12-21537011-AA-TG

Variant names:

• chr12-21537011-AA-TG
• NM_021957.4:c.2054_2055delTTinsCA
• GYS2 p.Phe685Ser

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_021957.4(GYS2):​c.2054_2055delTTinsCA​(p.Phe685Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Synonymous variant affecting the same amino acid position (i.e. F685F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GYS2 NM_021957.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.97
• Publications: 0 publications found

Genes affected

GYS2 (HGNC:4707): (glycogen synthase 2) The protein encoded by this gene, liver glycogen synthase, catalyzes the rate-limiting step in the synthesis of glycogen - the transfer of a glucose molecule from UDP-glucose to a terminal branch of the glycogen molecule. Mutations in this gene cause glycogen storage disease type 0 (GSD-0) - a rare type of early childhood fasting hypoglycemia with decreased liver glycogen content. [provided by RefSeq, Dec 2009]

ENSG00000285854 (HGNC:):

SPX (HGNC:28139): (spexin hormone) The protein encoded by this gene is a hormone involved in modulation of cardiovascular and renal function. It has also been shown in rats to cause weight loss. Several transcript variants have been found for this gene. [provided by RefSeq, Feb 2016]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021957.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GYS2	NM_021957.4	MANE Select	c.2054_2055delTTinsCA	p.Phe685Ser	missense	N/A	NP_068776.2	P54840

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GYS2	ENST00000261195.3	TSL:1 MANE Select	c.2054_2055delTTinsCA	p.Phe685Ser	missense	N/A	ENSP00000261195.2	P54840
	ENSG00000285854	ENST00000647960.1		n.*2056_*2057delTTinsCA		non_coding_transcript_exon	Exon 23 of 23	ENSP00000497202.1	A0A3B3IS95
	ENSG00000285854	ENST00000647960.1		n.*2056_*2057delTTinsCA		3_prime_UTR	Exon 23 of 23	ENSP00000497202.1	A0A3B3IS95

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		5.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr12-21689945;