International Journal of
Genetics and Molecular Biology

  • Abbreviation: Int. J. Genet. Mol. Biol.
  • Language: English
  • ISSN: 2006-9863
  • DOI: 10.5897/IJGMB
  • Start Year: 2009
  • Published Articles: 134

Full Length Research Paper

Contribution of cytogenetic and molecular biology in disorders of sex development diagnosis: About 55 cases

Fatou Diop GUEYE
  • Fatou Diop GUEYE
  • Doctoral School of Life, Health and Environmental Sciences, ED-SEV, Biology and Human Pathologies, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
  • Google Scholar
Fatimatou DIA
  • Fatimatou DIA
  • Laboratory of Clinical Cytology-Cytogenetic-Biology of Reproduction and Human Development, Cytogenetic Unit, Aristide Le Dantec Hospital, Dakar, Senegal.
  • Google Scholar
Arame NDIAYE
  • Arame NDIAYE
  • Laboratory of Clinical Cytology-Cytogenetic-Biology of Reproduction and Human Development, Cytogenetic Unit, Aristide Le Dantec Hospital, Dakar, Senegal.
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Adji Dieynaba DIALLO
  • Adji Dieynaba DIALLO
  • Doctoral School of Life, Health and Environmental Sciences, ED-SEV, Biology and Human Pathologies, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
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Mame Venus GUEYE
  • Mame Venus GUEYE
  • Department of Biology and Functional Explorations, Histology-Embryology Laboratory, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
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Ndiaga Diop
  • Ndiaga Diop
  • Department of Biology and Functional Explorations, Histology-Embryology Laboratory, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
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Mama SY DIALLO
  • Mama SY DIALLO
  • Department of Biology and Functional Explorations, Histology-Embryology Laboratory, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
  • Google Scholar
Oumar FAYE
  • Oumar FAYE
  • Department of Biology and Functional Explorations, Histology-Embryology Laboratory, Faculty of Medicine, Pharmacy and Dentistry, Cheikh Anta Diop University, Dakar, Senegal.
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  •  Received: 21 November 2022
  •  Accepted: 13 January 2023
  •  Published: 31 January 2023

 ABSTRACT

Disorders of sex development (DSD) when diagnosed early is important as it pose a real public health problem in Senegal. Among the supporting tools, molecular ones, which are not available everywhere are very useful. In this context, cytogenetic and molecular analyses were implemented in cytology laboratory at the Aristide Le Dantec hospital to enhance the DSDs diagnosis as well as evaluate the impact of the parents' age on such abnormalities. 55 cases of DSD have been received in the cytology laboratory for which cytogenetic (Barr chromatin and GTG karyotype) and molecular (SRY gene research) techniques have been used to characterize these anomalies according to the standards described in the international nomenclature. Three categories of DSD were found, namely 46,XX DSD, 46,XY DSD and chromosomal DSD. SRY is present in 4 patients 46,XX and absent in 3 patients 46,XY and results showed that the diagnosis is made earlier than previously (about 07 years). The study thus suggests the importance of complementarity (cytogenetics and molecular biology) in the diagnosis of DSD but also and especially the importance of early diagnosis from birth. Analysis of the epidemiological data also showed a slight correlation between maternal age and DSD. This showed us that a better characterization of DSD via increasingly powerful tools helps understanding on such pathologies and allows good medical care for patients.

 

Key words: Disorders of sex development (DSD), karyotype, SRY, hermaphroditis.


 INTRODUCTION

Disorders of sex development (DSD) are rare abnormalities that can affect 1 to 3 of 10,000 children at birth (Bashamboo et al., 2010; Goultaiene et al., 2016; Mastrandrea et al., 2012). They are defined as individual whose genitals are difficult or even impossible to describe. However for Guillot (2008), these anomalies account for more than 10% of the population because any person who does not correspond to the morphological standards is de facto considered as an intersex. Moreover, these anomalies constitute an inadequacy between the sex reported at birth and the real sexual identity of the individual (Azonbakin et al., 2016; Gueniche et al., 2008; Guillot, 2008; Querfani et al., 2007). Advances in biology have shown us that the sex definition is not only based on physical criteria but requires an integrative approach (Hersmus et al., 2012). After the anatomical criterion (presence of penis or vagina), we have the gonadic (testicular or ovarian), genetic (XY or XX) or even the social criteria (male or female) (Azonbakin et al., 2016; Hersmus et al., 2012; Poulat et al., 1992; Sultan et al., 2001). An absence of one of these criteria can therefore lead to one of the known forms of DSD.

 

These anomalies were the subject of a new nomenclature based on an international consensus in 2006 (Diakité et al., 2013; Kim and Kim, 2012; Wiesemann et al., 2010). They can thus be classified as 46,XX DSD, 46,XY DSD and sex chromosome DSD, corresponding respectively to the terminology of female pseudo-hermaphroditism, male pseudo-hermaphroditism and true pseudo-hermaphroditism, which are now proscribed as they have a pejorative connotation (Lee et al., 2006). These DSDs cover broad clinical phenotypes that are essential to identify regardless the period of their expression (Folligan et al., 2012; Idrissi, 2012). Indeed, individuals affected by true hermaphroditism (also named ovotesticular DSD) possess both testicular and ovarian tissues  associated with karyotypes that can be 46,XX (60% of cases), mosaics (30%) or 46,XY (only 10%) (Querfani et al., 2007). Furthermore, in sex chromosome DSD category we can find pathologies such as Turner and Klinefelter syndromes (Lux et al., 2009; Öçal, 2011).

 

On the other hand, the 46,XY DSD individuals derived from an inadequate masculinization of a genetically male embryo (Diakité et al., 2013; Goultaiene et al., 2016). They are associated with male gonads, but external genitalia remain ambiguous due to a pronounced deficiency of the hormone derived from testosterone (Azonbakin et al., 2016; Idrissi, 2012; Lee and Houk, 2008; Lin et al., 2007) . The last category 46,XX DSD refers to the presence of ovaries with external genitalia ambiguous and virilized to varying degrees such as penniform clitoris. This may be due to early exposure to androgens related to an adrenal tumor or inappropriate hormone therapy in pregnant women (Diakité et al., 2013; Folligan et al., 2012). The impact of these anomalies is heavy all over the world with a prevalence of 0.1 to 2% (Creighton and Minto, 2001). However, this estimate is even more worrying in the most disadvantaged areas because of the lack of opportunities to diagnose these infections as soon as  possible  (Azonbakin  et  al.,  2016; Diakité et al., 2013; Folligan et al., 2012). 

 

In Senegal, public cytogenetic structures specializing in the diagnosis and/or screening of congenital malformations are rare despite the rapidly expanding techniques (Matejka and Cribiu, 1987; Popescu, 1975; Popescu et al., 2000) widely used in cytogenetic to facilitate diagnosis in sub-Saharan Africa area (Diakité et al., 2013). Moreover, molecular biology techniques tend to be important in diagnosis of these diseases due to genetic recombination with, for example the SRY gene case that can sometimes be found on X chromosome (Faye et al., 2007; Gao et al., 2013). In addition, other techniques such as the study of Barr chromatin is sometimes used to make a first-line diagnosis of these anomalies (Artois and Salmon, 2009). This is a very rapid medical test to determine the percentage of Barr’s corpuscles that correspond to the condensation of the second X chromosome in females, which range from 15 to 30% while it is between 0 and 5% for male epithelial cells. We can face a mosaic case where the percentage is found between 6 and 14% (Faye et al., 2007). Nevertheless, Barr’s chromatin results can be influenced by several factors (Gueye et al., 2014) and the integration of these techniques could be of great value in the diagnosis of DSDs.

 

Despite the remarkable human variability, our gender identities are heavily constructed, socially and culturally and yet there is little data about the impact of these DSD in Senegal. Similarly, the genetic aspects of these abnormalities are little studied in Africa and therefore in Senegal especially in the most disadvantaged areas because of the lack of adequate diagnostic tools (Ediati et al., 2015). Due to the high birth rate and inbreeding but also to the continuation of procreation until a late age, every year there are a large number of births of children with genetic abnormalities, especially in families from disadvantaged areas (Juniarto et al., 2016). In addition, the management of these sexual disorders faces local beliefs that consider these abnormalities abnormal and shameful (Warne and Raza, 2008; Ediati et al., 2015), thus, leading to secrecy, social isolation and stigma (Ediati et al., 2017). These patients are therefore faced a real problem of identity, which makes difficult to see if the term is applicable to obtain a national incidence rate and therefore does not really reflect the importance of this problem. In this context, we aim to identify and classify through genetic analysis (cytogenetic and molecular techniques) the DSDs faced in Laboratory of Clinical Cytology - Cytogenetic - Reproductive Biology at the Le DANTEC hospital for better orientation and management of patients.


 METHODOLOGY

Patients and samples

 

The study was carried out in the Cytogenetic Unit of the Clinical Cytology-Cytogenetic-Reproductive Biology Laboratory of the Aristide Le Dantec Hospital (HALD), where only external patients received for a DSD indication have been integrated to the study. Clinical examination was performed and various information were taken such as declared sex (at birth), age of patient and parents at the diagnostic time, ethnicity and geographic origin as shown in Figure 1 (Table 1). All these information are then compiled and analysed under R v3.1.1. (R Development Core Team, 2008)using Fisher's exact test (with a significance level of 0.05) to see how the pathology is related or not to the age of parents.

 

 

Genetic studies

 

Several analyses were carried out, namely the Barr chromatin test, the GTG karyotype and the amplification of the SRY gene using three types of sampling. The specific techniques are explained in the following.

 

The chromatin test of Barr

 

This test was carried out from epithelial cells taken with a spatula by scratching the internal mucosa of the cheek followed by a spread on a slide and then an instantaneous fixing using the lacquer. Subsequently, cytoplasm lysis with chloric acid 1N (1N) was carried out at 56°C for 7 min followed by a series of hydration and dehydration with alcohol and distilled water. Finally, GUARD coloration was made before examining on an optic Microscope  at least 200 interphasic nucleic (Faye et al., 2007).

 

GTG Karyotype

 

Venous blood was taken on a heparin tube and the cell culture was made within 72 h following the sampling according to the protocol described by Dia (2015), Gao et al. (2013) and Tijo and Levan (1956).

 

This technique was based on a culture at 37°C in the presence of 5% CO2 and was done by inoculating 0.5 ml of blood. Before staining the Giemsa slides, enzymatic digestion was carried out in a trypsin solution for the labelling of G-band chromosomes followed by microscopic observation to analyse the metaphases and thus establish the GTG karyotype of the different patients concerned.

The establishment of the karyotypes was carried out using an imaging system composed of an epifluorescence microscope associated with the image capture and processing software "Leica CW 4000 cytogenetics".

 

Amplification of SRY gene

 

Blood was sampled on an EDTA tube and investigated the SRY gene using PCR amplification. SRY is a gene that plays an important role in masculinization because its codes for the factor that determining the testicles (TDF). This gene is located on Yp11.31 and can be transferred to the distal end of the short arm of the X chromosome or autosomes following an unequal crossing-over during paternal meiosis (Barbaux et al., 1995; MacLean et al., 1997; Wu et al., 2014). Genomic DNA was extracted from 55 patients using the DNeasy 96 Blood & Tissue Kit (QIAGEN, Hilden, Germany). The SRY gene was amplified for a total of 22 patients selected who were carrying inconsistencies between karyotype and chromatin of Barr results but also ambiguous external genitalia. We used primers pair SRY-F 5-CAT GAA CGC ATT CAT CGT GTG GTC-3 and SRY-R5-CTG CGG GAA GCA AAC TGC AAT TCT T-3 (Settin et al., 2008). PCR reactions were performed in a 30 μL volume containing 17.1 μL of milliq water, 3 μL of 1X buffer, 0.6 μL of 0.5 mM MgCl2, 0.1 μL dNTP, 3 μL of each primer at 1 μM and 0.1 μL of Taq (5 μL/μL). After an initial denaturation at 94°C for 2 min, conditions consisted of 35 cycles of a denaturation phase at 94°C/15 s, an hybridization at 65°C/20 s and elongation at 72°C/20 s. The program finished with a final elongation at 72°C/10 min.

 

 


 RESULTS

Chromatin of Barr

 

Only two individuals (3.64%) of all patients did not perform the Barr chromatin test (Table 2). The three known categories have been found, these were the male (61.82%), the female (21.82%) and the intermediate chromatin sex (12.73%). For all the patients who did this test, 58% showed congruent results with the sex reported at the birth. However, for 42% of the patients, the diagnosis was different from the declared sex with seven possibilities that have been encountered (Table 3).

 

Indeed, following the Barr chromatin analysis, for the 22 patients whose sex was declared different from the chromatin sex results, three sex groups were proposed (Feminine, Male, and Undetermined). The first group "Feminine" concerns twelve individuals declared female, nine of them   have  a  male  chromatin  sex,  while  the remaining three have an intermediate chromatin sex. The second group, "Male", consists of seven declared male patients, five of them had female chromatin and two intermediate chromatin sexes. The last group named "Indeterminate" referred to three patients of undetermined and/or undeclared sex at birth. In the latter group, we found the three known chromatin sex categories (Female, Male and Indeterminate).

 

 

The karyotype GTG

 

For the 55 patients studied, more than 85% performed karyotype tests. Five chromosomal formulas 46,XY (43.64%), 46,XX (29.09%), 46,XY / 46,XX (5.45%), 47,XXY (5,45%) and 46, XX / 45, X (1.82%) were found in the study  population.  After the analysis, 77% of the cases showed congruent results with the declared sex, while in 23% of the cases, the diagnoses were different with five possibilities encountered (Table 4). Indeed, in the "Feminine" group, we found four patients, all of them had a male chromosomal sex. In the group "Male" where we recorded five patients, three had a female chromosomal sex and 2 had a mosaic. In the last "Indeterminate" group, we obtained one female chromosomal sex patient and one chromosomal mosaic patient.

 

 

 

Search the SRY gene

 

The amplification of the SRY gene as shown in Figure 2 was based on the results of the karyotype and chromatin of Barr. For the 22  DNAs  of patients thus analysed, SRY was found (SRY+) in 9 patients of them while absent (SRY-) in the remaining (Table 2).

 

Comparisons between genetic data and DSDs classification

 

Results based on karyotype reveal that 72% are consistent with those of Barr chromatin and SRY gene search; that is to say, it refers to the same sex categories (Masculine or Feminine). On the other hand, for 28% of the cases the results are different from several cases of figures encountered (Table 5). Five patients showed an intermediate Barr chromatin level in the absence of the SRY gene and associated with a male (01), female (01) or mosaic (03) karyotype; other cases (08 patients) presented a male type of Barr chromatin associated with a karyotype of a female type (06 patients with the presence of the SRY gene in 03 of them), male (01 patient with no SRY) and mosaic (01). Finally, three patients had female type Barr chromatin levels associated with 47,XXY chromosomal formulas suggestive of Klinefelter syndrome.

 

The various pathologies listed are mainly in the anomalies of testicular development, anomalies of androgens and anomalies of ovarian development. The three classes defined in the international nomenclature, namely 46,XY DSD, 46,XX DSD and DSD chromosomes have all been found in our patients. Among these three classes, category 46,XY  DSD is the most represented (p = 0.0007). We also note in the context of chromosomal DSDs the presence of Turner syndromes in mosaic and Klinefelter as well as three cases of ovotesticular DSD.

 

 

Impact of age on pathology

 

The average age of patients received is 9.7 years with extremities ranking from 4 days to 48 years. The results of the different age classes are as shown in Figure 3. The most significant age group (p = 1.239e-08) varies from 0 to 5 years with 67.28%, followed by the classes [6 to 10 years] and [11 to 15years] each representing 9.1%; followed by classes [16 to 20] with 7.28%; the class [>25 years] represented 5.45% and finally the class [21 to25 years] represented 1.82%. The Fisher test carried out between the age group and the pathology categories showed a very significant value (p = 1.239e-08). The parental age ranged from 25 to 76 years for fathers with an average of 39.39 years and between 19 and 63 years for mothers with an average of 32.29 years. The correlation between the pathology observed in the patient and   the age of the parents is slightly significant for mothers (p = 0.02) compared to fathers (p = 0.08).

 

 


 DISCUSSION

Involvement of age in DSDs patients

 

The importance of DSD compared to other types of pathologies can be explained by the fact that these abnormalities most often affect sexual chromosomes with the presence in most of these patients of a phenotype suggestive organ (penoclitoris, ovotestis, testicular or clitoral hypertrophy, android morphotype, among others). As it is known, during ovogenesis, each of the 23 pairs of chromosomes had an equal risk of error during segregation, but these risks are higher in sexual chromosomes (Kamiguchi et al., 1994). Thus, the results obtained showed an age of consultation relatively young for these patients (almost 10 years). This average compared to those obtained in European countries seems to be considerably higher. Indeed, in those countries, 60% of the children with DSD are diagnosed at birth or even during the prenatal period (Gueye et al., 2014; Mastrandrea et al., 2012). In our case, only 12 of the 55 cases of DSDs came for medical consultation before one year. However, it should be noted that the 3 oldest patients had Klinefelter's syndrome and therefore, came to consultation for primary sterility. The average age without the three later patients decreases to 7 years. This shows a great improvement of this average in Africa, if we just look back ten years ago in the studies carried out in the sub-Saharan area (an average: 14 years on the medical care of DSDs in Mali in 2003) (Kossi, 2003), 18.75 years on the sexual ambiguities in Dakar in 2001 (Ndiaye, 2001), 5 years concerning the surgical management of DSDs in Dantec Hospital HALD in 2004 (DIOUF, 2004). This delay in consultation (about 7 years) compared to developed countries may be due to the scarcity of specialized structures in these DSDs affections but also can be explained by several other reasons: lack of information and specific training that would lead to a rapid and early referral of patients for care (Folligan et al., 2012).

 

The socio-economic reasons are related to the fact that most of the patients are from the rural areas, which could cause inaccessibility to adequate services, the level of awareness but also the support (financial, logistic, etc). Furthermore, our data showed a slight correlation between maternal age (slightly increased) and the presence of these abnormalities in the patients studied. 

 

Several studies have for long been interested in the impact of parental age on the occurrence of such pathologies. Maternal age is the only one that has an unequivocal link with number chromosomal abnormalities, especially trisomy 21 (Vekemans, 2003; Pellestor, 2004). On the other hand, and more recently, the advanced paternal age showed to be implicated in the occurrence of congenital anomalies due to the mutations that occur during spermatogenesis. Such mutations occurrence increases with age and should be checked in further studies later.

 

Contribution of genetic methods in the diagnosis of DSDs

 

Several chromosomal formulas have been found, highlighting both the importance of clinical diagnosis and the genetic methods used here (Barr Chromatin, Karyotype and SRY gene research). The results obtained by the karyotype, the Barr chromatin and the search for the SRY gene have allowed us to find a genetic sex congruent with the sex declared except for a few patients in whom the different analyses carried out one by one appear contradictory but interpreted together allow us to strengthen explanation of the phenotypes. Among these, three of them represented true cases of hermaphroditism corresponding to chromosomal DSDs. The presence of the two genotypes has the effect of diluting the percentage of Barr chromatin present in the patient, thus explaining the result obtained. Moreover, in four of the other patients we have evoked the translocation of the TDF on the X chromosome, which could be confirmed by molecular biology during analysis of SRY gene. 

 

In the case of the few patients, the X chromosome (normally inactivated) had to be activated by the presence of this TDF, which allows it to behave like a Y chromosome and could therefore, explain the incongruence between the tests on the one hand, but also the presence of male external genitalia for these patients. Indeed, the SRY gene is often detected in 80% of XX men and 10% of true hermaphrodites XX (Barbaux et al., 1995) as shown in our study where the SRY gene was found only in individuals 46,XX. These different cases illustrated the fact that the Barr chromatin test must be done for any new born with an abnormality of the external genital organs but also must always be supplemented by a karyotype whenever possible to exactly know the chromosomal formula of the patient concerned (Ndiaye, 2001). Indeed, this examination already makes it possible to distinguish patients with more than one sexual chromosome X from those who have one or those who lack one. This does not mean that Barr chromatin is not useful when the karyotype has been performed as in some cases, Barr’s chromatin may be indicative or even indispensable (Gueye et al., 2014).

 

The results also show that we can never be satisfied with Barr Chromatin alone in a DSDs diagnosis.

 

Cytogenetic analysis must always include a karyotypes (Diakité et al., 2013; DIOUF, 2004) which makes it possible to know the chromosomal formula of an individual (Ndiaye, 2001) and may prove to be important in the mosaics cases (46,XX/46,XY) as found in three of our patients. Other cases of mosaics have also been encountered, the latter being rather due to non-homogeneous syndromes and corresponding to the Turner's syndrome in our case (46, XX /45, X0) which dilute the barr chromatin thus found.

 

Finally, we found the Klinefelter syndrome in three of our patients whose Barr Chromatin tests revealed a rate that refers to the female chromatin sex, which is explained by the presence of the second X chromosome set found in the karyotype. On the other hand, the male phenotype is due to the expression of the genes on the Y chromosome. Indeed, the Y chromosome plays a dominant role in the determinism of the testis. Independently of the number of X chromosomes, an individual with only one Y chromosome develops in the male direction (Poulat et al., 1992; Barbaux et al., 1995; Al  Jurayyan, 2011).


 CONCLUSION

Disorders of sex development constitute a real public health problem and malformations are the leading cause of infant mortality. Cytogenetic is of great value in the diagnosis and management of patients. The development and integration of the techniques of molecular biology via the research of the SRY thus made it possible to reinforce the reliability of the results. Indeed, the karyotype and the Barr chromatin have limits (intermediate level of chromatin of Barr or resolution of micro-rearrangements to be detected), hence the necessity to use molecular cytogenetics to refine the diagnosis. Analysis of epidemiological data showed a slight correlation between maternal age and pathology. Of course, these results could be related to the small size of our study population and the missing data encountered during the analysis. The latest studies have clearly shown that the age of consultation is becoming increasingly younger over the years, which is a major advance mainly due to the development of cytogenetic techniques but also and especially for molecular biology. This study induces us to orient ourselves towards molecular cytogenetics, which would allow many cases to find an answer and therefore a suitable treatment.


 CONFLICT OF INTERESTS

The authors have not declared any conflict of interests.



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