A new linkage group involved in sex determination in haplotilapiine cichlids

2021 ◽  
Author(s):  
Tetsumi Takahashi
Keyword(s):  
Linkage Group ◽  
Sex Determination

Linkage Analysis of Sex Determination in Bracon sp. Near hebetor (Hymenoptera: Braconidae)

Genetics ◽  
2000 ◽  
Vol 154 (1) ◽  
pp. 205-212
Author(s):  
Alisha K Holloway ◽  
Michael R Strand ◽  
William C Black ◽  
Michael F Antolin
Keyword(s):  
Linkage Group ◽  
Sex Determination ◽  
Rapd Markers ◽  
Random Amplified Polymorphic Dna ◽  
Parasitic Wasp ◽  
Specific Pattern ◽  
Diploid Males ◽  
Phenotypic Marker ◽  
Group I ◽  
Sex Locus

Abstract To test whether sex determination in the parasitic wasp Bracon sp. near hebetor (Hymenoptera: Braconidae) is based upon a single locus or multiple loci, a linkage map was constructed using random amplified polymorphic DNA (RAPD) markers. The map includes 71 RAPD markers and one phenotypic marker, blonde. Sex was scored in a manner consistent with segregation of a single “sex locus” under complementary sex determination (CSD), which is common in haplodiploid Hymenoptera. Under haplodiploidy, males arise from unfertilized haploid eggs and females develop from fertilized diploid eggs. With CSD, females are heterozygous at the sex locus; diploids that are homozygous at the sex locus become diploid males, which are usually inviable or sterile. Ten linkage groups were formed at a minimum LOD of 3.0, with one small linkage group that included the sex locus. To locate other putative quantitative trait loci (QTL) for sex determination, sex was also treated as a binary threshold character. Several QTL were found after conducting permutation tests on the data, including one on linkage group I that corresponds to the major sex locus. One other QTL of smaller effect had a segregation pattern opposite to that expected under CSD, while another putative QTL showed a female-specific pattern consistent with either a sex-differentiating gene or a sex-specific deleterious mutation. Comparisons are made between this study and the indepth studies on sex determination and sex differentiation in the closely related B. hebetor.

scholarly journals Sex determination in the GIFT strain of tilapia is controlled by a locus in linkage group 23

BMC Genetics ◽  
2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Khanam Taslima ◽  
Stefanie Wehner ◽  
John B. Taggart ◽  
Hugues de Verdal ◽  
John A. H. Benzie ◽  
...  
Keyword(s):  
Linkage Group ◽  
Sex Determination ◽  
The Gift

scholarly journals Mapping of Adaptive Traits Enabled by a High-Density Linkage Map for Lake Trout

2020 ◽  
pp. g3.401184.2020
Author(s):  
Seth R. Smith ◽  
Stephen J. Amish ◽  
Louis Bernatchez ◽  
Jeremy Le Luyer ◽  
Chris Wilson ◽  
...  
Keyword(s):  
Linkage Group ◽  
Sex Determination ◽  
Linkage Map ◽  
Body Shape ◽  
Lake Trout ◽  
Skin Pigmentation ◽  
High Density ◽  
Genomic Research ◽  
Linkage Groups ◽  
Telocentric Chromosomes

Understanding the genomic basis of adaptative intraspecific phenotypic variation is a central goal in conservation genetics and evolutionary biology. Lake trout (Salvelinus namaycush) are an excellent species for addressing the genetic basis for adaptive variation because they express a striking degree of ecophenotypic variation across their range; however, necessary genomic resources are lacking. Here we utilize recently-developed analytical methods and sequencing technologies to (1) construct a high-density linkage and centromere map for lake trout, (2) identify loci underlying variation in traits that differentiate lake trout ecophenotypes and populations, (3) determine the location of the lake trout sex determination locus, and (4) identify chromosomal homologies between lake trout and other salmonids of varying divergence. The resulting linkage map contains 15,740 single nucleotide polymorphisms (SNPs) mapped to 42 linkage groups, likely representing the 42 lake trout chromosomes. Female and male linkage group lengths ranged from 43.07 to 134.64 centimorgans, and 1.97 to 92.87 centimorgans, respectively. We improved the map by determining coordinates for 41 of 42 centromeres, resulting in a map with 8 metacentric chromosomes and 34 acrocentric or telocentric chromosomes. We use the map to localize the sex determination locus and multiple quantitative trait loci (QTL) associated with intraspecific phenotypic divergence including traits related to growth and body condition, patterns of skin pigmentation, and two composite geomorphometric variables quantifying body shape. Two QTL for the presence of vermiculations and spots mapped with high certainty to an arm of linkage group Sna3, growth related traits mapped to two QTL on linkage groups Sna1 and Sna12, and putative body shape QTL were detected on six separate linkage groups. The sex determination locus was mapped to Sna4 with high confidence. Synteny analysis revealed that lake trout and congener Arctic char (Salvelinus alpinus) are likely differentiated by three or four chromosomal fissions, possibly one chromosomal fusion, and 6 or more large inversions. Combining centromere mapping information with putative inversion coordinates revealed that the majority of detected inversions differentiating lake trout from other salmonids are pericentric and located on acrocentric and telocentric linkage groups. Our results suggest that speciation and adaptive divergence within the genus Salvelinus may have been associated with multiple pericentric inversions occurring primarily on acrocentric and telocentric chromosomes. The linkage map presented here will be a critical resource for advancing conservation oriented genomic research on lake trout and exploring chromosomal evolution within and between salmonid species.

scholarly journals AmhandDmrta2Genes Map to Tilapia (Oreochromisspp.) Linkage Group 23 Within Quantitative Trait Locus Regions for Sex Determination

Genetics ◽  
2006 ◽  
Vol 174 (3) ◽  
pp. 1573-1581 ◽  
Author(s):  
Andrey Shirak ◽  
Eyal Seroussi ◽  
Avner Cnaani ◽  
Aimee E. Howe ◽  
Raisa Domokhovsky ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Linkage Group ◽  
Sex Determination ◽  
Quantitative Trait ◽  
Trait Locus

Fine-mapping of a locus on linkage group 23 for sex determination in Nile tilapia (Oreochromis niloticus)

2010 ◽  
Vol 42 (2) ◽  
pp. 222-224 ◽  
Author(s):  
O. Eshel ◽  
A. Shirak ◽  
J. I. Weller ◽  
T. Slossman ◽  
G. Hulata ◽  
...  
Keyword(s):  
Linkage Group ◽  
Sex Determination ◽  
Fine Mapping ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus

DCT and EDNRB map to DogMap linkage group L07

2001 ◽  
Vol 32 (5) ◽  
pp. 321-321 ◽  
Author(s):  
S. M. Schmutz ◽  
J. S. Moker ◽  
V. Yuzbasiyan-Gurkan ◽  
D. Zemke ◽  
J. Sampson ◽  
...  
Keyword(s):  
Linkage Group

Sex determination banned in India

Nature ◽  
1996 ◽  
Vol 379 (6562) ◽  
pp. 201-201
Keyword(s):  
Sex Determination

Sex determination and Y chromosome constitutive heterochromatin

2019 ◽  
Vol 1 (1) ◽  
pp. 1-5
Author(s):  
Abyt Ibraimov
Keyword(s):  
Sex Determination ◽  
Y Chromosome ◽  
Constitutive Heterochromatin ◽  
Sex Differentiation ◽  
Secondary Sexual Characteristics ◽  
Biological Meaning ◽  
Heterochromatin Block ◽  
Sexual Characteristics ◽  
Open Question ◽  
Efficient Elimination

In many animals, including us, the genetic sex is determined at fertilization by sex chromosomes. Seemingly, the sex determination (SD) in human and animals is determined by the amount of constitutive heterochromatin on Y chromosome via cell thermoregulation. It is assumed the medulla and cortex tissue cells in the undifferentiated embryonic gonads (UEG) differ in vulnerability to the increase of the intracellular temperature. If the amount of the Y chromosome constitutive heterochromatin is enough for efficient elimination of heat difference between the nucleus and cytoplasm in rapidly growing UEG cells the medulla tissue survives. Otherwise it doomed to degeneration and a cortex tissue will remain in the UEG. Regardless of whether our assumption is true or not, it remains an open question why on Y chromosome there is a large constitutive heterochromatin block? What is its biological meaning? Does it relate to sex determination, sex differentiation and development of secondary sexual characteristics? If so, what is its mechanism: chemical or physical? There is no scientifically sound answer to these questions.

SEX DETERMINATION OF FETUS PRENATAL FROM MATERNAL PLASMA BY USING DUPLEX PCR TECHNIQUE IN GOAT

2014 ◽  
Vol 13 (1) ◽  
pp. 50-59
Author(s):  
A NisreenYasirJasim ◽  
Tahir A. Fahid ◽  
Talib Ahmed Jaayid
Keyword(s):  
Sex Determination ◽  
Maternal Plasma ◽  
Duplex Pcr
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