4-55396206-CA-GG

Position:

• chr4-55396206-CA-GG

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_018475.5(TMEM165):​c.17_18delinsGG​(p.Pro6Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. P6P) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TMEM165 NM_018475.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.111

Genes affected

TMEM165 (HGNC:30760): (transmembrane protein 165) This gene encodes a predicted transmembrane protein with a perinuclear Golgi-like distribution in fibroblasts. Mutations in this gene are associated with the autosomal recessive disorder congenital disorder of glycosylation, type IIk. Knockdown of this gene's expression causes decreased sialylation in HEK cells and suggests this gene plays a role in terminal Golgi glycosylation. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TMEM165	NM_018475.5	c.17_18delinsGG	p.Pro6Arg	missense_variant	1/6	ENST00000381334.10	NP_060945.2
TMEM165	XM_011534394.4	c.17_18delinsGG	p.Pro6Arg	missense_variant	1/6		XP_011532696.1
TMEM165	XM_017008412.2	c.-429_-428delinsGG		5_prime_UTR_variant	1/8		XP_016863901.1
TMEM165	NR_073070.2	n.250_251delinsGG		non_coding_transcript_exon_variant	1/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TMEM165	ENST00000381334.10	c.17_18delinsGG	p.Pro6Arg	missense_variant	1/6	1	NM_018475.5	ENSP00000370736	P1
TMEM165	ENST00000506198.5	c.17_18delinsGG	p.Pro6Arg	missense_variant	1/3	2		ENSP00000425449
TMEM165	ENST00000508404.5	c.17_18delinsGG	p.Pro6Arg	missense_variant, NMD_transcript_variant	1/7	2		ENSP00000422639
TMEM165	ENST00000514070.1			upstream_gene_variant		2

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

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

TMEM165-congenital disorder of glycosylation Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 22, 2022

Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals affected with TMEM165-related conditions. Information on the frequency of this variant in the gnomAD database is not available, as this variant may be reported differently in the database. This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 6 of the TMEM165 protein (p.Pro6Arg). -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr4-56262373;