Variant 2-165901914-G-GA details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP6_Very_StrongBS1BS2

The NM_024753.5(TTC21B):c.2569-5dupT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00217 in 1,600,870 control chromosomes in the GnomAD database, including 78 homozygotes. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.012 ( 37 hom., cov: 32)

Exomes 𝑓: 0.0011 ( 41 hom. )

Consequence

TTC21B
NM_024753.5 splice_region, intron

Scores

Not classified

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 0.346

Variant links:

Genes affected

TTC21B (HGNC:25660): (tetratricopeptide repeat domain 21B) This gene encodes a member of TTC21 family, containing several tetratricopeptide repeat (TPR) domains. This protein is localized to the cilium axoneme, and may play a role in retrograde intraflagellar transport in cilia. Mutations in this gene are associated with various ciliopathies, nephronophthisis 12, and asphyxiating thoracic dystrophy 4. [provided by RefSeq, Oct 2011]

TTC21B links:

TTC21B (HGNC:):

TTC21B links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -16 ACMG points.

BP6

Variant 2-165901914-G-GA is Benign according to our data. Variant chr2-165901914-G-GA is described in ClinVar as [Likely_benign]. Clinvar id is 195530.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0122 (1799/147598) while in subpopulation AFR AF= 0.0427 (1704/39890). AF 95% confidence interval is 0.041. There are 37 homozygotes in gnomad4. There are 824 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 37 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTC21B	NM_024753.5 linkuse as main transcript	c.2569-5dupT		splice_region_variant, intron_variant		ENST00000243344.8	NP_079029.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTC21B	ENST00000243344.8 linkuse as main transcript	c.2569-5dupT		splice_region_variant, intron_variant		1	NM_024753.5	ENSP00000243344.7		Q7Z4L5-1

Frequencies

GnomAD3 genomes

AF:

0.0122

AC:

1797

AN:

147484

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0428

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00515

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00329

Gnomad NFE

AF:

0.0000598

Gnomad OTH

AF:

0.00691

GnomAD4 exome

AF:

0.00115

AC:

1669

AN:

1453272

Hom.:

Cov.:

AF XY:

0.000975

AC XY:

705

AN XY:

723106

show subpopulations

Gnomad4 AFR exome

AF:

0.0400

Gnomad4 AMR exome

AF:

0.00269

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000510

Gnomad4 SAS exome

AF:

0.0000703

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000587

Gnomad4 OTH exome

AF:

0.00248

GnomAD4 genome

AF:

0.0122

AC:

1799

AN:

147598

Hom.:

Cov.:

AF XY:

0.0115

AC XY:

824

AN XY:

71746

show subpopulations

Gnomad4 AFR

AF:

0.0427

Gnomad4 AMR

AF:

0.00514

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000598

Gnomad4 OTH

AF:

0.00684

Alfa

AF:

0.00582

Hom.:

Bravo

AF:

0.0137

Asia WGS

AF:

0.00173

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Sep 15, 2014	- -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Jeune thoracic dystrophy;C0687120:Nephronophthisis

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 25, 2024

- -

not provided

Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

May 31, 2018

- -

Jeune thoracic dystrophy

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Familial aplasia of the vermis

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Connective tissue disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Aug 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over