A new β2 microglobulin mutation found in a melanoma tumor cell line

Beta2 microglobulin mutations are an important mechanism for HLA class I total loss, (phenotype No. I) and have been described in colon carcinomas, melanomas and lymphomas. We describe a new beta2 microglobulin mutation detected in the melanoma cell line GR-34. The new mutation reported here was identified as a deletion of 4 bases (TTCT) in the highly repetitive sequence CTCTCTCTTTCT located in the leader sequence of the beta2 microglobulin gene at codon 15-16 of exon 1. The mutation produces a frameshift in the open reading frame sequence with the appearance of a stop codon at position 42. We also demonstrate that the second beta2 microglobulin gene is deleted. Comparisons with beta2 microglobulin mutations in other tumor cell lines suggest a mutation hot spot in exon 1.     

Gynecological clinical study in girls and adolescent victims of sexual abuse

In spite of a very important under-registration, sexual abuse represents a social and public health problem worldwide. In Mexico, estimated prevalence of sexual abuse in women is 17.3%, half of them in youngsters under 15 years old. Most of cases have a late gynecological evaluation, due to a delay in a formal complaint. Gynecologist or pediatrician are the specialists who most frequently perform the genital examination of girls suspected of sexual abuse, due to this a complete knowledge of the topic is necessary in order to make an accurate diagnosis, register the physical findings and give prompt medical and psychological treatment as well as follow up to the patient. Despite the low risk of acquiring a sexually transmitted infection, it is important to evaluate the use of prophylactic treatment and the prevention of unwanted pregnancy with emergency contraception. Big efforts are being made by preventive programs on sexual abuse, sexually transmitted infections and unwanted pregnancy, all of which are serious problems in Mexican children and youths, and should constitute a fundamental part of the public politics on sexual health.