biology

KBM-7 cells

KBM-7 cells is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand KBM-7 cells rather than just read about it. In short: KBM-7 cells are a chronic myelogenous leukemia (CML) cell line used for biomedical research. Like all cancer cell lines, it is immortal and can divide indefinitely.

Key takeaways

KBM-7 cells belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KBM-7 cells to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KBM-7 cells from memory before moving on to harder problems.

Reference excerpt

KBM-7 cells are a chronic myelogenous leukemia (CML) cell line used for biomedical research. Like all cancer cell lines, it is immortal and can divide indefinitely. A unique aspect of the KBM-7 cell line is that it is near-haploid, meaning it contains only one copy for most of its chromosomes. Human chromosomes are typically diploid, meaning that there are two copies of each chromosome.

Origin KBM-7 cells were derived from a 39-year-old man with chronic myeloid leukemia in blast crisis. The original cell line contained both near haploid and hyperdiploid clones. Subsequent subcloning yielded a pure near-haploid cell line (subclone P1-55). Genome analysis has revealed that besides the disomic chromosome 8, a 30 megabase fragment of chromosome 15 is present in two copies. Like other CML cells lines (e.g., K562) KBM-7 cells are positive for the Philadelphia chromosome harboring the BCR-ABL oncogenic fusion.

Karyotype Subclone P1-55 has been described as having a karyotype of "25,XY,+8,Ph(+)", meaning that it has 25 chromosomes, including one copy of everything from 1–22, X, and Y,an extra copy of 8, and that it has the Philadelphia rearrangement. Under International System for Human Cytogenomic Nomenclature rules of 2024, this should be written 25,X,+Y,t(9;22)(q34;q11). Taking into account other known variations, the full karyotype is ish 25,X,+Y,+8,t(9;22)(q34;q11),ins(19;15)(p13.1;q22q25). seq inv(12)(12q14.2), arr[GRCh37] 8×2,15q(61109318_89880624)×2,11p(46442526_46578400)×0. This notation describes the insertion of a part of Chr 15 onto chromosome 19; an inversion on Chr 12 detected by sequencing (affecting PPM1H and SRGAP1); duplication of Chr 8 and a part of Chr 15 detected by microarray; and deletion of a part Chr 11 detected by microarray (including AMBRA1). Loss of the Y chromosome frequently happens.

Derived cell lines KBM-7 cells have been reprogrammed to yield the HAP1 cell line. It has a fibroblast-like phenotype, expresses no blood cell markers, and has lost the extra copy of Chr 8 and the only copy of Chr Y.

Cultivation and applications KBM-7 cells grow in suspension and are maintained in Iscove's Modified Dulbecco's Medium (IMDM) supplemented with 10% fetal bovine serum. They divide approximately every 24 hours. KBM-7 has found applications in a variety of genomic research studies; the cell line has been examined in gene silencing experiments, been reprogrammed to become a stem cell line, and served as a test model for novel drug candidates.

Significance One method of studying gene function involves "knocking out" the gene by inducing a mutation. This causes the resulting gene product to be nonfunctional, and researchers can then see how this effects the cell's function as a whole. Many gene editing procedures have very low efficiency, and often both copies of mammalian chromosomes must be knocked out in order to see a phenotypic effect. Having a near-haploid cell line such as KBM-7 greatly increases the efficiency of these studies because there is only one gene that must be knocked out.

References

External links Cellosaurus entry for KBM-7

Worked examples

Example 1 — a first encounter with KBM-7 cells

Start with the simplest possible case. Write down what KBM-7 cells claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to KBM-7 cells before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about KBM-7 cells ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of KBM-7 cells

In research: KBM-7 cells appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses KBM-7 cells in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: KBM-7 cells is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cancer cell lines, Human cell lines, Leukemia cell lines, so understanding it makes those chapters shorter.
In everyday life: Look for KBM-7 cells outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study KBM-7 cells in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KBM-7 cells means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain KBM-7 cells out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KBM-7 cells in simple terms?

KBM-7 cells are a chronic myelogenous leukemia (CML) cell line used for biomedical research. Like all cancer cell lines, it is immortal and can divide indefinitely.

Why does KBM-7 cells matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study KBM-7 cells?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on KBM-7 cells.