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LEUCISM & VITILIGO: Evidence of Big DNA Changes in ALL FORMS OF LIFE On Earth QUANTUM Mandela Effect
LEUCISM & VITILIGO: Evidence of Big DNA Changes in ALL FORMS OF LIFE On Earth QUANTUM Mandela Effect
Published: 2017/09/28
Channel: Affected Collective
What is LEUCISM? What does LEUCISM mean? LEUCISM meaning, definition & explanation
What is LEUCISM? What does LEUCISM mean? LEUCISM meaning, definition & explanation
Published: 2017/11/15
Channel: The Audiopedia
10  Incredible Albino and Leucistic Animals
10 Incredible Albino and Leucistic Animals
Published: 2015/10/21
Channel: WatchZozo
Top 5: Albino & Leucistic Animals
Top 5: Albino & Leucistic Animals
Published: 2016/03/05
Channel: STORYTRENDER by Caters TV
WHITE LION: real & rare example of genetic anomaly (leucism not albinoism)
WHITE LION: real & rare example of genetic anomaly (leucism not albinoism)
Published: 2015/07/13
Channel: Datacube: awesome facts and interesting top lists
35 Incredible Albino ( and Leucistic  ) Animals
35 Incredible Albino ( and Leucistic ) Animals
Published: 2017/04/14
Channel: TopTenList
Leucistic vs Albino Boa Constrictor
Leucistic vs Albino Boa Constrictor
Published: 2016/02/09
Channel: Muscle Serpents University
Leucistic Sugar Glider Surprise
Leucistic Sugar Glider Surprise
Published: 2016/02/20
Channel: Deadly Tarantula Girl
Leucism or Partially Albino Hummingbird!
Leucism or Partially Albino Hummingbird!
Published: 2016/08/17
Channel: MagniloquentlyPuncturedKeyboard or MPK
Amsel mit Leuzismus / blackbird with leucism
Amsel mit Leuzismus / blackbird with leucism
Published: 2011/10/10
Channel: Flatterman Island
Rare White Spotted Nurse Shark (Leucism)
Rare White Spotted Nurse Shark (Leucism)
Published: 2016/09/29
Channel: Nate Madden
Leucism - Albino robin ?
Leucism - Albino robin ?
Published: 2016/02/16
Channel: sketchart photo
Albino Alligator Vs. Leucistic Alligator
Albino Alligator Vs. Leucistic Alligator
Published: 2015/08/12
Channel: theTurtleRoom
The White (Leucistic) Cobra
The White (Leucistic) Cobra
Published: 2014/10/05
Channel: Snake Charmer
leucistic cardinal - Most beautiful bird in WORLD
leucistic cardinal - Most beautiful bird in WORLD
Published: 2016/12/02
Channel: Video clip
Leucistic VS Wild Type Indian Peacock Joust
Leucistic VS Wild Type Indian Peacock Joust
Published: 2013/03/08
Channel: Melvin Wei
Leucistic White Baby Sea Turtle
Leucistic White Baby Sea Turtle
Published: 2014/10/15
Channel: GetGreenBeWell
Blue Eyed Leucistic Male does live kill
Blue Eyed Leucistic Male does live kill
Published: 2015/10/24
Channel: Kato 忍者
The Mystery Of The Part White Blackbirds (leucism)
The Mystery Of The Part White Blackbirds (leucism)
Published: 2017/05/13
Channel: HelenaMikas
Super Rare Leucistic White Alligator in 4K UHD - by John D. Villarreal
Super Rare Leucistic White Alligator in 4K UHD - by John D. Villarreal
Published: 2016/01/05
Channel: Conservative New Media
Piebald Fox Squirrel Leucism Albino Fur
Piebald Fox Squirrel Leucism Albino Fur
Published: 2017/04/14
Channel: twredo
Morph of the Day #8 (Blue Eyed Leucistic)
Morph of the Day #8 (Blue Eyed Leucistic)
Published: 2017/03/31
Channel: Josh C
Unboxing blue eyed leucistic columbian rainbow boas
Unboxing blue eyed leucistic columbian rainbow boas
Published: 2017/09/21
Channel: Mason's World
Leucism and Albinism in American Robins
Leucism and Albinism in American Robins
Published: 2013/11/18
Channel: Guelph Arboretum
Albino? Hypomelanistic? Leucistic? African Dwarf Frogs Do Exist
Albino? Hypomelanistic? Leucistic? African Dwarf Frogs Do Exist
Published: 2011/06/07
Channel: Aquarimax
Tal
Tal'ngai the Leucistic Grey-headed flying-fox.
Published: 2017/07/13
Channel: Janine Davies
Blackbird (Leucism) Territorial Male Behaviour
Blackbird (Leucism) Territorial Male Behaviour
Published: 2017/03/30
Channel: Hyndburn Butterfly Project
Leucistic Bald Eagle in Klamath
Leucistic Bald Eagle in Klamath
Published: 2015/02/28
Channel: Renae Tolbert
Leucistic Crow
Leucistic Crow
Published: 2016/11/13
Channel: Ray H
Leucism
Leucism
Published: 2016/10/31
Channel: BloodSugarLQ
I
I'm A Leucistic Raccoon
Published: 2010/08/06
Channel: timdonderevo
Kos cerny s leucismem5 Turdus merula Blackbird with leucism Adolf Goebel
Kos cerny s leucismem5 Turdus merula Blackbird with leucism Adolf Goebel
Published: 2017/04/08
Channel: MOS ČSO
Mississauga: Turkey Vulture with leucism in flight 4-18-2016
Mississauga: Turkey Vulture with leucism in flight 4-18-2016
Published: 2016/04/20
Channel: The 4K Guy - Urban / Nature / Editorial
How to say "leucism"! (High Quality Voices)
How to say "leucism"! (High Quality Voices)
Published: 2017/02/09
Channel: WordBox
Tal
Tal'ngai Dha'run - Leucistic Grey-headed flying fox
Published: 2017/06/22
Channel: Janine Davies
White Tiger (Panthera tigris tigris) with leucism
White Tiger (Panthera tigris tigris) with leucism
Published: 2013/05/29
Channel: The Nature Box
LEUCISM IN 2 BIRD SPECIES FILMED FEEDING TOGETHER
LEUCISM IN 2 BIRD SPECIES FILMED FEEDING TOGETHER
Published: 2008/11/23
Channel: PYTHAGORAS101
How to Pronounce Leucism
How to Pronounce Leucism
Published: 2013/01/24
Channel: Emma Saying
Leucistic Turdus pilaris - (Fieldfare, Björktrast) - bathing
Leucistic Turdus pilaris - (Fieldfare, Björktrast) - bathing
Published: 2015/06/04
Channel: JHIslander Islander
How To Pronounce Leucism
How To Pronounce Leucism
Published: 2017/09/09
Channel: Emma Saying
白いヒドリガモ  Wigeon (Leucism)
白いヒドリガモ  Wigeon (Leucism)
Published: 2013/02/12
Channel: Birdlover.jp
Kavka obecna leucismus Corvus monedula Jackdaw with leucism Adolf Goebel
Kavka obecna leucismus Corvus monedula Jackdaw with leucism Adolf Goebel
Published: 2015/10/30
Channel: MOS ČSO
My blue-eyed leucistic ball pythons second feeding
My blue-eyed leucistic ball pythons second feeding
Published: 2016/02/11
Channel: Bronx Snake Keeper
leuci2 | leucistic two times [7.26.17]
leuci2 | leucistic two times [7.26.17]
Published: 2017/07/27
Channel: gwennie2006
Khaleesi
Khaleesi's Arrival (Blue Eyed Leucistic Ball Python) UNBOXING & FEEDING!!
Published: 2017/05/27
Channel: Dove Sessions
Leucistic eel
Leucistic eel
Published: 2017/06/19
Channel: Vincent Wu
How to Pronounce Leucism
How to Pronounce Leucism
Published: 2012/12/25
Channel: Emma Saying
Rehab | Rare Leucistic Bat baby, orphaned rescued, Megabat Grey-headed male, Flying-fox, Fruit bat
Rehab | Rare Leucistic Bat baby, orphaned rescued, Megabat Grey-headed male, Flying-fox, Fruit bat
Published: 2017/07/27
Channel: Megabats Microbats
Red tailed Hawk aberrant LEUCISTIC plumage; by Lucio Fazio, Peel, Ont; Nov 2017
Red tailed Hawk aberrant LEUCISTIC plumage; by Lucio Fazio, Peel, Ont; Nov 2017
Published: 2017/11/13
Channel: PeregrineFalcon1918
How To Pronounce Leucism
How To Pronounce Leucism
Published: 2017/09/13
Channel: Emma Saying
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WIKIPEDIA ARTICLE

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Leucistic white lions owe their colouring to a recessive allele. Note the eyes and lips remain the normal colour.
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 (/ˈljuːkɪzəm/;[1] or /ˈlsɪzəm/[2][3]) is a condition in which there is partial loss of pigmentation in an animal resulting in white, pale, or patchy coloration of the skin, hair, feathers, scales or cuticle, but not the eyes.[1] Unlike albinism, it is caused by a reduction in multiple types of 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[4] and the ball python[5] 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, those affected by albinism 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,[6] mitf[7] and EDNRB.[8]

Etymology[edit]

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

Examples in nature[edit]

Leucism has been noted in a number of animal species, including:

Examples in fiction and mythology[edit]

Gallery[edit]

See also[edit]

References[edit]

  1. ^ a b "leucism". The American Heritage Dictionary of the English Language (5th ed.). Boston: Houghton Mifflin Harcourt. 2014. 
  2. ^ "leucistic". Oxford Dictionaries. Oxford University Press. Retrieved January 9, 2016. 
  3. ^ Merriam-Webster, Merriam-Webster's Unabridged Dictionary, Merriam-Webster, (Subscription required (help)). 
  4. ^ White crows at Cornell University.
  5. ^ Piebald ball pythons at Constrictors.com (archived 9 October 2006, from the original, accessed 18–22 July 2006).
  6. ^ Coat colour, dominant white at Online Mendelian Inheritance in Animals.
  7. ^ 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.
  8. ^ Waardenburg syndrome at Atlas of Genetics and Cytogenetics in Oncology and Haematology (archived 26 December 2005, from the original, accessed 18–22 July 2006).
  9. ^ Johnson, Thomas (14 September 2017). "Rare white giraffes spotted in Kenya". Washington Post. Retrieved 31 December 2017. 

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