression cascade and its timely regulated process required for a successful pregnancy. In addition, we unveil new potential avenues to explore further investigations in pregnancy loss.
authors.affiliation: Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Veterinaria, Instituto de Investigación Sanitaria de Aragón, Universidad de Zaragoza, Zaragoza, Spain.
authors.forename: Mario
authors.initials: M
authors.lastname: Nuño-Ayala
authors.forename: Natalia
authors.initials: N
authors.lastname: Guillén
authors.forename: Carmen
authors.initials: C
authors.lastname: Arnal
authors.forename: José M
authors.initials: JM
authors.lastname: Lou-Bonafonte
authors.forename: Alba
authors.initials: A
authors.lastname: de Martino
authors.forename: Jose-Antonio
authors.initials: JA
authors.lastname: García-de-Jalón
authors.forename: Sonia
authors.initials: S
authors.lastname: Gascón
authors.forename: Lourdes
authors.initials: L
authors.lastname: Osaba
authors.forename: Jesús
authors.initials: J
authors.lastname: Osada
authors.forename: María-Angeles
authors.initials: MA
authors.lastname: Navarro
mesh_terms: D000022:Abortion, Spontaneous / Q000503:physiopathology*; D000704:Analysis of Variance; D000818:Animals; D003541:Cystathionine beta-Synthase / Q000172:deficiency* / Q000235:genetics; D003656:Decidua / Q000502:physiology; D010064:Embryo Implantation / Q000502:physiology; D005260:Female; D018507:Gene Expression Regulation, Developmental / Q000502:physiology*; D053263:Gene Regulatory Networks / Q000502:physiology; D020138:Hyperhomocysteinemia / Q000503:physiopathology*; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007247:Infertility, Female / Q000201:enzymology* / Q000503:physiopathology; D051379:Mice; D018345:Mice, Knockout; D020411:Oligonucleotide Array Sequence Analysis; D011247:Pregnancy; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018709:Statistics, Nonparametric; D014599:Uterus / Q000378:metabolism*
chemical_list: D003541:Cystathionine beta-Synthase