FGSC #4143

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Reporting Genes: thi-3 met-7 nt

Species: crassa

Allele: 18558 4894 65001

Alternate Strain Number: M670 A

Depositor: EK

Linkage Group: VIIL VIIR

Mating Type: A

Species Number: 10

Opposite Mating Type: 4144

ref1: Kafer 1982. Neurospora Newsl. 29:41-44, https://doi.org/10.4148/1941-4765.1645

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
met-7	VIIR. Right of qa-2 (<1%), ars (<1%), and the centromere (one second-division ascus in several hundred). Left of met-9 (10[-4]) and wc-1 (1 to 4%) (146, 725; M.E. Case, personal communication). (718; M.K. Allen, cited in references 718 and 789) Uses cystathionine, homocysteine, or methionine (718; N. H. Horowitz, cited in reference 1180). Lacks cystathionine-gamma-synthase (547) (Fig. 17). This enzyme is also lacking in the mutant met-3 (547). See met-3 for regulation. Apparently contiguous with met-9by coconversion. Flanking markers are recombined in most met-7+ met-9+ recombinants (725). Functionally distinct from the mutant met-9, which has active cystathionine-gamma-synthase (547) but cannot use homocysteine. No mutants lacking both functions have been isolated. Allele NM251 is suppressible by supersuppressor RN33 (same as ssu-1?) (725). Allele K79 is inseparable from reciprocal translocation T(I;VII)K79 (808).	VIIR	B
nt	VIIR. Between arg-10 (2 to 12%) and sk (7 to 18%) (789). (874) Uses nicotinic acid. May respond also to tryptophan, phenylalanine, tyrosine, quinic acid, and precursors of nicotinic acid or tryptophan, or both, depending on genetic background (448, 760). Best supplemented with nicotinamide and scored as a nic mutant. Probably deficient in tryptophan pyrrolase (tryptophan 2,3-dioxygenase) (Fig. 18), but direct evidence is lacking because tryptophan oxygenase cannot be assayed in Neurospora (368). Kynurenine formamidase levels are normal (368). Pyridine nucleotide levels (111).	VIIR	B
thi-3	VIIL. Between nic-3 (9 to 18%) and T(T54M50) (808, 812, 816). (482). Uses thiamine or thiazole (1059). Does not undergo growth adaptation on minimal medium. Growth on minimal medium is leaky at first, but becomes tight with exhaustion of endogenous thiazole (302), so scoring is best done late.	VIIL	B