Method for producing high purity X-chromosome bearing and Y-chromosome bearing populations of spermatozoa
First Claim
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1. A method differentiating sperm cells comprising:
- establishing a fluid stream containing sperm cells with a flow cytometer;
orienting the sperm cells with respect to a detector, wherein the detector comprises a photomultiplier tube that has a lower limit of linear operation;
operating the photomultiplier tube at a voltage below the lower limit of linear operation though an altered photomultiplier controller, said altered photomultiplier controller being altered to operate the photomultiplier tube throughout a range of nearly 0 volts to below 400 volts;
detecting fluorescence having characteristics differentially responsive to sperm cell orientation to the photomultiplier tube;
converting the fluorescence having characteristics differentially responsive to sperm cell orientation into at least one signal containing sperm cell orientation information;
analyzing the sperm cell orientation information;
using an analyzer that is configured to analyze at least one signal from said photomultiplier tube operated at a voltage range of nearly 0 volts to below 400 volts to differentiate between X chromosome bearing sperm and Y chromosome bearing sperm; and
generating a population of viable X chromosome and/or a population of viable Y chromosome bearing sperm cells.
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Abstract
Isolated non-naturally occurring populations of spermatozoa (15) having high purity and technologies to differentiate spermatozoa (28) based on characteristics such as mass, volume, orientation, or emitted light including methods of analysis and apparatus such as beam shaping optics (30) and detectors (32).
343 Citations
11 Claims
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1. A method differentiating sperm cells comprising:
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establishing a fluid stream containing sperm cells with a flow cytometer; orienting the sperm cells with respect to a detector, wherein the detector comprises a photomultiplier tube that has a lower limit of linear operation;
operating the photomultiplier tube at a voltage below the lower limit of linear operation though an altered photomultiplier controller, said altered photomultiplier controller being altered to operate the photomultiplier tube throughout a range of nearly 0 volts to below 400 volts;detecting fluorescence having characteristics differentially responsive to sperm cell orientation to the photomultiplier tube; converting the fluorescence having characteristics differentially responsive to sperm cell orientation into at least one signal containing sperm cell orientation information; analyzing the sperm cell orientation information; using an analyzer that is configured to analyze at least one signal from said photomultiplier tube operated at a voltage range of nearly 0 volts to below 400 volts to differentiate between X chromosome bearing sperm and Y chromosome bearing sperm; and generating a population of viable X chromosome and/or a population of viable Y chromosome bearing sperm cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification