Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
POLG1BC0505599606POLGA    PEO    POLG    174763
POLG1BC0425719606POLGA    PEO    POLG    174763
POLG1NM_0026939606PEO    POLGA    POLG    174763
POLG1U930281422

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002