centralna dogma euhromatin i heterohromatin. struktura i...
TRANSCRIPT
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PRINCIPI GENETIKE 8
Centralna dogma
Euhromatin i heterohromatin.
Struktura i funkcija hromozoma.
Genetičke osnove deobe ćelija.
Ponašanje hromozoma u mitozi i mejozi.
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CENTRALNA DOGMA
GEN?
Deo DNK (linearni redosled nukleotida) potreban
za sintezu jednog proteina ili jednog molekula RNK
Gen za određeno svojstvo uvek se nalazi na
istom mestu na hromosomu koje se naziva
genski lokus.
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Kako se prenosi kroz generacije?
Kako se prenosi informacija sa njih unutar
same ćelije (do ribozoma gde se na osnovi njih
sintetišu proteini)?
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Centralana dogma molekularne
biologije (Crick, 1970)
Kroz generacije:
Replikacija - potomačke ćelije dobijaju iste gene kao
ćelije od koje su nastale.
Unutar same ćelije:
DNK protein
Transkripcija: iRNK
Translacija: tRNK
RNK
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Pojam heterohromatina i euhromatina
HETEROHROMATIN – više kondenzovan, tamno obojen neaktivan u transkripciji
EUHROMATIN – svetliji, manje kondenzovan, aktivan u transkripciji
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JEDRO
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Humani kariotip (2n = 46, XY) obojen tehnikom
G-traka
konstutivni
heterohromatin
euhromatin
Centromerni
heterohromatin
X hromozom
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A. K A R I O T I P,
B. K A R I O G R A M,
C. I D I O G R A M
A
C
B
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Kariogram psa 2n=78,XY
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Kariogram mačke
2n=38,XY
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Kariogram svinje 2n=38,XY
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Kariogram govečeta 2n=60,XX
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Kariotip bika obojen
tehnikom G-traka,
2n = 60, XY.
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Kariogram jarca
2n=60,XY
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Kariogram ovna
2n=54,XY
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Kariogram kobile
2n=64,XX
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Kariogram kokoši
2n=18,ZW
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Kariogram radilice medonosne pčele
2n=32,XX
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Normalni kariotip svinje (2n=38, XX)
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FUNKCIJA HROMOZOMA
Poređenje kariotipova dve srodne vrste jelena: A. Muntacus reevesi i B. Muntiacus muntiak .
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Ne postoji direktna korelacija između stepena filogentskog razvoja i
broja hromozoma. Mada se kod srodnih vrsta može da javi sličan broj
hromozoma, poznati su primeri da broj hromozoma znatno razlikuje
kod veoma srodnih vrsta. Poređenjem broja hromozoma dve veoma
srodne vrste jelena, utvrđeno je da vrsta Muntiacus munitak iz Indije
ima samo dva para autozoma i tri polna hromozoma, dok vrsta
Muntiacus reevesi iz Kine ima 22 autozoma i dva polna hromozoma
Hromozomi svojim ponašanjem tokom ćelijskog ciklusa omogućavaju
ispoljavanje genetičkog materijala potrebno za ostvarivanje fenotipa
ćelije, kao i ravnomernu raspodelu genetičkog materijala u ćerke ćelije
pri ćelijskoj deobi
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POLIPLOIDIE
(euploidie)
ANEUPLOIDIE
(heteroploidie)
MZXOPLOIDIE
(mozaicizam)
HIMERIZAM
BALANSIRANE
HROMOZOMSKE ABERACIJE
STRUKTURNE NUMERIČKE
NEBALANSIRANE
DELECIJE:
INTERSTICIJALNE
TERMINALNE,
RING HROMOZOMI
IZOHROMOZOMI
DUPLIKACIJE
INVERZIJE:
PARACENTRIČNE
PERICENTRIČNE
TRANSLOKACIJE:
RECIPROČNE
ROBERTSONOVE
(centrične fuzije),
TANDEMSKE
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Kariogram triploidnog fetusa čoveka, 2n = 69, XXY
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Aberantni kariotip sa recipročnom
translokacijom t;(1q-15q+) Atresia ani kod praseta
sa t;(1q-15q+)
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Aberantni kariotip
sa recipročnom
translokacijom
t;(4q+14q- ).
Fleksija falanga
praseta sa
recipročnom
translokacijom
t;(4q+14q- ).
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Aberantni kariotip (G-band) sa
Robertsonovom translokacijom
Rb.(14/15).
Raskre~enost praseta sa
Rb.(14/15).
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Aberantni kariotip sa
Robertsonovom
translokacijom
Prase sa hidrocefalusom u
čijem je kariotipu identifikovana
Robertsonova translokacija
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Apodno,
avitalno prase
Avitalno prase sa
malformacijom
“Kiklop”
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U periodu između dve ćelijske deobe (interfaza) hromozomi su u
relativno dekondenzovanom stanju, tako da su omogućeni procesi
transkripcije i translacije. Sintezom specifičnih proteina ostvaruje se
karakterističan izgled i funkcionisanje ćelije. Pored toga, u interfazi
dolazi do replikacije DNK, što predstavlja jedan od osnovnih
preduslova da se ćelija kasnije podeli. Nakon replikacije svaki
hromozom ima dve sestrinske hromatide, a svaka od njih sadrži isti
molekul DNK.
Za vreme deobe ćelije, hromozomi se prevode u maksimalno
kondenzovan oblik pri čemu svaki hromozom sadrži dva identična
molekula DNK u svojim sestrinskim hromatidama. Visok stepen
kondenzacije DNK i proteina u metafaznim hromozomima neophodan
je radi ravnomerne podele naslednog materijala. Velika količina DNK
u eukariotskim genomima stvorila je potrebu za evolutivnim
postankom kompleksno građenih hromozoma i ćeljskog ciklusa.
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Šematski prikaz ćelijskog ciklusa
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Faze ćelijskog ciklusa
tipične ćelije sisara
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Šematski prikaz
osnovnih faza
deobe životinjske
ćelije
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Šematski prikaz deobnog vretena kod životinjskih ćelija
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b
a
c
1 a) ćelijski zid; b) citoplazma; c) jedro;
Mitoza somatskih
ćelija korenčića
crnog luka
1. INTERFAZA
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2
Mitoza somatskih
ćelija korenčića
crnog luka
2. PROFAZA
d) hromatin
d
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3
Mitoza somatskih
ćelija korenčića
crnog luka
3. METAFAZA
e) hromozomi u ekvatorijalnoj ravni; f) vlakna deobnog vretena;
e
f
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4
Mitoza somatskih
ćelija korenčića
crnog luka
4. ANAFAZA
g) interhromozomska vlakna deobnog vretena;
h) homologi hromozomi u razdvajanju;
h g
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5
Mitoza somatskih
ćelija korenčića
crnog luka
5. TELOFAZA
i) fragmoblast
i
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1
Mitoza somatskih
ćelija embriona
pastrmke
1. INTERFAZA
a) ćelijska membrana; b) citoplazma; c) jedro;
b a
c
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2
Mitoza somatskih
ćelija embriona
pastrmke
2. PROFAZA
d) hromatin
d
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3
e Mitoza somatskih
ćelija embriona
pastrmke
3. METAFAZA
e) hromozomi u ekvatorijalnoj ravni; f) aster;
e
f
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4
Mitoza somatskih
ćelija embriona
pastrmke
4. ANAFAZA
g) interhromozomska vlakna deobnog vretena;
h) homologi hromozomi u razdvajanju;
h
g
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5
Mitoza somatskih
ćelija embriona
pastrmke
5. TELOFAZA
i) konstrikciona brazda
i
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Ploidnost ćelije tokom mejoze i mitoze kod diploidne
vrste organizama
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HVALA NA PAŽNJI!!!