How to Pronounce Leucism

Channel: EmmaSaying   |   2013/01/24
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1
How to Pronounce Leucism
How to Pronounce Leucism
::2013/01/24::
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2
Leucism and Albinism in American Robins
Leucism and Albinism in American Robins
::2013/11/18::
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Kos cerny s leucismem2 Turdus merula Blackbird with leucism Adolf Goebel
Kos cerny s leucismem2 Turdus merula Blackbird with leucism Adolf Goebel
::2014/03/02::
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Amsel mit Leuzismus / blackbird with leucism
Amsel mit Leuzismus / blackbird with leucism
::2011/10/10::
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Vit duva. Albino / Leucism fågel.
Vit duva. Albino / Leucism fågel.
::2014/02/04::
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White Tiger (Panthera tigris tigris with leucism) [Stock footage]
White Tiger (Panthera tigris tigris with leucism) [Stock footage]
::2013/05/29::
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白化鷹斑鷸 Wood Sandpiper(Leucism)
白化鷹斑鷸 Wood Sandpiper(Leucism)
::2014/01/26::
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White mallards by leucism
White mallards by leucism
::2013/08/18::
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白変種ホオジロ♂囀り・鳴き声(leucism)(Meadow Bunting・Emberiza cioides)(song)
白変種ホオジロ♂囀り・鳴き声(leucism)(Meadow Bunting・Emberiza cioides)(song)
::2011/07/25::
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How to Pronounce Leucism
How to Pronounce Leucism
::2012/12/25::
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LEUCISM IN 2 BIRD SPECIES FILMED FEEDING TOGETHER
LEUCISM IN 2 BIRD SPECIES FILMED FEEDING TOGETHER
::2008/11/23::
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白いヒドリガモ  Wigeon (Leucism)
白いヒドリガモ  Wigeon (Leucism)
::2013/02/12::
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Kos cerny sber potravy Turdus merula Blackbird with leucism Adolf Goebel
Kos cerny sber potravy Turdus merula Blackbird with leucism Adolf Goebel
::2012/07/25::
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Leucistic Greenfinch - Verdier d
Leucistic Greenfinch - Verdier d'Europe - Canto de Verderon
::2012/02/01::
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Leucistic Greenfinch - Pied Greenfinch - Verdier d
Leucistic Greenfinch - Pied Greenfinch - Verdier d'Europe - Canto de Verderon
::2012/07/17::
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LEUCISTIC BALL PYTHON FEMALE-beautiful snake
LEUCISTIC BALL PYTHON FEMALE-beautiful snake
::2012/03/19::
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白子小鸊鵜(Little Grebe of Leucistic)
白子小鸊鵜(Little Grebe of Leucistic)
::2014/03/08::
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Leucistic Robin
Leucistic Robin
::2014/03/12::
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Zoo Tycoon (Xbox One) | The Final Episode | Pseudo Melanistic Leucistic Albino Bleeeeeeh.
Zoo Tycoon (Xbox One) | The Final Episode | Pseudo Melanistic Leucistic Albino Bleeeeeeh.
::2013/12/18::
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20
White Screech Owl - Lucistic, Albino, or Ino ? Update to
White Screech Owl - Lucistic, Albino, or Ino ? Update to 'White Owl - Leucistic Baby Screech Owl"
::2013/08/28::
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White Owl - Leucistic Baby Screech Owl
White Owl - Leucistic Baby Screech Owl
::2013/05/12::
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Possum Posse - Three Mugs and a Bug in Mealtime Madness
Possum Posse - Three Mugs and a Bug in Mealtime Madness
::2013/09/17::
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Possum Posse - Three Mugs and a Bug in the Tub
Possum Posse - Three Mugs and a Bug in the Tub
::2013/09/17::
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24
White-headed (Leucistic) Golden Plover
White-headed (Leucistic) Golden Plover
::2012/10/30::
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Leucistic Neotropical Otter in Costa Rica
Leucistic Neotropical Otter in Costa Rica
::2013/03/27::
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I
I'm A Leucistic Raccoon
::2010/08/06::
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27
Microattention: Leucistic Pied American Robin Foraging
Microattention: Leucistic Pied American Robin Foraging
::2013/05/30::
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One of TWO WHITE EASTERN GREY KANGAROOS at Yering Gorge Cottages
One of TWO WHITE EASTERN GREY KANGAROOS at Yering Gorge Cottages
::2014/02/08::
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29
Leucistic alligator gar at the Tennessee Aquarium
Leucistic alligator gar at the Tennessee Aquarium
::2012/05/08::
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30
White / albino / leucistic Squirrel Caught On Camera!!
White / albino / leucistic Squirrel Caught On Camera!!
::2013/01/04::
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31
Leucistic fur seal holds a territory.
Leucistic fur seal holds a territory.
::2009/06/10::
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Leucistic Snakehead: Close-Up View (2 Apr 2014)
Leucistic Snakehead: Close-Up View (2 Apr 2014)
::2014/04/02::
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"Momo" the Leucistic Axolotl GFP
"Momo" the Leucistic Axolotl GFP
::2012/03/04::
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Leucistic White-throated Sparrow
Leucistic White-throated Sparrow
::2008/09/17::
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White Squirrels (non-albino)
White Squirrels (non-albino)
::2014/01/25::
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Leucistic Eurasian Collared Dove wandering around my yard
Leucistic Eurasian Collared Dove wandering around my yard
::2012/05/29::
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Leucistic Repoll, Strath Brora
Leucistic Repoll, Strath Brora
::2010/11/17::
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leucistic robin
leucistic robin
::2013/07/09::
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Leucistic American Robin
Leucistic American Robin
::2012/02/27::
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WHITE FEMALE SATIN BOWERBIRD ,VERY RARE .IS THIS A NEW SPECIES OR IS IT ALBINO ????
WHITE FEMALE SATIN BOWERBIRD ,VERY RARE .IS THIS A NEW SPECIES OR IS IT ALBINO ????
::2008/09/29::
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Leucistic Chickadee Eating Seed - Feb 2 2011
Leucistic Chickadee Eating Seed - Feb 2 2011
::2012/10/03::
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Large Male Indian Tiger (Panthera tigris tigris)
Large Male Indian Tiger (Panthera tigris tigris)
::2011/10/05::
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43
I have a bird with a white ring... asked @faithos #AskBillOddie
I have a bird with a white ring... asked @faithos #AskBillOddie
::2012/02/21::
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44
Eagle at Shasta Dam in Shasta Lake Flies With Fish
Eagle at Shasta Dam in Shasta Lake Flies With Fish
::2013/08/09::
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REAL Strange/Mutated/Rare Creatures
REAL Strange/Mutated/Rare Creatures
::2008/08/05::
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Pied Robin
Pied Robin
::2012/04/23::
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Blackbird - Svartþröstur - Fuglar - Söngfugl - Svarttrast -  Solsort -  Koltrast
Blackbird - Svartþröstur - Fuglar - Söngfugl - Svarttrast - Solsort - Koltrast
::2012/04/10::
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Blauer + Weißer Pfau Pavo Cristatus im Schlosspark Eggenberg Österreich
Blauer + Weißer Pfau Pavo Cristatus im Schlosspark Eggenberg Österreich
::2011/09/25::
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Kos cerny s leucismem_Turdus merula_Blackbird with leucism_Adolf Goebel.avi
Kos cerny s leucismem_Turdus merula_Blackbird with leucism_Adolf Goebel.avi
::2012/01/21::
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WHITE PENGUIN! Extremely rare, totally white emperor chick
WHITE PENGUIN! Extremely rare, totally white emperor chick
::2007/09/30::
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From Wikipedia, the free encyclopedia
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White lions owe their colouring to a recessive allele.
All-white dominant white horse with pink skin, brown eyes, and white hooves.
This white horse owes its colouring to a dominant allele (dominant white).
A leucistic Rock Pigeon. Both the eyes and legs are still of the normal colour.

Leucism /ˈljsɪzəm/[1] is a condition in animals characterized by reduced pigmentation. Unlike albinism, it is caused by a reduction in all types of skin pigment, not just melanin.

Details[edit]

(video) A tiger with leucism at Tobu Zoo, in Saitama, Japan.

Leucism (occasionally spelled leukism) is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural crest to skin, hair, or feathers during development. This results in either the entire surface (if all pigment cells fail to develop) or patches of body surface (if only a subset are defective) having a lack of cells capable of making pigment.

Since all pigment cell-types differentiate from the same multipotent precursor cell-type, leucism can cause the reduction in all types of pigment. This is in contrast to albinism, for which leucism is often mistaken. Albinism results in the reduction of melanin production only, though the melanocyte (or melanophore) is still present. Thus in species that have other pigment cell-types, for example xanthophores, albinos are not entirely white, but instead display a pale yellow colour.

More common than a complete absence of pigment cells is localized or incomplete hypopigmentation, resulting in irregular patches of white on an animal that otherwise has normal colouring and patterning. This partial leucism is known as a "pied" or "piebald" effect; and the ratio of white to normal-coloured skin can vary considerably not only between generations, but between different offspring from the same parents, and even between members of the same litter. This is notable in horses, cows, cats, dogs, the urban crow[2] and the ball python[3] but is also found in many other species.

A further difference between albinism and leucism is in eye colour. Due to the lack of melanin production in both the retinal pigmented epithelium (RPE) and iris, albinos typically have red eyes due to the underlying blood vessels showing through. In contrast, most leucistic animals have normally coloured eyes. This is because the melanocytes of the RPE are not derived from the neural crest, instead an outpouching of the neural tube generates the optic cup which, in turn, forms the retina. As these cells are from an independent developmental origin, they are typically unaffected by the genetic cause of leucism.

Genes that, when mutated, can cause leucism include, c-kit,[4] mitf[5] and EDNRB.[6]

Etymology[edit]

The terms leucistic and leucism are derived from medical terminology. The stem leuc- is the Latin variant of leuk- from the Greek leukos meaning "white" (see Steadman’s, Dorland’s or Taber’s medical dictionaries).

Gallery[edit]

See also[edit]

References[edit]

  1. ^ "leucistic". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. 
  2. ^ White crows at Cornell University.
  3. ^ Piebald ball pythons at Constrictors.com.
  4. ^ Coat colour, dominant white at Online Mendelian Inheritance in Animals.
  5. ^ An L1 element intronic insertion in the black-eyed white (Mitf[mi-bw]) gene: the loss of a single Mitf isoform responsible for the pigmentary defect and inner ear deafness at Human Mulecular Genetics.
  6. ^ Waardenburg syndrome at Atlas of Genetics and Cytogenetics in Oncology and Haematology.
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