7-40459197-C-G

Variant names:

• chr7-40459197-C-G
• rs137852860
• NM_001193313.2:c.985C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001193313.2(SUGCT):​c.985C>G​(p.Arg329Gly) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000701 in 1,426,210 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R329W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: SUGCT NM_001193313.2 missense, splice_region
• Scores: Splicing: ADA: 0.0006346
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.756
• Publications: 0 publications found

Genes affected

SUGCT (HGNC:16001): (succinyl-CoA:glutarate-CoA transferase) This gene encodes a protein that is similar to members of the CaiB/baiF CoA-transferase protein family. Mutations in this gene are associated with glutaric aciduria type III. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Jul 2010]

SUGCT Gene-Disease associations (from GenCC):

• glutaric acidemia type 3

  Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: PanelApp Australia, Orphanet, Ambry Genetics, ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001193313.2. 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
	SUGCT	NM_001193313.2	MANE Select	c.985C>G	p.Arg329Gly	missense splice_region	Exon 11 of 14	NP_001180242.2	Q9HAC7-1
	SUGCT	NM_001193311.2		c.985C>G	p.Arg329Gly	missense splice_region	Exon 11 of 15	NP_001180240.2	Q9HAC7-3
	SUGCT	NM_024728.3		c.874C>G	p.Arg292Gly	missense splice_region	Exon 11 of 15	NP_079004.2	Q9HAC7-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SUGCT	ENST00000335693.9	TSL:1 MANE Select	c.985C>G	p.Arg329Gly	missense splice_region	Exon 11 of 14	ENSP00000338475.5	Q9HAC7-1
	SUGCT	ENST00000628514.3	TSL:1	c.985C>G	p.Arg329Gly	missense splice_region	Exon 11 of 15	ENSP00000486291.2	Q9HAC7-3
	SUGCT	ENST00000416370.2	TSL:1	c.985C>G	p.Arg329Gly	missense splice_region	Exon 11 of 13	ENSP00000393032.2	H0Y4N1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.01e-7 AC: 1 AN: 1426210 Hom.: 0 Cov.: 24 AF XY: 0.00000141 AC XY: 1 AN XY: 711204

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32734

American (AMR) AF: 0.00 AC: 0 AN: 44454

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25852

East Asian (EAS) AF: 0.00 AC: 0 AN: 39368

South Asian (SAS) AF: 0.00 AC: 0 AN: 84658

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51916

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5466

European-Non Finnish (NFE) AF: 9.24e-7 AC: 1 AN: 1082570

Other (OTH) AF: 0.00 AC: 0 AN: 59192

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.49
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Benign	18
DANN	Uncertain	1.0
DEOGEN2	Benign	0.17	T
Eigen	Benign	-0.095
Eigen_PC	Benign	-0.17
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.86	D
M_CAP	Benign	0.072	D
MetaRNN	Uncertain	0.69	D
MetaSVM	Benign	-0.40	T
MutationAssessor	Uncertain	2.6	M
PhyloP100		0.76
PROVEAN	Uncertain	-3.2	D
REVEL	Uncertain	0.54
Sift	Benign	0.032	D
Sift4G	Benign	0.16	T
Polyphen		0.95	P
Vest4		0.72
MutPred		0.55		Loss of stability (P = 0.025)
MVP		0.68
ClinPred		0.97	D
GERP RS		2.5
Varity_R		0.84
gMVP		0.66
Mutation Taster		=64/36	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00063
dbscSNV1_RF	Benign	0.020
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs137852860; hg19: chr7-40498796;