FGSC #3251

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Reporting Genes: chol-2 ad-8 lys-5 un-4 pan-2

Species: crassa

Allele: 47904(t) Y226M58 DS6-85 66204(t) Y153M96

Alternate Strain Number: 6025

Depositor: OMM

Linkage Group: VIL VIL VIL VIL VIR

Mating Type: A

Species Number: 10

Opposite Mating Type: 3252

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
chol-2	VIL. Left of nit-6 (6 to 8%) (812, PB). Requires choline (471). Also uses di- but not monomethylaminoethanol (468) (Fig. 12). Deficient in S-adenosylmethionine:phosphatidyl- monomethylethanolamine methyltransferase (222, 923, 924). Strains carrying the only allele, 47904t, are leaky on minimal medium at 22°C but not at 34°C (501). Phospholipid composition is abnormal on limiting choline (501). Growth is colonial on limiting supplement at 34°C and on minimal medium at 25°C.	VIL	B
lys-5	VIL. Right of cyt-2 (6%), aro-6 (3%), and cpl-1 (5 to 7%). Left of un-4 (2%) (1012, PB).Requires lysine. Partial response to glutaric acid (762). Lacks homocitrate synthase activity (464, 762) (Fig. 16). Some alleles such as 37402, called asco, are autonomous ascospore lethals or semilethals, resulting in mostly immature white spores (see reference 1012 for a photograph). Viability of the lys- spores is improved by long incubation (7). With other alleles such as DS6-85, ascospores blacken and germinate normally. Accumulates malate plus citrate on media with limiting lysine concentrations (464). Four complementation groups (12). Allele 37402 called asco.	VIL	B
pan-2	VIR. Right of rib-1 (<1 to 3%). Left of del (6%) and trp-2(11%) (140, 141, 143, 818, PB). Unable to convert ketovaline to ketopantoic acid (138, 140, 141). Used in major studies of intralocus recombination and complementation (140-143). pan-2ascospores remain white or pale if the crossing medium is not supplemented, even when the protoperithecial parent is pan-2+. Asci in which gene conversion has occurred at pan-2 can thus be recognized and isolated (1072, 1073); photographs (1072). For good recovery of pan-2progeny, crossing media should be supplemented with pantothenic acid (10 µg/ml) even when the protoperithecial parent is pan+. Called group B.	VIR	B
un-4	VIL. Right of lys-5 (2%). Left of T(T39M777) and cys-2(4%) (808, 1012). (482). Unknown function. Heat sensitive, 34°C versus 25°C (481). Formerly called un(66204).	VIL	B
ad-8	VIL. Right of ser-6 (15%) and het-8 (12%). Left of aro-6 (8%) and cpl-1(6 to 11%) (437, 510, 730, PB). Requires adenine; cannot use hypoxanthine (526). Lacks adenylosuccinate synthase (511) (Fig. 8). Fine-structure mapping and intralocus complementation (510-512). Has little hypoxanthine uptake and little hypoxanthine phosphoribosyltransferase; both these effects are partly counteracted in ad-1 ad-8 double mutants (903). Little hypoxanthine phosphoribosyltransferase is also found in mep(3) and mep(10)mutants, q.v. Used to study purine transport (787, 903, and references therein). Called complementation group E.	VIL	B