Prenatal diagnosis of a fetus with harlequin ichthyosis caused by novel splice-site mutation in ABCA12 gene / 中华围产医学杂志

This article reported a rare case of harlequin ichthyosis which was indicated with multiple structural abnormalities by prenatal ultrasound and diagnosed by trio-based whole-exome sequencing (Trio-WES). Prenatal diagnosis was performed because the ultrasound at 24 +4 gestational weeks revealed the fetus presenting with eclabium, flattened nose, short mandible, small auricle and abnormal posture of the toes. Copy number variation sequencing (CNV-seq) showed no chromosome aneuploidy or pathogenic copy number variants over 100 kb in the fetal or parental samples. Trio-WES showed that the fetus carried two heterozygous mutations, c.2593-1G>A and c.7444C>T in ABCA12. Sanger sequencing confirmed that c.2593-1G>A, a previously unreported variant, was paternally inherited and c.7444C>T was maternally inherited. Both parents had normal phenotype. The fetus was finally diagnosed with harlequin ichthyosis. After prenatal counseling, the parents made an informed choice to terminate the pregnancy at 28 +4 gestational weeks. The stillborn fetus showed multiple malformations The variants in this case expand the spectrum of variants in ABCA12 gene.

An infant with lamellar ichthyosis induced by CYP4F22 gene mutations / 中华皮肤科杂志

A 1-month-old male infant presented with skin flushing covering with collodion-like membrane all over the body at birth, and experienced gradual skin desquamation thereafter. At the age of 2 months, collodion-like membrane completely peeled off, and the patient presented with obvious scales and dry skin. Skin examination showed generalized dry skin, tense, glossy and transparent plastic wrapper-like membrane remaining on the front chest, large and disk-shaped white scales with an adherent center and free edges inlaid in the skin of the trunk and scalp. Genetic testing showed compound heterozygous mutations in the CYP4F22 gene of the patient, including the mutation c.1137G>A (p.W379X) inherited from his father and the mutation c.467G>A (p.R156H) inherited from his mother. The patient was diagnosed with lamellar ichthyosis.

Ictiosis lamelar en una unidad neonatal / Lamellar Ichthyosis: a case study in a neonatal unit

RESUMEN Introducción: en el recién nacido pueden ser evidentes numerosos trastornos hereditarios, que causan afectaciones en la pigmentación, textura, elasticidad e integridad estructural del tegumento. La ictiosis laminar o eritrodermiaictiosiforme congénita es una genodermatosis autosómica recesiva poco frecuente, caracterizada por un cuadro eritrodérmico, queratodermia palmo-plantar, onicosis y otros trastornos. Presentación del caso: recién nacido con ictiosis lamelar, hospitalizado en la unidad de cuidados intensivos neonatal del hospital Ginecobstétrico Fe del Valle Ramos, en el municipio de Manzanillo. El tratamiento se centró en mantener la entereza de la piel mediante humectación y lubricación continua con emolientes, control de la temperatura, nutrición y prevención de infecciones secundarias. Conclusiones: se afirma que la atención multidisciplinaria y la implementación del plan de cuidados, fue esencial para el éxito del tratamiento. Hubo mejora de la piel y mucosas, prevención de infecciones. Se favorecieron las condiciones de supervivencia y autonomía de los padres para los cuidados en domicilio.

ABSTRACT Introduction: in the newborn, numerous hereditary disorders may be evident, which can cause various aberrations of pigmentation, texture, elasticity and structural integrity of the integument. Among these pathologies are ichthyosis, from the Greek ichthys which means fish. Laminar Ichthyosis or Congenital Ichthyosiform Erythroderma (CIE) is a rare autosomal recessive genodermatosis (1/300 000 births worldwide), characterized by an erythrodermic condition, palmoplantar keratoderma (PPK), onicosis, and other disorders. Case report: a newborn with Lamellar Ichthyosis hospitalized in the neonatal intensive care unit at Fe del Valle Ramos Gynecological Obstetric Hospital, in Manzanillo municipality, Granma province. Medical care was based on maintaining the integrity of the skin through moisturizing and continuous lubrication with emollients, temperature control, nutrition and prevention of secondary infections. Conclusions: through the case study, it is stated that the medical appointments with other specialties for the multidisciplinary care and the implementation of the care plan were essential regarding the multidisciplinary success of the treatment. There was improvement of the skin and mucosa, prevention of infections, concluding with favorable conditions of survival and autonomy of the parents for home care.

Cisto ductal de glândula lacrimal em paciente com eritrodermia ictiosiforme congênita / Ductal cyst of lacrimal gland in patient with congenital ichthyosiform erythroderma

Resumo A ictiose lamelar é uma doença congênita de herança autossômica recessiva que se caracteriza clinicamente por descamação de toda a superfície corporal devido hiperceratose mucocutânea que pode levar a comprometimento oftalmológico. Neste estudo relatamos um caso de cisto ductal de glândula lacrimal em paciente portador de ictiose lamelar atendido no Hospital Oftalmológico de Anápolis.

Abstract Lamellar ichthyosis is a congenital disease autosomal recessive which is characterized clinically by peeling of all the body surface due hyperkeratosis mucocutaneous that can cause ocular involvement. We reported a case of ductal cyst of the lacrimal gland in patient with lamellar ichthyosis attended in the Ophthalmological Hospital of Anápolis.

A Nonsense Mutation in Transglutaminase1Gene and Loss of Enzyme Activity in a Family with Lamellar Ichthyosis / 中华皮肤科杂志

Objective To detect the activity of transglutaminase1(TGM1)and gene mutation in a family with lamellar ichthyosis.Methods Immunohistochemistry technique was used to detect the activity of transglutaminase1.Complete encoding sequences of TGM1gene were analyzed in this family by using PCR-DNA sequencing.Results No activity of transglutaminase1was detected in the proband's skin.A nonsense mutation of C604T located in exon4of TGM1gene was identified by PCR-DNA sequencing,which caused a premature termination of Q202X and a defective polypeptide truncated by615amino acids in C-terminus.A heterozygous C604T mutation was carried by both of the proband' s parents.Conclusions The proband of lamellar ichthyosis in this family shows loss of transglutaminase1activity,which is resulted from a truncated transglutaminase1coded by the homozygous mutant TGM1gene.

Transglutaminase 1 gene mutations in a family with lamellar ichthyosis / 中华皮肤科杂志

Objective To detect the mutations of transglutaminase 1 (TGM1) gene in a family with lamellar ichthyosis. Methods The genomic DNA was extracted from the proband and his family members. All the encoding exons and adjacent splice sites of TGM1 gene were amplified by PCR. Mutation scanning was carried out via direct bi-directional DNA sequencing. Also the homology of TGM1 was analyzed. Results In the proband, there was a C504T mutation located at codon 142 (R142C) in exon 3 of TGM1 gene, and a nonsense mutation of C1122T located in exon 7, which caused a premature termination of R348X and a defective polypeptide truncated by 470 amino acids in C-terminus. A heterozygote of C504T mutation was carried by the proband′s father and a heterozygote of C1122T mutation in the proband′s mother. The missense mutation of R142C was found at the conservation region of TGM1 gene. Conclusion The mutations of R142C and R348X in TGM1 gene are present in the patient with lamellar ichthyosis.