18-70086694-TAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-TAAAAAAAAAAA

Position:

• chr18-70086694-TAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA-TAAAAAAAAAAA

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BS1

The NM_173630.4(RTTN):​c.4303-30_4303-11delTTTTTTTTTTTTTTTTTTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00138 in 486,862 control chromosomes in the GnomAD database, including 1 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000029 (0 hom., cov: 0)
  • Exomes 𝑓: 0.0016 (1 hom.)
• Consequence: RTTN NM_173630.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.23

Genes affected

RTTN (HGNC:18654): (rotatin) This gene encodes a large protein whose specific function is unknown. Absence of the orthologous protein in mouse results in embryonic lethality with deficient axial rotation, abnormal differentiation of the neural tube, and randomized looping of the heart tube during development. In human, mutations in this gene are associated with polymicrogyria with seizures. In human fibroblasts this protein localizes at the ciliary basal bodies. Given the intracellular localization of this protein and the phenotypic effects of mutations, this gene is suspected of playing a role in the maintenance of normal ciliary structure which in turn effects the developmental process of left-right organ specification, axial rotation, and perhaps notochord development. [provided by RefSeq, Jan 2013]

RTTN (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BS1: Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.00161 (672/418684) while in subpopulation EAS AF= 0.00299 (79/26402). AF 95% confidence interval is 0.00246. There are 1 homozygotes in gnomad4_exome. There are 369 alleles in male gnomad4_exome subpopulation. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RTTN	NM_173630.4	c.4303-30_4303-11delTTTTTTTTTTTTTTTTTTTT		intron_variant		ENST00000640769.2	NP_775901.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RTTN	ENST00000640769.2	c.4303-30_4303-11delTTTTTTTTTTTTTTTTTTTT		intron_variant		2	NM_173630.4	ENSP00000491507.1

Frequencies

GnomAD3 genomes AF: 0.0000293 AC: 2 AN: 68178 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.000136

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00161 AC: 672 AN: 418684 Hom.: 1 AF XY: 0.00163 AC XY: 369 AN XY: 225692

Gnomad4 AFR exome AF: 0.00145

Gnomad4 AMR exome AF: 0.00197

Gnomad4 ASJ exome AF: 0.00128

Gnomad4 EAS exome AF: 0.00299

Gnomad4 SAS exome AF: 0.00164

Gnomad4 FIN exome AF: 0.00138

Gnomad4 NFE exome AF: 0.00145

Gnomad4 OTH exome AF: 0.00193

GnomAD4 genome AF: 0.0000293 AC: 2 AN: 68178 Hom.: 0 Cov.: 0 AF XY: 0.0000331 AC XY: 1 AN XY: 30196

Gnomad4 AFR AF: 0.000136

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs531741265; hg19: chr18-67753930;