Expression system for human brain-specific voltage-gated sodium channel, type 1
First Claim
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1. An isolated and modified human sodium channel type 1 alpha subunit (SCN1A) nucleic acid molecule comprising:
- (a) a nucleotide sequence comprising the nucleotide sequence of SEQ ID NO;
1 comprising one or more mutations within nucleotides 1203–
1209;
or(b) a nucleotide sequence at least about 95% identical to SEQ ID NO;
1, and further comprising one or more mutations within nucleotide positions corresponding to nucleotides 1203–
1209 of SEQ ID NO;
1wherein the nucleotide sequences of (a) and (b) encode an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation.
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Abstract
Isolated nucleic acids encoding human SCN1A polypeptides, recombinantly expressed and isolated human SCN1A polypeptides, heterologous expression systems for recombinant expression of human SCN1A polypeptides, assay methods employing the same, and methods and compositions for modulation of sodium channel function.
28 Citations
31 Claims
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1. An isolated and modified human sodium channel type 1 alpha subunit (SCN1A) nucleic acid molecule comprising:
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(a) a nucleotide sequence comprising the nucleotide sequence of SEQ ID NO;
1 comprising one or more mutations within nucleotides 1203–
1209;
or(b) a nucleotide sequence at least about 95% identical to SEQ ID NO;
1, and further comprising one or more mutations within nucleotide positions corresponding to nucleotides 1203–
1209 of SEQ ID NO;
1wherein the nucleotide sequences of (a) and (b) encode an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation.
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2. An isolated and modified human sodium channel type 1 alpha subunit (SCN1A) nucleic acid molecule comprising:
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(a) a nucleic acid molecule comprising a nucleotide sequence of SEQ ID NO;
3;
or(b) a nucleic acid molecule at least about 95% identical to SEQ ID NO;
3, and wherein the nucleic acid molecule comprises a T to C transition at each of the nucleotide positions corresponding to nucleotides 1206 and 1209 of SEQ ID NO;
3 and encodes an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation.
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3. An isolated host cell for heterologous expression of a human sodium channel type 1 alpha subunit (SCN1A) polypeptide, the host cell comprising:
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(a) a polypeptide encoded by a nucleic acid molecule comprising a nucleotide sequence of SEQ ID NO;
1 comprising one or more mutations within nucleotides 1203–
1209;
or(b) a polypeptide encoded by a nucleic acid molecule at least about 95% identical to SEQ ID NO;
1 and further comprising one or more mutations within nucleotide positions corresponding to nucleotides 1203–
1209 of SEQ ID NO;
1wherein the polypeptides of (a) and (b) each comprise an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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4. An isolated host cell for heterologous expression of a human sodium channel type 1 alpha subunit (SCN1A) polypeptide, the host cell comprising:
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(a) a polypeptide encoded by a nucleic acid molecule comprising a nucleotide sequence of SEQ ID NO;
3;
or(b) a polypeptide that regulates Na+ ion membrane permeation, which is encoded by a nucleic acid molecule at least about 95% identical to SEQ ID NO;
3, and wherein the nucleic acid molecule comprises a T to C transition at each of the nucleotide positions corresponding to nucleotides 1206 and 1209 of SEQ ID NO;
3.
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13. An isolated host cell for heterologous expression of a recombinant human sodium channel type 1 alpha subunit (SCN1A) polypeptide, the host cell comprising a construct comprising:
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(a) a nucleotide sequence comprising the nucleotide sequence of SEQ ID NO;
1 that comprises one or more mutations within nucleotides 1203–
1209;
or(b) a nucleotide sequence at least about 95% identical to SEQ ID NO;
1, and further comprising one or more mutations within nucleotide positions corresponding to nucleotides 1203–
1209 of SEQ ID NO;
1wherein the nucleotide sequences of (a) and (b) encode an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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14. An isolated host cell for heterologous expression of a recombinant human sodium channel type 1 alpha subunit (SCN1A) polypeptide, the host cell comprising a construct comprising:
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(a) a nucleic acid molecule comprising a nucleotide sequence of SEQ ID NO;
3;
or(b) a nucleic acid molecule at least about 95% identical to SEQ ID NO;
3, and wherein the nucleic acid molecule comprises a T to C transition at each of the nucleotide positions corresponding to nucleotides 1206 and 1209 of SEQ ID NO;
3 and encodes an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation.
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23. A method for identifying a sodium channel modulator, the method comprising:
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(a) providing a heterologous expression system whereby a human SCN1A polypeptide is expressed from a modified SCN1A nucleic acid molecule in a host cell, wherein the nucleic acid molecule encoding a human SCN1A polypeptide comprises; (1) a nucleotide sequence comprising the nucleotide sequence of SEQ ID NO;
1 comprising one or more mutations within nucleotides 1203–
1209;
or(2) a nucleotide sequence at least 95% identical to SEQ ID NO;
1, and further comprising one or more mutations within nucleotide positions corresponding to nucleotides 1203–
1209 of SEQ ID NO;
1;
or(3) a nucleotide sequence of SEQ ID NO;
3;
or(4) a nucleotide sequence at least 95% identical to SEQ ID NO;
3, and wherein the nucleic acid molecule comprises a T to C transition at each of the nucleotide positions corresponding to nucleotides 1206 and 1209 of SEQ ID NO;
3, wherein the nucleotide sequences of (1), (2), (3), and (4) encode an SCN1A voltage-gated sodium channel polypeptide that regulates Na+ ion membrane permeation;(b) providing a test substance to the system of (a); (c) assaying sodium channel conductance in the presence of the test substance; (d) comparing sodium channel conductance in the presence of the test substance with sodium channel conductance in the absence of the test compound; and (e) identifying a test substance as a sodium channel modulator by measuring an increase or decrease in sodium channel conductance in the presence of the test substance as compared to sodium channel conductance in the absence of the test substance. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification