1-243489095-G-T

Variant names:

• chr1-243489095-G-T
• rs191821211
• NM_006642.5:c.2067G>T

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_006642.5(SDCCAG8):​c.2067G>T​(p.Leu689Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L689L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SDCCAG8 NM_006642.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.63
• Publications: 1 publications found

Genes affected

SDCCAG8 (HGNC:10671): (SHH signaling and ciliogenesis regulator SDCCAG8) This gene encodes a centrosome associated protein. This protein may be involved in organizing the centrosome during interphase and mitosis. Mutations in this gene are associated with retinal-renal ciliopathy. [provided by RefSeq, Oct 2010]

AKT3 (HGNC:393): (AKT serine/threonine kinase 3) The protein encoded by this gene is a member of the AKT, also called PKB, serine/threonine protein kinase family. AKT kinases are known to be regulators of cell signaling in response to insulin and growth factors. They are involved in a wide variety of biological processes including cell proliferation, differentiation, apoptosis, tumorigenesis, as well as glycogen synthesis and glucose uptake. This kinase has been shown to be stimulated by platelet-derived growth factor (PDGF), insulin, and insulin-like growth factor 1 (IGF1). Alternatively splice transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Jul 2008]

AKT3 Gene-Disease associations (from GenCC):

• overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 1

  Inheritance: AD Classification: STRONG Submitted by: G2P
• megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome 2

  Inheritance: AD Classification: STRONG Submitted by: Illumina, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• microcephaly

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.39).
• BP7: Synonymous conserved (PhyloP=2.63 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006642.5. 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
	SDCCAG8	NM_006642.5	MANE Select	c.2067G>T	p.Leu689Leu	synonymous	Exon 17 of 18	NP_006633.1	Q86SQ7-1
	SDCCAG8	NM_001350248.2		c.2163G>T	p.Leu721Leu	synonymous	Exon 18 of 19	NP_001337177.1
	SDCCAG8	NM_001350249.2		c.1773G>T	p.Leu591Leu	synonymous	Exon 17 of 18	NP_001337178.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDCCAG8	ENST00000366541.8	TSL:1 MANE Select	c.2067G>T	p.Leu689Leu	synonymous	Exon 17 of 18	ENSP00000355499.3	Q86SQ7-1
	SDCCAG8	ENST00000435549.1	TSL:1	c.1170G>T	p.Leu390Leu	synonymous	Exon 10 of 11	ENSP00000410200.1	A0A0C4DG71
	AKT3	ENST00000336199.9	TSL:1	c.*7-645C>A		intron	N/A	ENSP00000336943.5	Q9Y243-2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.39
CADD	Benign	6.6
DANN	Benign	0.85
PhyloP100		2.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=95/5	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs191821211; hg19: chr1-243652397;