| Title |
Discovery of the youngest sex chromosomes reveals first case of convergent co-option of ancestral autosomes in turtles
|
|---|---|
| Published in |
Chromosoma, February 2016
|
| DOI | 10.1007/s00412-016-0576-7 |
| Pubmed ID | |
| Authors |
E. E. Montiel, D. Badenhorst, J. Tamplin, R. L. Burke, N. Valenzuela |
| Abstract |
Most turtle species possess temperature-dependent sex determination (TSD), but genotypic sex determination (GSD) has evolved multiple times independently from the TSD ancestral condition. GSD in animals typically involves sex chromosomes, yet the sex chromosome system of only 9 out of 18 known GSD turtles has been characterized. Here, we combine comparative genome hybridization (CGH) and BAC clone fluorescent in situ hybridization (BAC FISH) to identify a macro-chromosome XX/XY system in the GSD wood turtle Glyptemys insculpta (GIN), the youngest known sex chromosomes in chelonians (8-20 My old). Comparative analyses show that GIN-X/Y is homologous to chromosome 4 of Chrysemys picta (CPI) painted turtles, chromosome 5 of Gallus gallus chicken, and thus to the X/Y sex chromosomes of Siebenrockiella crassicollis black marsh turtles. We tentatively assign the gene content of the mapped BACs from CPI chromosome 4 (CPI-4) to GIN-X/Y. Chromosomal rearrangements were detected in G. insculpta sex chromosome pair that co-localize with the male-specific region of GIN-Y and encompass a gene involved in sexual development (Wt1-a putative master gene in TSD turtles). Such inversions may have mediated the divergence of G. insculpta sex chromosome pair and facilitated GSD evolution in this turtle. Our results illuminate the structure, origin, and evolution of sex chromosomes in G. insculpta and reveal the first case of convergent co-option of an autosomal pair as sex chromosomes within chelonians. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Canada | 3 | 43% |
| Unknown | 4 | 57% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 4 | 57% |
| Scientists | 3 | 43% |
Mendeley readers
The data shown below were compiled from readership statistics for 41 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 1 | 2% |
| Unknown | 40 | 98% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 7 | 17% |
| Student > Ph. D. Student | 6 | 15% |
| Student > Bachelor | 4 | 10% |
| Student > Doctoral Student | 4 | 10% |
| Student > Master | 4 | 10% |
| Other | 7 | 17% |
| Unknown | 9 | 22% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 18 | 44% |
| Biochemistry, Genetics and Molecular Biology | 10 | 24% |
| Environmental Science | 3 | 7% |
| Neuroscience | 1 | 2% |
| Unknown | 9 | 22% |
Attention Score in Context
This research output has an Altmetric Attention Score of 6. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 09 February 2016.
All research outputs
#5,859,102
of 22,842,950 outputs
Outputs from Chromosoma
#131
of 757 outputs
Outputs of similar age
#95,448
of 397,089 outputs
Outputs of similar age from Chromosoma
#2
of 18 outputs
Altmetric has tracked 22,842,950 research outputs across all sources so far. This one has received more attention than most of these and is in the 74th percentile.
So far Altmetric has tracked 757 research outputs from this source. They receive a mean Attention Score of 3.7. This one has done well, scoring higher than 82% of its peers.
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