10-15672661-CGT-ACG

Variant names:

• chr10-15672661-CGT-ACG
• NM_003638.3:c.763_765delACGinsCGT
• ITGA8 p.Thr255Arg

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 1P and 0B. PP3

The NM_003638.3(ITGA8):​c.763_765delACGinsCGT​(p.Thr255Arg) variant causes a missense change involving the alteration of a conserved nucleotide. 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. T255M) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: ITGA8 NM_003638.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.87
• Publications: 0 publications found

Genes affected

ITGA8 (HGNC:6144): (integrin subunit alpha 8) Integrins are heterodimeric transmembrane receptor proteins that mediate numerous cellular processes including cell adhesion, cytoskeletal rearrangement, and activation of cell signaling pathways. Integrins are composed of alpha and beta subunits. This gene encodes the alpha 8 subunit of the heterodimeric integrin alpha8beta1 protein. The encoded protein is a single-pass type 1 membrane protein that contains multiple FG-GAP repeats. This repeat is predicted to fold into a beta propeller structure. This gene regulates the recruitment of mesenchymal cells into epithelial structures, mediates cell-cell interactions, and regulates neurite outgrowth of sensory and motor neurons. The integrin alpha8beta1 protein thus plays an important role in wound-healing and organogenesis. Mutations in this gene have been associated with renal hypodysplasia/aplasia-1 (RHDA1) and with several animal models of chronic kidney disease. Alternate splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Apr 2014]

ITGA8 Gene-Disease associations (from GenCC):

• renal hypodysplasia/aplasia 1

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• bilateral renal agenesis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003638.3. 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
	ITGA8	NM_003638.3	MANE Select	c.763_765delACGinsCGT	p.Thr255Arg	missense	N/A	NP_003629.2	P53708
	ITGA8	NM_001291494.2		c.763_765delACGinsCGT	p.Thr255Arg	missense	N/A	NP_001278423.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITGA8	ENST00000378076.4	TSL:1 MANE Select	c.763_765delACGinsCGT	p.Thr255Arg	missense	N/A	ENSP00000367316.3	P53708
	ITGA8	ENST00000882526.1		c.763_765delACGinsCGT	p.Thr255Arg	missense	N/A	ENSP00000552585.1
	ITGA8	ENST00000967017.1		c.763_765delACGinsCGT	p.Thr255Arg	missense	N/A	ENSP00000637076.1

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.9

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: chr10-15714660;