chr11-61300822-A-G

Position:

• chr11-61300822-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001923.5(DDB1):​c.3326T>C​(p.Val1109Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: DDB1 NM_001923.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.81

Genes affected

DDB1 (HGNC:2717): (damage specific DNA binding protein 1) The protein encoded by this gene is the large subunit (p127) of the heterodimeric DNA damage-binding (DDB) complex while another protein (p48) forms the small subunit. This protein complex functions in nucleotide-excision repair and binds to DNA following UV damage. Defective activity of this complex causes the repair defect in patients with xeroderma pigmentosum complementation group E (XPE) - an autosomal recessive disorder characterized by photosensitivity and early onset of carcinomas. However, it remains for mutation analysis to demonstrate whether the defect in XPE patients is in this gene or the gene encoding the small subunit. In addition, Best vitelliform mascular dystrophy is mapped to the same region as this gene on 11q, but no sequence alternations of this gene are demonstrated in Best disease patients. The protein encoded by this gene also functions as an adaptor molecule for the cullin 4 (CUL4) ubiquitin E3 ligase complex by facilitating the binding of substrates to this complex and the ubiquitination of proteins. [provided by RefSeq, May 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), DDB1. . Gene score misZ 4.8864 (greater than the threshold 3.09). Trascript score misZ 6.4521 (greater than threshold 3.09). GenCC has associacion of gene with White-Kernohan syndrome.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DDB1	NM_001923.5	c.3326T>C	p.Val1109Ala	missense_variant	26/27	ENST00000301764.12	NP_001914.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DDB1	ENST00000301764.12	c.3326T>C	p.Val1109Ala	missense_variant	26/27	1	NM_001923.5	ENSP00000301764	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 14, 2023

The c.3326T>C (p.V1109A) alteration is located in exon 26 (coding exon 26) of the DDB1 gene. This alteration results from a T to C substitution at nucleotide position 3326, causing the valine (V) at amino acid position 1109 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Benign	22
DANN	Uncertain	0.97
DEOGEN2	Benign	0.11	T
Eigen	Benign	-0.18
Eigen_PC	Benign	0.093
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.040	D
MetaRNN	Uncertain	0.43	T
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-0.16	N
REVEL	Uncertain	0.34
Sift	Benign	0.68	T
Sift4G	Benign	0.69	T
Polyphen		0.0	B
Vest4		0.66
MutPred		0.43		Gain of disorder (P = 0.0803);
MVP		0.86
MPC		1.6
ClinPred		0.70	D
GERP RS		5.8
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.8
Varity_R		0.20
gMVP		0.87

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr11-61068294; COSMIC: COSV100074398; COSMIC: COSV100074398;