FGSC #3020

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Reporting Genes: his-2;pdx-1 mtr

Species: crassa

Allele: Y152M43;37803 119(r)

Alternate Strain Number: hpm 119sA

Mutagen: UV

Depositor: DRS

Linkage Group: IR;IVR IVR

Mating Type: A

Species Number: 10

Genetic Background: M

ref1: Stadler/Kariya Genetics 63:291-316 1969, https://doi.org/10.1093/genetics/63.2.291

Deposit Sheet ↗

Genes

Locus	Cultural Requirements	Link Group	Type
pdx-1	IVR. Right of pyr-1 (<1 to 10%). Left of T(S1229) and pt (2%) (40, 55, 692, 808). (482) Uses pyridoxine, pyridoxal, or pyridoxamine (843, 845, 846). Shows intralocus complementation (845, 846) and recombination (848), Provided the first proven example of gene conversion (686). Scoring is sharpened by addition of 100 mg of desoxypyridoxine per liter (845). Several alleles (called pdxp: e.g., 44602) are pH sensitive and can grow without pyridoxine on medium containing ammonium ions at a pH above 6 (1029). Conidia are subject to death by unbalanced growth on minimal medium (1033). A yellow pigment is excreted under certain conditions by the pdx-1;En(pdx) double mutant; see En(pdx). Allele 44204 originally called pdx-2 (see reference 848).	IVR	B
his-2	IR. Right of T(AR190) and un-2 (<1%). Left of the T(AR173) right breakpoint and of nuc-1 (<1%) (172, 670, 808). (434)Requires histidine (434). Affects adenosine 5'-triphosphate phosphoribosylpyrophosphate pyrophosphorylase (16) (Fig. 14). Intralocus complementation (162). Recombination between his-2 alleles is controlled by rec-3(173); it is not affected by rec-1 (172). Initial his-2 allele called C94.	IR	B
mtr	IVR. Between pdx-1 (2%) and col-4 (1%) (101, 1017).Resistant to 4-methyltryptophan and p-fluorophenylalanine. pmn (= Pm-N, pm n), selected by resistance to p-fluorophenylalanine, has been shown to be alletic with mtr(R. Sadler and S. Ogilvie-Villa, personal communication; see also reference 248). Defective in transport of neutral aliphatic and aromatic amino acids via amino acid transport system I (as defined in reference 777) (248, 602, 1017, 1152). Causes an alteration in surface glycoproteins (1038). Used extensively for transport studies (247a, 1150 [review], 1152), also for studies of the mechanism of intralocus recombination (1021). Resistance is recessive in duplications from T(S1229) (PB). Recessive resistance used in a heterokaryon test system for mutation studies (1020). Suppressors obtained and used for selecting other resistance mutants (106, 107, 555, 1018). Allele 26 is a putative frameshift mutation reverted by ICR170 (106, 107). mtrascospores are slow to darken and mature; up to 50% of the young ascospores from heterozygous crosses are white (152, PB). With probable allele MN18, ascospore viability is improved by the addition of peptone to the crossing medium when the male parent is added (152). mtr has been scored on media containing 10 or 70 µg of filter-sterilized 4-methyltryptophan per ml or on 20 or 60 µg of p-fluorophenylalanine per ml (550, 1021, PB). Unlike 4-methyltryptophan, p-fluorophenylalanine is heat stable and can be added before autoclaving. Strains with mutations at the mtr locus may be obtained by selection for resistance to numerous agents or for defects in uptake ability. Thus, there is confusion in nomenclature. Genes originally designated neua, neur, neut, tru(628) may be mtr alleles. mtr was initially called mt (602).	IVR	B