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Technical abbreviations

A ampere

AVE average

BCA bicinchoninic acid

bp base pair

BSA bovine serum albumin CT threshold cycle

DAPI 4’, 6-diamidino-2-phenylindole

DGRC Drosophila Genomics Resource Center DSHB Developmental Studies Hybridoma Bank ECL enhanced chemiluminescence

EDTA ethylenediaminetetraacetic acid FISH fluorescence in situ hybridization NGS normal goat serum

nt nucleotide

PBS phosphate buffered saline PBT PBS-Tween (buffer) PBTB PBT-blocking (buffer) PCR polymerase chain reaction PFA paraformaldehyde

qPCR quantitative PCR

qRT-PCR quantitative reverse transcription PCR Rpm revolutions per minute

RT reverse transcriptase RT room temperature S2 cells Schneider 2 cells SD standard deviation

SEM standard error of the mean Tris tris-hydroxymethyl-aminomethane

Biological abbreviations

AMPK AMP-activated protein kinase A-P axis anterior-posterior axis

BTB blood-testis barrier C-terminus carboxyl-terminus cDNA complementary DNA DNAse deoxyribonuclease CySCs somatic stem cells

DGC Dystrophin-associated Glycoprotein Complex Dme Drosophila Melanogaster

DNA deoxyribonucleic acid Dre Danio rerio

Drosophila Drosophila melanogaster

dsRBD double stranded RNA binding domain protein E.Coli Escherichia coli

ECM extracellular matrix GB gonial blast

GO Gene Ontology GSCs germline stem cells hsa homo sapiens

mGFP membrane GFP

miRNA microRNA

mmu mus musculus mRNA messenger RNA MTJ myotendinos junction

PKA cAMP-dependent protein kinase

Pol polymerase

Pre-miRNA precursor microRNA Pri-miRNA primary microRNA RNA ribonucleic acid

RISC RNA-induced silencing complex RNAi RNA interference

RNase ribonuclease

rRNA ribosomal RNA siRNA small interfering RNA SV seminal vesicle

UAS upstream activation sequence UTR untranslated region

Gene and protein names

act actin

Add adducin Arm armadillo Cora coracle Chic chickadee

Dg dystroglycan

Dlg discs large Dys dystrophin Eya eyes absent

GluR glutamate receptor IIA Hts hu lo tai shao

How held out wings LanA/B laminin A Mega mega trachea Mei-P26 meiotic P26

MHC myosin heavy chain

mir-310s refers to miR-310, miR-311, miR-312, and miR-313 together miR-975C refers to miR-975, miR-976, miR-977 together

miR-959C refers to miR-959, miR-960, miR-961, miR-962together Nrx-IV neurexin IV

nNOS nitric oxide synthase PH3 Phospho-Histone H3 Scg sarcoglycan

Syn1 syntrophin-like 1

Tj traffic jam

Yki yorkie

Zfh-1 zinc finger protein 1

Symbols

°C degree celsius

CO2 carbon dioxide

G gram

μg microgram

μl microliter

μM micromolar

h hour

kbp kilo base pair

kDa kilodalton

Mb mega base

ml milliliter

min minute

mM milli molar

NaCl sodium chloride

NaH2PO4 monosodium phosphate Na2HPO4 disodium phophate

NaOH sodium hydroxide

ng nanogram

V volt

Acknowledgement

Foremost, I would like to thank my supervisor Halyna R. Shcherbata for giving me an opportunity to peruse my PhD under her supervision. Her continuous guidance, suggestions, and challenges has shaped me to be a better student in these 3.5 years. I not only got to realize what it takes to be a good scientist, but also a successful PI and a great human being.

Some of the life lessons I took watching her closely will aspire me to be better in many ways in the years to come.

Next, I would like to thank my thesis committee members Stefan Bonn and Jörg Großhans for their suggestions, ideas, criticism and support for making this project a success. I would like to especially thank Stefan Bonn for always supporting my project and being available whenever I needed his suggestions. I would like to thank Roland Dosch, Martin Göpfert and Ahmed Mansouri for joining as my extended committee members.

My sincere gratitude to my current and previous lab mates who gave me their valuable scientific input, technical support, and especially for their company, creating a family like environment. Travis, for always motivating and helping me in every possible way to make me focus and laugh even at times of doubts and confusions. For more being a friend than just a colleague. You kept me optimistic during my times of discouragement and made weekends work a happy place to be. Ömer, for sharing his experiences as a graduating PhD student and answering all my concerns during the initial phase of my project. Mariya, for teaching me tools and techniques of the lab during my time as an intern and making me familiar with the department. Andriy, for all the help and support during the entire project.

Rucha, for helping me during the final phase of my project. Jasmine, for creating Dg1.10G mutants that came handy on this project. To the whole Herbert Jäckle Department for their input during departmental seminars, support through reagents and technical contributions.

My students, Tadas, Liezel, Daniel, and Alejandra who helped me in my project. I got an opportunity to grow as a mentor and learned a lot from them.

GGNB for giving an opportunity to learn many aspects of science. I have benefited a lot from scientific and soft skill courses throughout these years. I have enjoyed being their student representative, editorial board in GGNB times and as a part of organizing committee for WoCaNet symposium. I have come to realize many of my strengths and weakness throughout the exposures I got with these activities. I would like to acknowledge the travel grant that allowed me to present my work in international symposium.

To my friends in Göttingen, for adding healthy dosage of laughter and craziness throughout these years. Prajwal, for always listening, making tea breaks more compelling, sharing enthusiasm and frustrations and adding positivity in everyday life. Shoba, for exciting conversations about science, career and for crazy moments turning Göttingen a familiar place to be.

To my near and dear friend, Elizabeth, for making my adaptation easier since my first day in Germany. Our long conversations, life experiences always lit positivity in me. Manita, for listening to my worries and fruitful tips and a continuous reminder to taking care of myself.

My childhood buddies (RSKDM), for teaching me a meaning of friendship for past 18 years.

Losing one of you during these years was a shock and a realization of life beyond dreams and career.

To my family, my parents for believing in me, for always being enthusiastic to see me becoming a Doctor despite of not knowing either my project or the nature of my research.

My sisters, who are my backbone. They believed so much in me that they never let me fail.

Especially Priti, for taking care of our parents and home all these years. Kriti, for always encouraging me to stay on my track. My in-laws, for always motivating me to give my best.

I think I stressed them more than I stressed myself during the last phase of my project. To Bhupesh and Semi for their support and accepting my absence during family engagements.

To my husband Bhawesh, my life support, for his continuous support, love and for keeping up with me throughout these years. For taking care of our home, my smallest needs, for not giving up on me and not letting me give up. You truly deserve a share of my Doctor title.